checkpatch.pl

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
#
# (c) 2001, Dave Jones. (the file handling bit)
# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
# (c) 2010-2018 Joe Perches <joe@perches.com>

use strict;
use warnings;
use POSIX;
use File::Basename;
use Cwd 'abs_path';
use Term::ANSIColor qw(:constants);
use Encode qw(decode encode);

my $P = $0;
my $D = dirname(abs_path($P));

my $V = '0.32';

use Getopt::Long qw(:config no_auto_abbrev);

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
my $tst_only;
my $emacs = 0;
my $terse = 0;
my $showfile = 0;
my $file = 0;
my $git = 0;
my %git_commits = ();
my $check = 0;
my $check_orig = 0;
my $summary = 1;
my $mailback = 0;
my $summary_file = 0;
my $show_types = 0;
my $list_types = 0;
my $fix = 0;
my $fix_inplace = 0;
my $root;
my %debug;
my %camelcase = ();
my %use_type = ();
my @use = ();
my %ignore_type = ();
my @ignore = ();
my $help = 0;
my $configuration_file = ".checkpatch.conf";
my $max_line_length = 80;
my $ignore_perl_version = 0;
my $minimum_perl_version = 5.10.0;
my $min_conf_desc_length = 4;
my $spelling_file = "$D/spelling.txt";
my $codespell = 0;
my $codespellfile = "/usr/share/codespell/dictionary.txt";
my $conststructsfile = "$D/const_structs.checkpatch";
my $typedefsfile = "";
my $color = "auto";
my $allow_c99_comments = 1;

sub help {
	my ($exitcode) = @_;

	print << "EOM";
Usage: $P [OPTION]... [FILE]...
Version: $V

Options:
  -q, --quiet                quiet
  --no-tree                  run without a kernel tree
  --no-signoff               do not check for 'Signed-off-by' line
  --patch                    treat FILE as patchfile (default)
  --emacs                    emacs compile window format
  --terse                    one line per report
  --showfile                 emit diffed file position, not input file position
  -g, --git                  treat FILE as a single commit or git revision range
                             single git commit with:
                               <rev>
                               <rev>^
                               <rev>~n
                             multiple git commits with:
                               <rev1>..<rev2>
                               <rev1>...<rev2>
                               <rev>-<count>
                             git merges are ignored
  -f, --file                 treat FILE as regular source file
  --subjective, --strict     enable more subjective tests
  --list-types               list the possible message types
  --types TYPE(,TYPE2...)    show only these comma separated message types
  --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  --show-types               show the specific message type in the output
  --max-line-length=n        set the maximum line length, if exceeded, warn
  --min-conf-desc-length=n   set the min description length, if shorter, warn
  --root=PATH                PATH to the kernel tree root
  --no-summary               suppress the per-file summary
  --mailback                 only produce a report in case of warnings/errors
  --summary-file             include the filename in summary
  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
                             'values', 'possible', 'type', and 'attr' (default
                             is all off)
  --test-only=WORD           report only warnings/errors containing WORD
                             literally
  --fix                      EXPERIMENTAL - may create horrible results
                             If correctable single-line errors exist, create
                             "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
                             with potential errors corrected to the preferred
                             checkpatch style
  --fix-inplace              EXPERIMENTAL - may create horrible results
                             Is the same as --fix, but overwrites the input
                             file.  It's your fault if there's no backup or git
  --ignore-perl-version      override checking of perl version.  expect
                             runtime errors.
  --codespell                Use the codespell dictionary for spelling/typos
                             (default:/usr/share/codespell/dictionary.txt)
  --codespellfile            Use this codespell dictionary
  --typedefsfile             Read additional types from this file
  --color[=WHEN]             Use colors 'always', 'never', or only when output
                             is a terminal ('auto'). Default is 'auto'.
  -h, --help, --version      display this help and exit

When FILE is - read standard input.
EOM

	exit($exitcode);
}

sub uniq {
	my %seen;
	return grep { !$seen{$_}++ } @_;
}

sub list_types {
	my ($exitcode) = @_;

	my $count = 0;

	local $/ = undef;

	open(my $script, '<', abs_path($P)) or
	    die "$P: Can't read '$P' $!\n";

	my $text = <$script>;
	close($script);

	my @types = ();
	# Also catch when type or level is passed through a variable
	for ($text =~ /(?:(?:\bCHK|\bWARN|\bERROR|&\{\$msg_level})\s*\(|\$msg_type\s*=)\s*"([^"]+)"/g) {
		push (@types, $_);
	}
	@types = sort(uniq(@types));
	print("#\tMessage type\n\n");
	foreach my $type (@types) {
		print(++$count . "\t" . $type . "\n");
	}

	exit($exitcode);
}

my $conf = which_conf($configuration_file);
if (-f $conf) {
	my @conf_args;
	open(my $conffile, '<', "$conf")
	    or warn "$P: Can't find a readable $configuration_file file $!\n";

	while (<$conffile>) {
		my $line = $_;

		$line =~ s/\s*\n?$//g;
		$line =~ s/^\s*//g;
		$line =~ s/\s+/ /g;

		next if ($line =~ m/^\s*#/);
		next if ($line =~ m/^\s*$/);

		my @words = split(" ", $line);
		foreach my $word (@words) {
			last if ($word =~ m/^#/);
			push (@conf_args, $word);
		}
	}
	close($conffile);
	unshift(@ARGV, @conf_args) if @conf_args;
}

# Perl's Getopt::Long allows options to take optional arguments after a space.
# Prevent --color by itself from consuming other arguments
foreach (@ARGV) {
	if ($_ eq "--color" || $_ eq "-color") {
		$_ = "--color=$color";
	}
}

GetOptions(
	'q|quiet+'	=> \$quiet,
	'tree!'		=> \$tree,
	'signoff!'	=> \$chk_signoff,
	'patch!'	=> \$chk_patch,
	'emacs!'	=> \$emacs,
	'terse!'	=> \$terse,
	'showfile!'	=> \$showfile,
	'f|file!'	=> \$file,
	'g|git!'	=> \$git,
	'subjective!'	=> \$check,
	'strict!'	=> \$check,
	'ignore=s'	=> \@ignore,
	'types=s'	=> \@use,
	'show-types!'	=> \$show_types,
	'list-types!'	=> \$list_types,
	'max-line-length=i' => \$max_line_length,
	'min-conf-desc-length=i' => \$min_conf_desc_length,
	'root=s'	=> \$root,
	'summary!'	=> \$summary,
	'mailback!'	=> \$mailback,
	'summary-file!'	=> \$summary_file,
	'fix!'		=> \$fix,
	'fix-inplace!'	=> \$fix_inplace,
	'ignore-perl-version!' => \$ignore_perl_version,
	'debug=s'	=> \%debug,
	'test-only=s'	=> \$tst_only,
	'codespell!'	=> \$codespell,
	'codespellfile=s'	=> \$codespellfile,
	'typedefsfile=s'	=> \$typedefsfile,
	'color=s'	=> \$color,
	'no-color'	=> \$color,	#keep old behaviors of -nocolor
	'nocolor'	=> \$color,	#keep old behaviors of -nocolor
	'h|help'	=> \$help,
	'version'	=> \$help
) or help(1);

help(0) if ($help);

list_types(0) if ($list_types);

$fix = 1 if ($fix_inplace);
$check_orig = $check;

my $exit = 0;

my $perl_version_ok = 1;
if ($^V && $^V lt $minimum_perl_version) {
	$perl_version_ok = 0;
	printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
	exit(1) if (!$ignore_perl_version);
}

#if no filenames are given, push '-' to read patch from stdin
if ($#ARGV < 0) {
	push(@ARGV, '-');
}

if ($color =~ /^[01]$/) {
	$color = !$color;
} elsif ($color =~ /^always$/i) {
	$color = 1;
} elsif ($color =~ /^never$/i) {
	$color = 0;
} elsif ($color =~ /^auto$/i) {
	$color = (-t STDOUT);
} else {
	die "Invalid color mode: $color\n";
}

sub hash_save_array_words {
	my ($hashRef, $arrayRef) = @_;

	my @array = split(/,/, join(',', @$arrayRef));
	foreach my $word (@array) {
		$word =~ s/\s*\n?$//g;
		$word =~ s/^\s*//g;
		$word =~ s/\s+/ /g;
		$word =~ tr/[a-z]/[A-Z]/;

		next if ($word =~ m/^\s*#/);
		next if ($word =~ m/^\s*$/);

		$hashRef->{$word}++;
	}
}

sub hash_show_words {
	my ($hashRef, $prefix) = @_;

	if (keys %$hashRef) {
		print "\nNOTE: $prefix message types:";
		foreach my $word (sort keys %$hashRef) {
			print " $word";
		}
		print "\n";
	}
}

hash_save_array_words(\%ignore_type, \@ignore);
hash_save_array_words(\%use_type, \@use);

my $dbg_values = 0;
my $dbg_possible = 0;
my $dbg_type = 0;
my $dbg_attr = 0;
for my $key (keys %debug) {
	## no critic
	eval "\${dbg_$key} = '$debug{$key}';";
	die "$@" if ($@);
}

my $rpt_cleaners = 0;

if ($terse) {
	$emacs = 1;
	$quiet++;
}

if ($tree) {
	if (defined $root) {
		if (!top_of_kernel_tree($root)) {
			die "$P: $root: --root does not point at a valid tree\n";
		}
	} else {
		if (top_of_kernel_tree('.')) {
			$root = '.';
		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
						top_of_kernel_tree($1)) {
			$root = $1;
		}
	}

	if (!defined $root) {
		print "Must be run from the top-level dir. of a kernel tree\n";
		exit(2);
	}
}

my $emitted_corrupt = 0;

our $Ident	= qr{
			[A-Za-z_][A-Za-z\d_]*
			(?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
		}x;
our $Storage	= qr{extern|static|asmlinkage};
our $Sparse	= qr{
			__user|
			__kernel|
			__force|
			__iomem|
			__must_check|
			__kprobes|
			__ref|
			__refconst|
			__refdata|
			__rcu|
			__private
		}x;
our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};

# Notes to $Attribute:
# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
our $Attribute	= qr{
			const|
			__percpu|
			__nocast|
			__safe|
			__bitwise|
			__packed__|
			__packed2__|
			__naked|
			__maybe_unused|
			__always_unused|
			__noreturn|
			__used|
			__cold|
			__pure|
			__noclone|
			__deprecated|
			__read_mostly|
			__ro_after_init|
			__kprobes|
			$InitAttribute|
			____cacheline_aligned|
			____cacheline_aligned_in_smp|
			____cacheline_internodealigned_in_smp|
			__weak
		  }x;
our $Modifier;
our $Inline	= qr{inline|__always_inline|noinline|__inline|__inline__};
our $Member	= qr{->$Ident|\.$Ident|\[[^]]*\]};
our $Lval	= qr{$Ident(?:$Member)*};

our $Int_type	= qr{(?i)llu|ull|ll|lu|ul|l|u};
our $Binary	= qr{(?i)0b[01]+$Int_type?};
our $Hex	= qr{(?i)0x[0-9a-f]+$Int_type?};
our $Int	= qr{[0-9]+$Int_type?};
our $Octal	= qr{0[0-7]+$Int_type?};
our $String	= qr{"[X\t]*"};
our $Float_hex	= qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
our $Float_dec	= qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
our $Float_int	= qr{(?i)[0-9]+e-?[0-9]+[fl]?};
our $Float	= qr{$Float_hex|$Float_dec|$Float_int};
our $Constant	= qr{$Float|$Binary|$Octal|$Hex|$Int};
our $Assignment	= qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
our $Arithmetic = qr{\+|-|\*|\/|%};
our $Operators	= qr{
			<=|>=|==|!=|
			=>|->|<<|>>|<|>|!|~|
			&&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
		  }x;

our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;

our $BasicType;
our $NonptrType;
our $NonptrTypeMisordered;
our $NonptrTypeWithAttr;
our $Type;
our $TypeMisordered;
our $Declare;
our $DeclareMisordered;

our $NON_ASCII_UTF8	= qr{
	[\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
	|  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
	| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
	|  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
	|  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
	| [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
	|  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
}x;

our $UTF8	= qr{
	[\x09\x0A\x0D\x20-\x7E]              # ASCII
	| $NON_ASCII_UTF8
}x;

our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
our $typeOtherOSTypedefs = qr{(?x:
	u_(?:char|short|int|long) |          # bsd
	u(?:nchar|short|int|long)            # sysv
)};
our $typeKernelTypedefs = qr{(?x:
	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
	atomic_t
)};
our $typeTypedefs = qr{(?x:
	$typeC99Typedefs\b|
	$typeOtherOSTypedefs\b|
	$typeKernelTypedefs\b
)};

our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};

our $logFunctions = qr{(?x:
	printk(?:_ratelimited|_once|_deferred_once|_deferred|)|
	(?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
	TP_printk|
	WARN(?:_RATELIMIT|_ONCE|)|
	panic|
	MODULE_[A-Z_]+|
	seq_vprintf|seq_printf|seq_puts
)};

our $signature_tags = qr{(?xi:
	Signed-off-by:|
	Acked-by:|
	Tested-by:|
	Reviewed-by:|
	Reported-by:|
	Suggested-by:|
	To:|
	Cc:
)};

our @typeListMisordered = (
	qr{char\s+(?:un)?signed},
	qr{int\s+(?:(?:un)?signed\s+)?short\s},
	qr{int\s+short(?:\s+(?:un)?signed)},
	qr{short\s+int(?:\s+(?:un)?signed)},
	qr{(?:un)?signed\s+int\s+short},
	qr{short\s+(?:un)?signed},
	qr{long\s+int\s+(?:un)?signed},
	qr{int\s+long\s+(?:un)?signed},
	qr{long\s+(?:un)?signed\s+int},
	qr{int\s+(?:un)?signed\s+long},
	qr{int\s+(?:un)?signed},
	qr{int\s+long\s+long\s+(?:un)?signed},
	qr{long\s+long\s+int\s+(?:un)?signed},
	qr{long\s+long\s+(?:un)?signed\s+int},
	qr{long\s+long\s+(?:un)?signed},
	qr{long\s+(?:un)?signed},
);

our @typeList = (
	qr{void},
	qr{(?:(?:un)?signed\s+)?char},
	qr{(?:(?:un)?signed\s+)?short\s+int},
	qr{(?:(?:un)?signed\s+)?short},
	qr{(?:(?:un)?signed\s+)?int},
	qr{(?:(?:un)?signed\s+)?long\s+int},
	qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
	qr{(?:(?:un)?signed\s+)?long\s+long},
	qr{(?:(?:un)?signed\s+)?long},
	qr{(?:un)?signed},
	qr{float},
	qr{double},
	qr{bool},
	qr{struct\s+$Ident},
	qr{union\s+$Ident},
	qr{enum\s+$Ident},
	qr{${Ident}_t},
	qr{${Ident}_handler},
	qr{${Ident}_handler_fn},
	@typeListMisordered,
);

our $C90_int_types = qr{(?x:
	long\s+long\s+int\s+(?:un)?signed|
	long\s+long\s+(?:un)?signed\s+int|
	long\s+long\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?long\s+long\s+int|
	(?:(?:un)?signed\s+)?long\s+long|
	int\s+long\s+long\s+(?:un)?signed|
	int\s+(?:(?:un)?signed\s+)?long\s+long|

	long\s+int\s+(?:un)?signed|
	long\s+(?:un)?signed\s+int|
	long\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?long\s+int|
	(?:(?:un)?signed\s+)?long|
	int\s+long\s+(?:un)?signed|
	int\s+(?:(?:un)?signed\s+)?long|

	int\s+(?:un)?signed|
	(?:(?:un)?signed\s+)?int
)};

our @typeListFile = ();
our @typeListWithAttr = (
	@typeList,
	qr{struct\s+$InitAttribute\s+$Ident},
	qr{union\s+$InitAttribute\s+$Ident},
);

our @modifierList = (
	qr{fastcall},
);
our @modifierListFile = ();

our @mode_permission_funcs = (
	["module_param", 3],
	["module_param_(?:array|named|string)", 4],
	["module_param_array_named", 5],
	["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
	["proc_create(?:_data|)", 2],
	["(?:CLASS|DEVICE|SENSOR|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2],
	["IIO_DEV_ATTR_[A-Z_]+", 1],
	["SENSOR_(?:DEVICE_|)ATTR_2", 2],
	["SENSOR_TEMPLATE(?:_2|)", 3],
	["__ATTR", 2],
);

#Create a search pattern for all these functions to speed up a loop below
our $mode_perms_search = "";
foreach my $entry (@mode_permission_funcs) {
	$mode_perms_search .= '|' if ($mode_perms_search ne "");
	$mode_perms_search .= $entry->[0];
}
$mode_perms_search = "(?:${mode_perms_search})";

our $mode_perms_world_writable = qr{
	S_IWUGO		|
	S_IWOTH		|
	S_IRWXUGO	|
	S_IALLUGO	|
	0[0-7][0-7][2367]
}x;

our %mode_permission_string_types = (
	"S_IRWXU" => 0700,
	"S_IRUSR" => 0400,
	"S_IWUSR" => 0200,
	"S_IXUSR" => 0100,
	"S_IRWXG" => 0070,
	"S_IRGRP" => 0040,
	"S_IWGRP" => 0020,
	"S_IXGRP" => 0010,
	"S_IRWXO" => 0007,
	"S_IROTH" => 0004,
	"S_IWOTH" => 0002,
	"S_IXOTH" => 0001,
	"S_IRWXUGO" => 0777,
	"S_IRUGO" => 0444,
	"S_IWUGO" => 0222,
	"S_IXUGO" => 0111,
);

#Create a search pattern for all these strings to speed up a loop below
our $mode_perms_string_search = "";
foreach my $entry (keys %mode_permission_string_types) {
	$mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
	$mode_perms_string_search .= $entry;
}
our $single_mode_perms_string_search = "(?:${mode_perms_string_search})";
our $multi_mode_perms_string_search = qr{
	${single_mode_perms_string_search}
	(?:\s*\|\s*${single_mode_perms_string_search})*
}x;

sub perms_to_octal {
	my ($string) = @_;

	return trim($string) if ($string =~ /^\s*0[0-7]{3,3}\s*$/);

	my $val = "";
	my $oval = "";
	my $to = 0;
	my $curpos = 0;
	my $lastpos = 0;
	while ($string =~ /\b(($single_mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) {
		$curpos = pos($string);
		my $match = $2;
		my $omatch = $1;
		last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos));
		$lastpos = $curpos;
		$to |= $mode_permission_string_types{$match};
		$val .= '\s*\|\s*' if ($val ne "");
		$val .= $match;
		$oval .= $omatch;
	}
	$oval =~ s/^\s*\|\s*//;
	$oval =~ s/\s*\|\s*$//;
	return sprintf("%04o", $to);
}

our $allowed_asm_includes = qr{(?x:
	irq|
	memory|
	time|
	reboot
)};
# memory.h: ARM has a custom one

# Load common spelling mistakes and build regular expression list.
my $misspellings;
my %spelling_fix;

if (open(my $spelling, '<', $spelling_file)) {
	while (<$spelling>) {
		my $line = $_;

		$line =~ s/\s*\n?$//g;
		$line =~ s/^\s*//g;

		next if ($line =~ m/^\s*#/);
		next if ($line =~ m/^\s*$/);

		my ($suspect, $fix) = split(/\|\|/, $line);

		$spelling_fix{$suspect} = $fix;
	}
	close($spelling);
} else {
	warn "No typos will be found - file '$spelling_file': $!\n";
}

if ($codespell) {
	if (open(my $spelling, '<', $codespellfile)) {
		while (<$spelling>) {
			my $line = $_;

			$line =~ s/\s*\n?$//g;
			$line =~ s/^\s*//g;

			next if ($line =~ m/^\s*#/);
			next if ($line =~ m/^\s*$/);
			next if ($line =~ m/, disabled/i);

			$line =~ s/,.*$//;

			my ($suspect, $fix) = split(/->/, $line);

			$spelling_fix{$suspect} = $fix;
		}
		close($spelling);
	} else {
		warn "No codespell typos will be found - file '$codespellfile': $!\n";
	}
}

$misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;

sub read_words {
	my ($wordsRef, $file) = @_;

	if (open(my $words, '<', $file)) {
		while (<$words>) {
			my $line = $_;

			$line =~ s/\s*\n?$//g;
			$line =~ s/^\s*//g;

			next if ($line =~ m/^\s*#/);
			next if ($line =~ m/^\s*$/);
			if ($line =~ /\s/) {
				print("$file: '$line' invalid - ignored\n");
				next;
			}

			$$wordsRef .= '|' if ($$wordsRef ne "");
			$$wordsRef .= $line;
		}
		close($file);
		return 1;
	}

	return 0;
}

my $const_structs = "";
read_words(\$const_structs, $conststructsfile)
    or warn "No structs that should be const will be found - file '$conststructsfile': $!\n";

my $typeOtherTypedefs = "";
if (length($typedefsfile)) {
	read_words(\$typeOtherTypedefs, $typedefsfile)
	    or warn "No additional types will be considered - file '$typedefsfile': $!\n";
}
$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");

sub build_types {
	my $mods = "(?x:  \n" . join("|\n  ", (@modifierList, @modifierListFile)) . "\n)";
	my $all = "(?x:  \n" . join("|\n  ", (@typeList, @typeListFile)) . "\n)";
	my $Misordered = "(?x:  \n" . join("|\n  ", @typeListMisordered) . "\n)";
	my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
	$Modifier	= qr{(?:$Attribute|$Sparse|$mods)};
	$BasicType	= qr{
				(?:$typeTypedefs\b)|
				(?:${all}\b)
		}x;
	$NonptrType	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:typeof|__typeof__)\s*\([^\)]*\)|
				(?:$typeTypedefs\b)|
				(?:${all}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$NonptrTypeMisordered	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:${Misordered}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$NonptrTypeWithAttr	= qr{
			(?:$Modifier\s+|const\s+)*
			(?:
				(?:typeof|__typeof__)\s*\([^\)]*\)|
				(?:$typeTypedefs\b)|
				(?:${allWithAttr}\b)
			)
			(?:\s+$Modifier|\s+const)*
		  }x;
	$Type	= qr{
			$NonptrType
			(?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
			(?:\s+$Inline|\s+$Modifier)*
		  }x;
	$TypeMisordered	= qr{
			$NonptrTypeMisordered
			(?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
			(?:\s+$Inline|\s+$Modifier)*
		  }x;
	$Declare	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
	$DeclareMisordered	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};
}
build_types();

our $Typecast	= qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};

# Using $balanced_parens, $LvalOrFunc, or $FuncArg
# requires at least perl version v5.10.0
# Any use must be runtime checked with $^V

our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
our $LvalOrFunc	= qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)};

our $declaration_macros = qr{(?x:
	(?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
	(?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
	(?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(|
	(?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(
)};

sub deparenthesize {
	my ($string) = @_;
	return "" if (!defined($string));

	while ($string =~ /^\s*\(.*\)\s*$/) {
		$string =~ s@^\s*\(\s*@@;
		$string =~ s@\s*\)\s*$@@;
	}

	$string =~ s@\s+@ @g;

	return $string;
}

sub seed_camelcase_file {
	my ($file) = @_;

	return if (!(-f $file));

	local $/;

	open(my $include_file, '<', "$file")
	    or warn "$P: Can't read '$file' $!\n";
	my $text = <$include_file>;
	close($include_file);

	my @lines = split('\n', $text);

	foreach my $line (@lines) {
		next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
		if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
			$camelcase{$1} = 1;
		} elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
			$camelcase{$1} = 1;
		} elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
			$camelcase{$1} = 1;
		}
	}
}

sub is_maintained_obsolete {
	my ($filename) = @_;

	return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));

	my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;

	return $status =~ /obsolete/i;
}

sub is_SPDX_License_valid {
	my ($license) = @_;

	return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py") || !(-e "$root/.git"));

	my $root_path = abs_path($root);
	my $status = `cd "$root_path"; echo "$license" | python scripts/spdxcheck.py -`;
	return 0 if ($status ne "");
	return 1;
}

my $camelcase_seeded = 0;
sub seed_camelcase_includes {
	return if ($camelcase_seeded);

	my $files;
	my $camelcase_cache = "";
	my @include_files = ();

	$camelcase_seeded = 1;

	if (-e ".git") {
		my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
		chomp $git_last_include_commit;
		$camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
	} else {
		my $last_mod_date = 0;
		$files = `find $root/include -name "*.h"`;
		@include_files = split('\n', $files);
		foreach my $file (@include_files) {
			my $date = POSIX::strftime("%Y%m%d%H%M",
						   localtime((stat $file)[9]));
			$last_mod_date = $date if ($last_mod_date < $date);
		}
		$camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
	}

	if ($camelcase_cache ne "" && -f $camelcase_cache) {
		open(my $camelcase_file, '<', "$camelcase_cache")
		    or warn "$P: Can't read '$camelcase_cache' $!\n";
		while (<$camelcase_file>) {
			chomp;
			$camelcase{$_} = 1;
		}
		close($camelcase_file);

		return;
	}

	if (-e ".git") {
		$files = `git ls-files "include/*.h"`;
		@include_files = split('\n', $files);
	}

	foreach my $file (@include_files) {
		seed_camelcase_file($file);
	}

	if ($camelcase_cache ne "") {
		unlink glob ".checkpatch-camelcase.*";
		open(my $camelcase_file, '>', "$camelcase_cache")
		    or warn "$P: Can't write '$camelcase_cache' $!\n";
		foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
			print $camelcase_file ("$_\n");
		}
		close($camelcase_file);
	}
}

sub git_commit_info {
	my ($commit, $id, $desc) = @_;

	return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));

	my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
	$output =~ s/^\s*//gm;
	my @lines = split("\n", $output);

	return ($id, $desc) if ($#lines < 0);

	if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
# Maybe one day convert this block of bash into something that returns
# all matching commit ids, but it's very slow...
#
#		echo "checking commits $1..."
#		git rev-list --remotes | grep -i "^$1" |
#		while read line ; do
#		    git log --format='%H %s' -1 $line |
#		    echo "commit $(cut -c 1-12,41-)"
#		done
	} elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
		$id = undef;
	} else {
		$id = substr($lines[0], 0, 12);
		$desc = substr($lines[0], 41);
	}

	return ($id, $desc);
}

$chk_signoff = 0 if ($file);

my @rawlines = ();
my @lines = ();
my @fixed = ();
my @fixed_inserted = ();
my @fixed_deleted = ();
my $fixlinenr = -1;

# If input is git commits, extract all commits from the commit expressions.
# For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
die "$P: No git repository found\n" if ($git && !-e ".git");

if ($git) {
	my @commits = ();
	foreach my $commit_expr (@ARGV) {
		my $git_range;
		if ($commit_expr =~ m/^(.*)-(\d+)$/) {
			$git_range = "-$2 $1";
		} elsif ($commit_expr =~ m/\.\./) {
			$git_range = "$commit_expr";
		} else {
			$git_range = "-1 $commit_expr";
		}
		my $lines = `git log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
		foreach my $line (split(/\n/, $lines)) {
			$line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
			next if (!defined($1) || !defined($2));
			my $sha1 = $1;
			my $subject = $2;
			unshift(@commits, $sha1);
			$git_commits{$sha1} = $subject;
		}
	}
	die "$P: no git commits after extraction!\n" if (@commits == 0);
	@ARGV = @commits;
}

my $vname;
for my $filename (@ARGV) {
	my $FILE;
	if ($git) {
		open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
			die "$P: $filename: git format-patch failed - $!\n";
	} elsif ($file) {
		open($FILE, '-|', "diff -u /dev/null $filename") ||
			die "$P: $filename: diff failed - $!\n";
	} elsif ($filename eq '-') {
		open($FILE, '<&STDIN');
	} else {
		open($FILE, '<', "$filename") ||
			die "$P: $filename: open failed - $!\n";
	}
	if ($filename eq '-') {
		$vname = 'Your patch';
	} elsif ($git) {
		$vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")';
	} else {
		$vname = $filename;
	}
	while (<$FILE>) {
		chomp;
		push(@rawlines, $_);
	}
	close($FILE);

	if ($#ARGV > 0 && $quiet == 0) {
		print '-' x length($vname) . "\n";
		print "$vname\n";
		print '-' x length($vname) . "\n";
	}

	if (!process($filename)) {
		$exit = 1;
	}
	@rawlines = ();
	@lines = ();
	@fixed = ();
	@fixed_inserted = ();
	@fixed_deleted = ();
	$fixlinenr = -1;
	@modifierListFile = ();
	@typeListFile = ();
	build_types();
}

if (!$quiet) {
	hash_show_words(\%use_type, "Used");
	hash_show_words(\%ignore_type, "Ignored");

	if (!$perl_version_ok) {
		print << "EOM"

NOTE: perl $^V is not modern enough to detect all possible issues.
      An upgrade to at least perl $minimum_perl_version is suggested.
EOM
	}
	if ($exit) {
		print << "EOM"

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
EOM
	}
}

exit($exit);

sub top_of_kernel_tree {
	my ($root) = @_;

	my @tree_check = (
		"COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
		"README", "Documentation", "arch", "include", "drivers",
		"fs", "init", "ipc", "kernel", "lib", "scripts",
	);

	foreach my $check (@tree_check) {
		if (! -e $root . '/' . $check) {
			return 0;
		}
	}
	return 1;
}

sub parse_email {
	my ($formatted_email) = @_;

	my $name = "";
	my $address = "";
	my $comment = "";

	if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
		$name = $1;
		$address = $2;
		$comment = $3 if defined $3;
	} elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
	} elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
		$address = $1;
		$comment = $2 if defined $2;
		$formatted_email =~ s/\Q$address\E.*$//;
		$name = $formatted_email;
		$name = trim($name);
		$name =~ s/^\"|\"$//g;
		# If there's a name left after stripping spaces and
		# leading quotes, and the address doesn't have both
		# leading and trailing angle brackets, the address
		# is invalid. ie:
		#   "joe smith joe@smith.com" bad
		#   "joe smith <joe@smith.com" bad
		if ($name ne "" && $address !~ /^<[^>]+>$/) {
			$name = "";
			$address = "";
			$comment = "";
		}
	}

	$name = trim($name);
	$name =~ s/^\"|\"$//g;
	$address = trim($address);
	$address =~ s/^\<|\>$//g;

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	return ($name, $address, $comment);
}

sub format_email {
	my ($name, $address) = @_;

	my $formatted_email;

	$name = trim($name);
	$name =~ s/^\"|\"$//g;
	$address = trim($address);

	if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
		$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
		$name = "\"$name\"";
	}

	if ("$name" eq "") {
		$formatted_email = "$address";
	} else {
		$formatted_email = "$name <$address>";
	}

	return $formatted_email;
}

sub which {
	my ($bin) = @_;

	foreach my $path (split(/:/, $ENV{PATH})) {
		if (-e "$path/$bin") {
			return "$path/$bin";
		}
	}

	return "";
}

sub which_conf {
	my ($conf) = @_;

	foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
		if (-e "$path/$conf") {
			return "$path/$conf";
		}
	}

	return "";
}

sub expand_tabs {
	my ($str) = @_;

	my $res = '';
	my $n = 0;
	for my $c (split(//, $str)) {
		if ($c eq "\t") {
			$res .= ' ';
			$n++;
			for (; ($n % 8) != 0; $n++) {
				$res .= ' ';
			}
			next;
		}
		$res .= $c;
		$n++;
	}

	return $res;
}
sub copy_spacing {
	(my $res = shift) =~ tr/\t/ /c;
	return $res;
}

sub line_stats {
	my ($line) = @_;

	# Drop the diff line leader and expand tabs
	$line =~ s/^.//;
	$line = expand_tabs($line);

	# Pick the indent from the front of the line.
	my ($white) = ($line =~ /^(\s*)/);

	return (length($line), length($white));
}

my $sanitise_quote = '';

sub sanitise_line_reset {
	my ($in_comment) = @_;

	if ($in_comment) {
		$sanitise_quote = '*/';
	} else {
		$sanitise_quote = '';
	}
}
sub sanitise_line {
	my ($line) = @_;

	my $res = '';
	my $l = '';

	my $qlen = 0;
	my $off = 0;
	my $c;

	# Always copy over the diff marker.
	$res = substr($line, 0, 1);

	for ($off = 1; $off < length($line); $off++) {
		$c = substr($line, $off, 1);

		# Comments we are whacking completely including the begin
		# and end, all to $;.
		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
			$sanitise_quote = '*/';

			substr($res, $off, 2, "$;$;");
			$off++;
			next;
		}
		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
			$sanitise_quote = '';
			substr($res, $off, 2, "$;$;");
			$off++;
			next;
		}
		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
			$sanitise_quote = '//';

			substr($res, $off, 2, $sanitise_quote);
			$off++;
			next;
		}

		# A \ in a string means ignore the next character.
		if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
		    $c eq "\\") {
			substr($res, $off, 2, 'XX');
			$off++;
			next;
		}
		# Regular quotes.
		if ($c eq "'" || $c eq '"') {
			if ($sanitise_quote eq '') {
				$sanitise_quote = $c;

				substr($res, $off, 1, $c);
				next;
			} elsif ($sanitise_quote eq $c) {
				$sanitise_quote = '';
			}
		}

		#print "c<$c> SQ<$sanitise_quote>\n";
		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
			substr($res, $off, 1, $;);
		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
			substr($res, $off, 1, $;);
		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
			substr($res, $off, 1, 'X');
		} else {
			substr($res, $off, 1, $c);
		}
	}

	if ($sanitise_quote eq '//') {
		$sanitise_quote = '';
	}

	# The pathname on a #include may be surrounded by '<' and '>'.
	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
		my $clean = 'X' x length($1);
		$res =~ s@\<.*\>@<$clean>@;

	# The whole of a #error is a string.
	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
		my $clean = 'X' x length($1);
		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
	}

	if ($allow_c99_comments && $res =~ m@(//.*$)@) {
		my $match = $1;
		$res =~ s/\Q$match\E/"$;" x length($match)/e;
	}

	return $res;
}

sub get_quoted_string {
	my ($line, $rawline) = @_;

	return "" if (!defined($line) || !defined($rawline));
	return "" if ($line !~ m/($String)/g);
	return substr($rawline, $-[0], $+[0] - $-[0]);
}

sub ctx_statement_block {
	my ($linenr, $remain, $off) = @_;
	my $line = $linenr - 1;
	my $blk = '';
	my $soff = $off;
	my $coff = $off - 1;
	my $coff_set = 0;

	my $loff = 0;

	my $type = '';
	my $level = 0;
	my @stack = ();
	my $p;
	my $c;
	my $len = 0;

	my $remainder;
	while (1) {
		@stack = (['', 0]) if ($#stack == -1);

		#warn "CSB: blk<$blk> remain<$remain>\n";
		# If we are about to drop off the end, pull in more
		# context.
		if ($off >= $len) {
			for (; $remain > 0; $line++) {
				last if (!defined $lines[$line]);
				next if ($lines[$line] =~ /^-/);
				$remain--;
				$loff = $len;
				$blk .= $lines[$line] . "\n";
				$len = length($blk);
				$line++;
				last;
			}
			# Bail if there is no further context.
			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
			if ($off >= $len) {
				last;
			}
			if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
				$level++;
				$type = '#';
			}
		}
		$p = $c;
		$c = substr($blk, $off, 1);
		$remainder = substr($blk, $off);

		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";

		# Handle nested #if/#else.
		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
			push(@stack, [ $type, $level ]);
		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
			($type, $level) = @{$stack[$#stack - 1]};
		} elsif ($remainder =~ /^#\s*endif\b/) {
			($type, $level) = @{pop(@stack)};
		}

		# Statement ends at the ';' or a close '}' at the
		# outermost level.
		if ($level == 0 && $c eq ';') {
			last;
		}

		# An else is really a conditional as long as its not else if
		if ($level == 0 && $coff_set == 0 &&
				(!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
				$remainder =~ /^(else)(?:\s|{)/ &&
				$remainder !~ /^else\s+if\b/) {
			$coff = $off + length($1) - 1;
			$coff_set = 1;
			#warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
		}

		if (($type eq '' || $type eq '(') && $c eq '(') {
			$level++;
			$type = '(';
		}
		if ($type eq '(' && $c eq ')') {
			$level--;
			$type = ($level != 0)? '(' : '';

			if ($level == 0 && $coff < $soff) {
				$coff = $off;
				$coff_set = 1;
				#warn "CSB: mark coff<$coff>\n";
			}
		}
		if (($type eq '' || $type eq '{') && $c eq '{') {
			$level++;
			$type = '{';
		}
		if ($type eq '{' && $c eq '}') {
			$level--;
			$type = ($level != 0)? '{' : '';

			if ($level == 0) {
				if (substr($blk, $off + 1, 1) eq ';') {
					$off++;
				}
				last;
			}
		}
		# Preprocessor commands end at the newline unless escaped.
		if ($type eq '#' && $c eq "\n" && $p ne "\\") {
			$level--;
			$type = '';
			$off++;
			last;
		}
		$off++;
	}
	# We are truly at the end, so shuffle to the next line.
	if ($off == $len) {
		$loff = $len + 1;
		$line++;
		$remain--;
	}

	my $statement = substr($blk, $soff, $off - $soff + 1);
	my $condition = substr($blk, $soff, $coff - $soff + 1);

	#warn "STATEMENT<$statement>\n";
	#warn "CONDITION<$condition>\n";

	#print "coff<$coff> soff<$off> loff<$loff>\n";

	return ($statement, $condition,
			$line, $remain + 1, $off - $loff + 1, $level);
}

sub statement_lines {
	my ($stmt) = @_;

	# Strip the diff line prefixes and rip blank lines at start and end.
	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_rawlines {
	my ($stmt) = @_;

	my @stmt_lines = ($stmt =~ /\n/g);

	return $#stmt_lines + 2;
}

sub statement_block_size {
	my ($stmt) = @_;

	$stmt =~ s/(^|\n)./$1/g;
	$stmt =~ s/^\s*{//;
	$stmt =~ s/}\s*$//;
	$stmt =~ s/^\s*//;
	$stmt =~ s/\s*$//;

	my @stmt_lines = ($stmt =~ /\n/g);
	my @stmt_statements = ($stmt =~ /;/g);

	my $stmt_lines = $#stmt_lines + 2;
	my $stmt_statements = $#stmt_statements + 1;

	if ($stmt_lines > $stmt_statements) {
		return $stmt_lines;
	} else {
		return $stmt_statements;
	}
}

sub ctx_statement_full {
	my ($linenr, $remain, $off) = @_;
	my ($statement, $condition, $level);

	my (@chunks);

	# Grab the first conditional/block pair.
	($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
	#print "F: c<$condition> s<$statement> remain<$remain>\n";
	push(@chunks, [ $condition, $statement ]);
	if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
		return ($level, $linenr, @chunks);
	}

	# Pull in the following conditional/block pairs and see if they
	# could continue the statement.
	for (;;) {
		($statement, $condition, $linenr, $remain, $off, $level) =
				ctx_statement_block($linenr, $remain, $off);
		#print "C: c<$condition> s<$statement> remain<$remain>\n";
		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
		#print "C: push\n";
		push(@chunks, [ $condition, $statement ]);
	}

	return ($level, $linenr, @chunks);
}

sub ctx_block_get {
	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
	my $line;
	my $start = $linenr - 1;
	my $blk = '';
	my @o;
	my @c;
	my @res = ();

	my $level = 0;
	my @stack = ($level);
	for ($line = $start; $remain > 0; $line++) {
		next if ($rawlines[$line] =~ /^-/);
		$remain--;

		$blk .= $rawlines[$line];

		# Handle nested #if/#else.
		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
			push(@stack, $level);
		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
			$level = $stack[$#stack - 1];
		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
			$level = pop(@stack);
		}

		foreach my $c (split(//, $lines[$line])) {
			##print "C<$c>L<$level><$open$close>O<$off>\n";
			if ($off > 0) {
				$off--;
				next;
			}

			if ($c eq $close && $level > 0) {
				$level--;
				last if ($level == 0);
			} elsif ($c eq $open) {
				$level++;
			}
		}

		if (!$outer || $level <= 1) {
			push(@res, $rawlines[$line]);
		}

		last if ($level == 0);
	}

	return ($level, @res);
}
sub ctx_block_outer {
	my ($linenr, $remain) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
	return @r;
}
sub ctx_block {
	my ($linenr, $remain) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
	return @r;
}
sub ctx_statement {
	my ($linenr, $remain, $off) = @_;

	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
	return @r;
}
sub ctx_block_level {
	my ($linenr, $remain) = @_;

	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
}
sub ctx_statement_level {
	my ($linenr, $remain, $off) = @_;

	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}

sub ctx_locate_comment {
	my ($first_line, $end_line) = @_;

	# Catch a comment on the end of the line itself.
	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
	return $current_comment if (defined $current_comment);

	# Look through the context and try and figure out if there is a
	# comment.
	my $in_comment = 0;
	$current_comment = '';
	for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
		my $line = $rawlines[$linenr - 1];
		#warn "           $line\n";
		if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
			$in_comment = 1;
		}
		if ($line =~ m@/\*@) {
			$in_comment = 1;
		}
		if (!$in_comment && $current_comment ne '') {
			$current_comment = '';
		}
		$current_comment .= $line . "\n" if ($in_comment);
		if ($line =~ m@\*/@) {
			$in_comment = 0;
		}
	}

	chomp($current_comment);
	return($current_comment);
}
sub ctx_has_comment {
	my ($first_line, $end_line) = @_;
	my $cmt = ctx_locate_comment($first_line, $end_line);

	##print "LINE: $rawlines[$end_line - 1 ]\n";
	##print "CMMT: $cmt\n";

	return ($cmt ne '');
}

sub raw_line {
	my ($linenr, $cnt) = @_;

	my $offset = $linenr - 1;
	$cnt++;

	my $line;
	while ($cnt) {
		$line = $rawlines[$offset++];
		next if (defined($line) && $line =~ /^-/);
		$cnt--;
	}

	return $line;
}

sub get_stat_real {
	my ($linenr, $lc) = @_;

	my $stat_real = raw_line($linenr, 0);
	for (my $count = $linenr + 1; $count <= $lc; $count++) {
		$stat_real = $stat_real . "\n" . raw_line($count, 0);
	}

	return $stat_real;
}

sub get_stat_here {
	my ($linenr, $cnt, $here) = @_;

	my $herectx = $here . "\n";
	for (my $n = 0; $n < $cnt; $n++) {
		$herectx .= raw_line($linenr, $n) . "\n";
	}

	return $herectx;
}

sub cat_vet {
	my ($vet) = @_;
	my ($res, $coded);

	$res = '';
	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
		$res .= $1;
		if ($2 ne '') {
			$coded = sprintf("^%c", unpack('C', $2) + 64);
			$res .= $coded;
		}
	}
	$res =~ s/$/\$/;

	return $res;
}

my $av_preprocessor = 0;
my $av_pending;
my @av_paren_type;
my $av_pend_colon;

sub annotate_reset {
	$av_preprocessor = 0;
	$av_pending = '_';
	@av_paren_type = ('E');
	$av_pend_colon = 'O';
}

sub annotate_values {
	my ($stream, $type) = @_;

	my $res;
	my $var = '_' x length($stream);
	my $cur = $stream;

	print "$stream\n" if ($dbg_values > 1);

	while (length($cur)) {
		@av_paren_type = ('E') if ($#av_paren_type < 0);
		print " <" . join('', @av_paren_type) .
				"> <$type> <$av_pending>" if ($dbg_values > 1);
		if ($cur =~ /^(\s+)/o) {
			print "WS($1)\n" if ($dbg_values > 1);
			if ($1 =~ /\n/ && $av_preprocessor) {
				$type = pop(@av_paren_type);
				$av_preprocessor = 0;
			}

		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
			print "CAST($1)\n" if ($dbg_values > 1);
			push(@av_paren_type, $type);
			$type = 'c';

		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
			print "DECLARE($1)\n" if ($dbg_values > 1);
			$type = 'T';

		} elsif ($cur =~ /^($Modifier)\s*/) {
			print "MODIFIER($1)\n" if ($dbg_values > 1);
			$type = 'T';

		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);
			if ($2 ne '') {
				$av_pending = 'N';
			}
			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
			print "UNDEF($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;
			push(@av_paren_type, $type);

		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
			print "PRE_START($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

			push(@av_paren_type, $type);
			push(@av_paren_type, $type);
			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
			$av_preprocessor = 1;

			push(@av_paren_type, $av_paren_type[$#av_paren_type]);

			$type = 'E';

		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
			print "PRE_END($1)\n" if ($dbg_values > 1);

			$av_preprocessor = 1;

			# Assume all arms of the conditional end as this
			# one does, and continue as if the #endif was not here.
			pop(@av_paren_type);
			push(@av_paren_type, $type);
			$type = 'E';

		} elsif ($cur =~ /^(\\\n)/o) {
			print "PRECONT($1)\n" if ($dbg_values > 1);

		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
			print "ATTR($1)\n" if ($dbg_values > 1);
			$av_pending = $type;
			$type = 'N';

		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
			print "SIZEOF($1)\n" if ($dbg_values > 1);
			if (defined $2) {
				$av_pending = 'V';
			}
			$type = 'N';

		} elsif ($cur =~ /^(if|while|for)\b/o) {
			print "COND($1)\n" if ($dbg_values > 1);
			$av_pending = 'E';
			$type = 'N';

		} elsif ($cur =~/^(case)/o) {
			print "CASE($1)\n" if ($dbg_values > 1);
			$av_pend_colon = 'C';
			$type = 'N';

		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
			print "KEYWORD($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(\()/o) {
			print "PAREN('$1')\n" if ($dbg_values > 1);
			push(@av_paren_type, $av_pending);
			$av_pending = '_';
			$type = 'N';

		} elsif ($cur =~ /^(\))/o) {
			my $new_type = pop(@av_paren_type);
			if ($new_type ne '_') {
				$type = $new_type;
				print "PAREN('$1') -> $type\n"
							if ($dbg_values > 1);
			} else {
				print "PAREN('$1')\n" if ($dbg_values > 1);
			}

		} elsif ($cur =~ /^($Ident)\s*\(/o) {
			print "FUNC($1)\n" if ($dbg_values > 1);
			$type = 'V';
			$av_pending = 'V';

		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
			if (defined $2 && $type eq 'C' || $type eq 'T') {
				$av_pend_colon = 'B';
			} elsif ($type eq 'E') {
				$av_pend_colon = 'L';
			}
			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
			$type = 'V';

		} elsif ($cur =~ /^($Ident|$Constant)/o) {
			print "IDENT($1)\n" if ($dbg_values > 1);
			$type = 'V';

		} elsif ($cur =~ /^($Assignment)/o) {
			print "ASSIGN($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~/^(;|{|})/) {
			print "END($1)\n" if ($dbg_values > 1);
			$type = 'E';
			$av_pend_colon = 'O';

		} elsif ($cur =~/^(,)/) {
			print "COMMA($1)\n" if ($dbg_values > 1);
			$type = 'C';

		} elsif ($cur =~ /^(\?)/o) {
			print "QUESTION($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(:)/o) {
			print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);

			substr($var, length($res), 1, $av_pend_colon);
			if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
				$type = 'E';
			} else {
				$type = 'N';
			}
			$av_pend_colon = 'O';

		} elsif ($cur =~ /^(\[)/o) {
			print "CLOSE($1)\n" if ($dbg_values > 1);
			$type = 'N';

		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
			my $variant;

			print "OPV($1)\n" if ($dbg_values > 1);
			if ($type eq 'V') {
				$variant = 'B';
			} else {
				$variant = 'U';
			}

			substr($var, length($res), 1, $variant);
			$type = 'N';

		} elsif ($cur =~ /^($Operators)/o) {
			print "OP($1)\n" if ($dbg_values > 1);
			if ($1 ne '++' && $1 ne '--') {
				$type = 'N';
			}

		} elsif ($cur =~ /(^.)/o) {
			print "C($1)\n" if ($dbg_values > 1);
		}
		if (defined $1) {
			$cur = substr($cur, length($1));
			$res .= $type x length($1);
		}
	}

	return ($res, $var);
}

sub possible {
	my ($possible, $line) = @_;
	my $notPermitted = qr{(?:
		^(?:
			$Modifier|
			$Storage|
			$Type|
			DEFINE_\S+
		)$|
		^(?:
			goto|
			return|
			case|
			else|
			asm|__asm__|
			do|
			\#|
			\#\#|
		)(?:\s|$)|
		^(?:typedef|struct|enum)\b
	    )}x;
	warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
	if ($possible !~ $notPermitted) {
		# Check for modifiers.
		$possible =~ s/\s*$Storage\s*//g;
		$possible =~ s/\s*$Sparse\s*//g;
		if ($possible =~ /^\s*$/) {

		} elsif ($possible =~ /\s/) {
			$possible =~ s/\s*$Type\s*//g;
			for my $modifier (split(' ', $possible)) {
				if ($modifier !~ $notPermitted) {
					warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
					push(@modifierListFile, $modifier);
				}
			}

		} else {
			warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
			push(@typeListFile, $possible);
		}
		build_types();
	} else {
		warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
	}
}

my $prefix = '';

sub show_type {
	my ($type) = @_;

	$type =~ tr/[a-z]/[A-Z]/;

	return defined $use_type{$type} if (scalar keys %use_type > 0);

	return !defined $ignore_type{$type};
}

sub report {
	my ($level, $type, $msg) = @_;

	if (!show_type($type) ||
	    (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
		return 0;
	}
	my $output = '';
	if ($color) {
		if ($level eq 'ERROR') {
			$output .= RED;
		} elsif ($level eq 'WARNING') {
			$output .= YELLOW;
		} else {
			$output .= GREEN;
		}
	}
	$output .= $prefix . $level . ':';
	if ($show_types) {
		$output .= BLUE if ($color);
		$output .= "$type:";
	}
	$output .= RESET if ($color);
	$output .= ' ' . $msg . "\n";

	if ($showfile) {
		my @lines = split("\n", $output, -1);
		splice(@lines, 1, 1);
		$output = join("\n", @lines);
	}
	$output = (split('\n', $output))[0] . "\n" if ($terse);

	push(our @report, $output);

	return 1;
}

sub report_dump {
	our @report;
}

sub fixup_current_range {
	my ($lineRef, $offset, $length) = @_;

	if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
		my $o = $1;
		my $l = $2;
		my $no = $o + $offset;
		my $nl = $l + $length;
		$$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
	}
}

sub fix_inserted_deleted_lines {
	my ($linesRef, $insertedRef, $deletedRef) = @_;

	my $range_last_linenr = 0;
	my $delta_offset = 0;

	my $old_linenr = 0;
	my $new_linenr = 0;

	my $next_insert = 0;
	my $next_delete = 0;

	my @lines = ();

	my $inserted = @{$insertedRef}[$next_insert++];
	my $deleted = @{$deletedRef}[$next_delete++];

	foreach my $old_line (@{$linesRef}) {
		my $save_line = 1;
		my $line = $old_line;	#don't modify the array
		if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {	#new filename
			$delta_offset = 0;
		} elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {	#new hunk
			$range_last_linenr = $new_linenr;
			fixup_current_range(\$line, $delta_offset, 0);
		}

		while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
			$deleted = @{$deletedRef}[$next_delete++];
			$save_line = 0;
			fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
		}

		while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
			push(@lines, ${$inserted}{'LINE'});
			$inserted = @{$insertedRef}[$next_insert++];
			$new_linenr++;
			fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
		}

		if ($save_line) {
			push(@lines, $line);
			$new_linenr++;
		}

		$old_linenr++;
	}

	return @lines;
}

sub fix_insert_line {
	my ($linenr, $line) = @_;

	my $inserted = {
		LINENR => $linenr,
		LINE => $line,
	};
	push(@fixed_inserted, $inserted);
}

sub fix_delete_line {
	my ($linenr, $line) = @_;

	my $deleted = {
		LINENR => $linenr,
		LINE => $line,
	};

	push(@fixed_deleted, $deleted);
}

sub ERROR {
	my ($type, $msg) = @_;

	if (report("ERROR", $type, $msg)) {
		our $clean = 0;
		our $cnt_error++;
		return 1;
	}
	return 0;
}
sub WARN {
	my ($type, $msg) = @_;

	if (report("WARNING", $type, $msg)) {
		our $clean = 0;
		our $cnt_warn++;
		return 1;
	}
	return 0;
}
sub CHK {
	my ($type, $msg) = @_;

	if ($check && report("CHECK", $type, $msg)) {
		our $clean = 0;
		our $cnt_chk++;
		return 1;
	}
	return 0;
}

sub check_absolute_file {
	my ($absolute, $herecurr) = @_;
	my $file = $absolute;

	##print "absolute<$absolute>\n";

	# See if any suffix of this path is a path within the tree.
	while ($file =~ s@^[^/]*/@@) {
		if (-f "$root/$file") {
			##print "file<$file>\n";
			last;
		}
	}
	if (! -f _)  {
		return 0;
	}

	# It is, so see if the prefix is acceptable.
	my $prefix = $absolute;
	substr($prefix, -length($file)) = '';

	##print "prefix<$prefix>\n";
	if ($prefix ne ".../") {
		WARN("USE_RELATIVE_PATH",
		     "use relative pathname instead of absolute in changelog text\n" . $herecurr);
	}
}

sub trim {
	my ($string) = @_;

	$string =~ s/^\s+|\s+$//g;

	return $string;
}

sub ltrim {
	my ($string) = @_;

	$string =~ s/^\s+//;

	return $string;
}

sub rtrim {
	my ($string) = @_;

	$string =~ s/\s+$//;

	return $string;
}

sub string_find_replace {
	my ($string, $find, $replace) = @_;

	$string =~ s/$find/$replace/g;

	return $string;
}

sub tabify {
	my ($leading) = @_;

	my $source_indent = 8;
	my $max_spaces_before_tab = $source_indent - 1;
	my $spaces_to_tab = " " x $source_indent;

	#convert leading spaces to tabs
	1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
	#Remove spaces before a tab
	1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;

	return "$leading";
}

sub pos_last_openparen {
	my ($line) = @_;

	my $pos = 0;

	my $opens = $line =~ tr/\(/\(/;
	my $closes = $line =~ tr/\)/\)/;

	my $last_openparen = 0;

	if (($opens == 0) || ($closes >= $opens)) {
		return -1;
	}

	my $len = length($line);

	for ($pos = 0; $pos < $len; $pos++) {
		my $string = substr($line, $pos);
		if ($string =~ /^($FuncArg|$balanced_parens)/) {
			$pos += length($1) - 1;
		} elsif (substr($line, $pos, 1) eq '(') {
			$last_openparen = $pos;
		} elsif (index($string, '(') == -1) {
			last;
		}
	}

	return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
}

sub process {
	my $filename = shift;

	my $linenr=0;
	my $prevline="";
	my $prevrawline="";
	my $stashline="";
	my $stashrawline="";

	my $length;
	my $indent;
	my $previndent=0;
	my $stashindent=0;

	our $clean = 1;
	my $signoff = 0;
	my $author = '';
	my $authorsignoff = 0;
	my $is_patch = 0;
	my $is_binding_patch = -1;
	my $in_header_lines = $file ? 0 : 1;
	my $in_commit_log = 0;		#Scanning lines before patch
	my $has_commit_log = 0;		#Encountered lines before patch
	my $commit_log_lines = 0;	#Number of commit log lines
	my $commit_log_possible_stack_dump = 0;
	my $commit_log_long_line = 0;
	my $commit_log_has_diff = 0;
	my $reported_maintainer_file = 0;
	my $non_utf8_charset = 0;

	my $last_blank_line = 0;
	my $last_coalesced_string_linenr = -1;

	our @report = ();
	our $cnt_lines = 0;
	our $cnt_error = 0;
	our $cnt_warn = 0;
	our $cnt_chk = 0;

	# Trace the real file/line as we go.
	my $realfile = '';
	my $realline = 0;
	my $realcnt = 0;
	my $here = '';
	my $context_function;		#undef'd unless there's a known function
	my $in_comment = 0;
	my $comment_edge = 0;
	my $first_line = 0;
	my $p1_prefix = '';

	my $prev_values = 'E';

	# suppression flags
	my %suppress_ifbraces;
	my %suppress_whiletrailers;
	my %suppress_export;
	my $suppress_statement = 0;

	my %signatures = ();

	# Pre-scan the patch sanitizing the lines.
	# Pre-scan the patch looking for any __setup documentation.
	#
	my @setup_docs = ();
	my $setup_docs = 0;

	my $camelcase_file_seeded = 0;

	my $checklicenseline = 1;

	sanitise_line_reset();
	my $line;
	foreach my $rawline (@rawlines) {
		$linenr++;
		$line = $rawline;

		push(@fixed, $rawline) if ($fix);

		if ($rawline=~/^\+\+\+\s+(\S+)/) {
			$setup_docs = 0;
			if ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) {
				$setup_docs = 1;
			}
			#next;
		}
		if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
			$realline=$1-1;
			if (defined $2) {
				$realcnt=$3+1;
			} else {
				$realcnt=1+1;
			}
			$in_comment = 0;

			# Guestimate if this is a continuing comment.  Run
			# the context looking for a comment "edge".  If this
			# edge is a close comment then we must be in a comment
			# at context start.
			my $edge;
			my $cnt = $realcnt;
			for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
				next if (defined $rawlines[$ln - 1] &&
					 $rawlines[$ln - 1] =~ /^-/);
				$cnt--;
				#print "RAW<$rawlines[$ln - 1]>\n";
				last if (!defined $rawlines[$ln - 1]);
				if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
				    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
					($edge) = $1;
					last;
				}
			}
			if (defined $edge && $edge eq '*/') {
				$in_comment = 1;
			}

			# Guestimate if this is a continuing comment.  If this
			# is the start of a diff block and this line starts
			# ' *' then it is very likely a comment.
			if (!defined $edge &&
			    $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
			{
				$in_comment = 1;
			}

			##print "COMMENT:$in_comment edge<$edge> $rawline\n";
			sanitise_line_reset($in_comment);

		} elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
			# Standardise the strings and chars within the input to
			# simplify matching -- only bother with positive lines.
			$line = sanitise_line($rawline);
		}
		push(@lines, $line);

		if ($realcnt > 1) {
			$realcnt-- if ($line =~ /^(?:\+| |$)/);
		} else {
			$realcnt = 0;
		}

		#print "==>$rawline\n";
		#print "-->$line\n";

		if ($setup_docs && $line =~ /^\+/) {
			push(@setup_docs, $line);
		}
	}

	$prefix = '';

	$realcnt = 0;
	$linenr = 0;
	$fixlinenr = -1;
	foreach my $line (@lines) {
		$linenr++;
		$fixlinenr++;
		my $sline = $line;	#copy of $line
		$sline =~ s/$;/ /g;	#with comments as spaces

		my $rawline = $rawlines[$linenr - 1];

# check if it's a mode change, rename or start of a patch
		if (!$in_commit_log &&
		    ($line =~ /^ mode change [0-7]+ => [0-7]+ \S+\s*$/ ||
		    ($line =~ /^rename (?:from|to) \S+\s*$/ ||
		     $line =~ /^diff --git a\/[\w\/\.\_\-]+ b\/\S+\s*$/))) {
			$is_patch = 1;
		}

#extract the line range in the file after the patch is applied
		if (!$in_commit_log &&
		    $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
			my $context = $4;
			$is_patch = 1;
			$first_line = $linenr + 1;
			$realline=$1-1;
			if (defined $2) {
				$realcnt=$3+1;
			} else {
				$realcnt=1+1;
			}
			annotate_reset();
			$prev_values = 'E';

			%suppress_ifbraces = ();
			%suppress_whiletrailers = ();
			%suppress_export = ();
			$suppress_statement = 0;
			if ($context =~ /\b(\w+)\s*\(/) {
				$context_function = $1;
			} else {
				undef $context_function;
			}
			next;

# track the line number as we move through the hunk, note that
# new versions of GNU diff omit the leading space on completely
# blank context lines so we need to count that too.
		} elsif ($line =~ /^( |\+|$)/) {
			$realline++;
			$realcnt-- if ($realcnt != 0);

			# Measure the line length and indent.
			($length, $indent) = line_stats($rawline);

			# Track the previous line.
			($prevline, $stashline) = ($stashline, $line);
			($previndent, $stashindent) = ($stashindent, $indent);
			($prevrawline, $stashrawline) = ($stashrawline, $rawline);

			#warn "line<$line>\n";

		} elsif ($realcnt == 1) {
			$realcnt--;
		}

		my $hunk_line = ($realcnt != 0);

		$here = "#$linenr: " if (!$file);
		$here = "#$realline: " if ($file);

		my $found_file = 0;
		# extract the filename as it passes
		if ($line =~ /^diff --git.*?(\S+)$/) {
			$realfile = $1;
			$realfile =~ s@^([^/]*)/@@ if (!$file);
			$in_commit_log = 0;
			$found_file = 1;
		} elsif ($line =~ /^\+\+\+\s+(\S+)/) {
			$realfile = $1;
			$realfile =~ s@^([^/]*)/@@ if (!$file);
			$in_commit_log = 0;

			$p1_prefix = $1;
			if (!$file && $tree && $p1_prefix ne '' &&
			    -e "$root/$p1_prefix") {
				WARN("PATCH_PREFIX",
				     "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
			}

			if ($realfile =~ m@^include/asm/@) {
				ERROR("MODIFIED_INCLUDE_ASM",
				      "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
			}
			$found_file = 1;
		}

#make up the handle for any error we report on this line
		if ($showfile) {
			$prefix = "$realfile:$realline: "
		} elsif ($emacs) {
			if ($file) {
				$prefix = "$filename:$realline: ";
			} else {
				$prefix = "$filename:$linenr: ";
			}
		}

		if ($found_file) {
			if (is_maintained_obsolete($realfile)) {
				WARN("OBSOLETE",
				     "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.\n");
			}
			if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
				$check = 1;
			} else {
				$check = $check_orig;
			}
			$checklicenseline = 1;

			if ($realfile !~ /^MAINTAINERS/) {
				my $last_binding_patch = $is_binding_patch;

				$is_binding_patch = () = $realfile =~ m@^(?:Documentation/devicetree/|include/dt-bindings/)@;

				if (($last_binding_patch != -1) &&
				    ($last_binding_patch ^ $is_binding_patch)) {
					WARN("DT_SPLIT_BINDING_PATCH",
					     "DT binding docs and includes should be a separate patch. See: Documentation/devicetree/bindings/submitting-patches.txt\n");
				}
			}

			next;
		}

		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);

		my $hereline = "$here\n$rawline\n";
		my $herecurr = "$here\n$rawline\n";
		my $hereprev = "$here\n$prevrawline\n$rawline\n";

		$cnt_lines++ if ($realcnt != 0);

# Verify the existence of a commit log if appropriate
# 2 is used because a $signature is counted in $commit_log_lines
		if ($in_commit_log) {
			if ($line !~ /^\s*$/) {
				$commit_log_lines++;	#could be a $signature
			}
		} elsif ($has_commit_log && $commit_log_lines < 2) {
			WARN("COMMIT_MESSAGE",
			     "Missing commit description - Add an appropriate one\n");
			$commit_log_lines = 2;	#warn only once
		}

# Check if the commit log has what seems like a diff which can confuse patch
		if ($in_commit_log && !$commit_log_has_diff &&
		    (($line =~ m@^\s+diff\b.*a/[\w/]+@ &&
		      $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) ||
		     $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
		     $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
			ERROR("DIFF_IN_COMMIT_MSG",
			      "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr);
			$commit_log_has_diff = 1;
		}

# Check for incorrect file permissions
		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
			my $permhere = $here . "FILE: $realfile\n";
			if ($realfile !~ m@scripts/@ &&
			    $realfile !~ /\.(py|pl|awk|sh)$/) {
				ERROR("EXECUTE_PERMISSIONS",
				      "do not set execute permissions for source files\n" . $permhere);
			}
		}

# Check the patch for a From:
		if (decode("MIME-Header", $line) =~ /^From:\s*(.*)/) {
			$author = $1;
			$author = encode("utf8", $author) if ($line =~ /=\?utf-8\?/i);
			$author =~ s/"//g;
		}

# Check the patch for a signoff:
		if ($line =~ /^\s*signed-off-by:/i) {
			$signoff++;
			$in_commit_log = 0;
			if ($author ne '') {
				my $l = $line;
				$l =~ s/"//g;
				if ($l =~ /^\s*signed-off-by:\s*\Q$author\E/i) {
				    $authorsignoff = 1;
				}
			}
		}

# Check if MAINTAINERS is being updated.  If so, there's probably no need to
# emit the "does MAINTAINERS need updating?" message on file add/move/delete
		if ($line =~ /^\s*MAINTAINERS\s*\|/) {
			$reported_maintainer_file = 1;
		}

# Check signature styles
		if (!$in_header_lines &&
		    $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
			my $space_before = $1;
			my $sign_off = $2;
			my $space_after = $3;
			my $email = $4;
			my $ucfirst_sign_off = ucfirst(lc($sign_off));

			if ($sign_off !~ /$signature_tags/) {
				WARN("BAD_SIGN_OFF",
				     "Non-standard signature: $sign_off\n" . $herecurr);
			}
			if (defined $space_before && $space_before ne "") {
				if (WARN("BAD_SIGN_OFF",
					 "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}
			}
			if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
				if (WARN("BAD_SIGN_OFF",
					 "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}

			}
			if (!defined $space_after || $space_after ne " ") {
				if (WARN("BAD_SIGN_OFF",
					 "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =
					    "$ucfirst_sign_off $email";
				}
			}

			my ($email_name, $email_address, $comment) = parse_email($email);
			my $suggested_email = format_email(($email_name, $email_address));
			if ($suggested_email eq "") {
				ERROR("BAD_SIGN_OFF",
				      "Unrecognized email address: '$email'\n" . $herecurr);
			} else {
				my $dequoted = $suggested_email;
				$dequoted =~ s/^"//;
				$dequoted =~ s/" </ </;
				# Don't force email to have quotes
				# Allow just an angle bracketed address
				if ("$dequoted$comment" ne $email &&
				    "<$email_address>$comment" ne $email &&
				    "$suggested_email$comment" ne $email) {
					WARN("BAD_SIGN_OFF",
					     "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
				}
			}

# Check for duplicate signatures
			my $sig_nospace = $line;
			$sig_nospace =~ s/\s//g;
			$sig_nospace = lc($sig_nospace);
			if (defined $signatures{$sig_nospace}) {
				WARN("BAD_SIGN_OFF",
				     "Duplicate signature\n" . $herecurr);
			} else {
				$signatures{$sig_nospace} = 1;
			}
		}

# Check email subject for common tools that don't need to be mentioned
		if ($in_header_lines &&
		    $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
			WARN("EMAIL_SUBJECT",
			     "A patch subject line should describe the change not the tool that found it\n" . $herecurr);
		}

# Check for unwanted Gerrit info
		if ($in_commit_log && $line =~ /^\s*change-id:/i) {
			ERROR("GERRIT_CHANGE_ID",
			      "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr);
		}

# Check if the commit log is in a possible stack dump
		if ($in_commit_log && !$commit_log_possible_stack_dump &&
		    ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
		     $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
					# timestamp
		     $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/)) {
					# stack dump address
			$commit_log_possible_stack_dump = 1;
		}

# Check for line lengths > 75 in commit log, warn once
		if ($in_commit_log && !$commit_log_long_line &&
		    length($line) > 75 &&
		    !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
					# file delta changes
		      $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
					# filename then :
		      $line =~ /^\s*(?:Fixes:|Link:)/i ||
					# A Fixes: or Link: line
		      $commit_log_possible_stack_dump)) {
			WARN("COMMIT_LOG_LONG_LINE",
			     "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
			$commit_log_long_line = 1;
		}

# Reset possible stack dump if a blank line is found
		if ($in_commit_log && $commit_log_possible_stack_dump &&
		    $line =~ /^\s*$/) {
			$commit_log_possible_stack_dump = 0;
		}

# Check for git id commit length and improperly formed commit descriptions
		if ($in_commit_log && !$commit_log_possible_stack_dump &&
		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i &&
		    $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
		    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
		     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
		      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
		      $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
			my $init_char = "c";
			my $orig_commit = "";
			my $short = 1;
			my $long = 0;
			my $case = 1;
			my $space = 1;
			my $hasdesc = 0;
			my $hasparens = 0;
			my $id = '0123456789ab';
			my $orig_desc = "commit description";
			my $description = "";

			if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
				$init_char = $1;
				$orig_commit = lc($2);
			} elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) {
				$orig_commit = lc($1);
			}

			$short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
			$long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
			$space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
			$case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
			if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
				$orig_desc = $1;
				$hasparens = 1;
			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
				 defined $rawlines[$linenr] &&
				 $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
				$orig_desc = $1;
				$hasparens = 1;
			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
				 defined $rawlines[$linenr] &&
				 $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
				$line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
				$orig_desc = $1;
				$rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
				$orig_desc .= " " . $1;
				$hasparens = 1;
			}

			($id, $description) = git_commit_info($orig_commit,
							      $id, $orig_desc);

			if (defined($id) &&
			   ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) {
				ERROR("GIT_COMMIT_ID",
				      "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr);
			}
		}

# Check for added, moved or deleted files
		if (!$reported_maintainer_file && !$in_commit_log &&
		    ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
		     $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
		     ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
		      (defined($1) || defined($2))))) {
			$is_patch = 1;
			$reported_maintainer_file = 1;
			WARN("FILE_PATH_CHANGES",
			     "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
		}

# Check for wrappage within a valid hunk of the file
		if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
			ERROR("CORRUPTED_PATCH",
			      "patch seems to be corrupt (line wrapped?)\n" .
				$herecurr) if (!$emitted_corrupt++);
		}

# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
		if (($realfile =~ /^$/ || $line =~ /^\+/) &&
		    $rawline !~ m/^$UTF8*$/) {
			my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);

			my $blank = copy_spacing($rawline);
			my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
			my $hereptr = "$hereline$ptr\n";

			CHK("INVALID_UTF8",
			    "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
		}

# Check if it's the start of a commit log
# (not a header line and we haven't seen the patch filename)
		if ($in_header_lines && $realfile =~ /^$/ &&
		    !($rawline =~ /^\s+(?:\S|$)/ ||
		      $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {
			$in_header_lines = 0;
			$in_commit_log = 1;
			$has_commit_log = 1;
		}

# Check if there is UTF-8 in a commit log when a mail header has explicitly
# declined it, i.e defined some charset where it is missing.
		if ($in_header_lines &&
		    $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
		    $1 !~ /utf-8/i) {
			$non_utf8_charset = 1;
		}

		if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
		    $rawline =~ /$NON_ASCII_UTF8/) {
			WARN("UTF8_BEFORE_PATCH",
			    "8-bit UTF-8 used in possible commit log\n" . $herecurr);
		}

# Check for absolute kernel paths in commit message
		if ($tree && $in_commit_log) {
			while ($line =~ m{(?:^|\s)(/\S*)}g) {
				my $file = $1;

				if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
				    check_absolute_file($1, $herecurr)) {
					#
				} else {
					check_absolute_file($file, $herecurr);
				}
			}
		}

# Check for various typo / spelling mistakes
		if (defined($misspellings) &&
		    ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
			while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
				my $typo = $1;
				my $typo_fix = $spelling_fix{lc($typo)};
				$typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
				$typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);
				my $msg_level = \&WARN;
				$msg_level = \&CHK if ($file);
				if (&{$msg_level}("TYPO_SPELLING",
						  "'$typo' may be misspelled - perhaps '$typo_fix'?\n" . $herecurr) &&
				    $fix) {
					$fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
				}
			}
		}

# ignore non-hunk lines and lines being removed
		next if (!$hunk_line || $line =~ /^-/);

#trailing whitespace
		if ($line =~ /^\+.*\015/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (ERROR("DOS_LINE_ENDINGS",
				  "DOS line endings\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/[\s\015]+$//;
			}
		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			if (ERROR("TRAILING_WHITESPACE",
				  "trailing whitespace\n" . $herevet) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/\s+$//;
			}

			$rpt_cleaners = 1;
		}

# Check for FSF mailing addresses.
		if ($rawline =~ /\bwrite to the Free/i ||
		    $rawline =~ /\b675\s+Mass\s+Ave/i ||
		    $rawline =~ /\b59\s+Temple\s+Pl/i ||
		    $rawline =~ /\b51\s+Franklin\s+St/i) {
			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
			my $msg_level = \&ERROR;
			$msg_level = \&CHK if ($file);
			&{$msg_level}("FSF_MAILING_ADDRESS",
				      "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.\n" . $herevet)
		}

# check for Kconfig help text having a real description
# Only applies when adding the entry originally, after that we do not have
# sufficient context to determine whether it is indeed long enough.
		if ($realfile =~ /Kconfig/ &&
		    # 'choice' is usually the last thing on the line (though
		    # Kconfig supports named choices), so use a word boundary
		    # (\b) rather than a whitespace character (\s)
		    $line =~ /^\+\s*(?:config|menuconfig|choice)\b/) {
			my $length = 0;
			my $cnt = $realcnt;
			my $ln = $linenr + 1;
			my $f;
			my $is_start = 0;
			my $is_end = 0;
			for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {
				$f = $lines[$ln - 1];
				$cnt-- if ($lines[$ln - 1] !~ /^-/);
				$is_end = $lines[$ln - 1] =~ /^\+/;

				next if ($f =~ /^-/);
				last if (!$file && $f =~ /^\@\@/);

				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {
					$is_start = 1;
				} elsif ($lines[$ln - 1] =~ /^\+\s*(?:help|---help---)\s*$/) {
					if ($lines[$ln - 1] =~ "---help---") {
						WARN("CONFIG_DESCRIPTION",
						     "prefer 'help' over '---help---' for new help texts\n" . $herecurr);
					}
					$length = -1;
				}

				$f =~ s/^.//;
				$f =~ s/#.*//;
				$f =~ s/^\s+//;
				next if ($f =~ /^$/);

				# This only checks context lines in the patch
				# and so hopefully shouldn't trigger false
				# positives, even though some of these are
				# common words in help texts
				if ($f =~ /^\s*(?:config|menuconfig|choice|endchoice|
						  if|endif|menu|endmenu|source)\b/x) {
					$is_end = 1;
					last;
				}
				$length++;
			}
			if ($is_start && $is_end && $length < $min_conf_desc_length) {
				WARN("CONFIG_DESCRIPTION",
				     "please write a paragraph that describes the config symbol fully\n" . $herecurr);
			}
			#print "is_start<$is_start> is_end<$is_end> length<$length>\n";
		}

# check for MAINTAINERS entries that don't have the right form
		if ($realfile =~ /^MAINTAINERS$/ &&
		    $rawline =~ /^\+[A-Z]:/ &&
		    $rawline !~ /^\+[A-Z]:\t\S/) {
			if (WARN("MAINTAINERS_STYLE",
				 "MAINTAINERS entries use one tab after TYPE:\n" . $herecurr) &&
			    $fix) {
				$fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/;
			}
		}

# discourage the use of boolean for type definition attributes of Kconfig options
		if ($realfile =~ /Kconfig/ &&
		    $line =~ /^\+\s*\bboolean\b/) {
			WARN("CONFIG_TYPE_BOOLEAN",
			     "Use of boolean is deprecated, please use bool instead.\n" . $herecurr);
		}

		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
		    ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
			my $flag = $1;
			my $replacement = {
				'EXTRA_AFLAGS' =>   'asflags-y',
				'EXTRA_CFLAGS' =>   'ccflags-y',
				'EXTRA_CPPFLAGS' => 'cppflags-y',
				'EXTRA_LDFLAGS' =>  'ldflags-y',
			};

			WARN("DEPRECATED_VARIABLE",
			     "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
		}

# check for DT compatible documentation
		if (defined $root &&
			(($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
			 ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {

			my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;

			my $dt_path = $root . "/Documentation/devicetree/bindings/";
			my $vp_file = $dt_path . "vendor-prefixes.txt";

			foreach my $compat (@compats) {
				my $compat2 = $compat;
				$compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
				my $compat3 = $compat;
				$compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
				`grep -Erq "$compat|$compat2|$compat3" $dt_path`;
				if ( $? >> 8 ) {
					WARN("UNDOCUMENTED_DT_STRING",
					     "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
				}

				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
				my $vendor = $1;
				`grep -Eq "^$vendor\\b" $vp_file`;
				if ( $? >> 8 ) {
					WARN("UNDOCUMENTED_DT_STRING",
					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
				}
			}
		}

# check for using SPDX license tag at beginning of files
		if ($realline == $checklicenseline) {
			if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
				$checklicenseline = 2;
			} elsif ($rawline =~ /^\+/) {
				my $comment = "";
				if ($realfile =~ /\.(h|s|S)$/) {
					$comment = '/*';
				} elsif ($realfile =~ /\.(c|dts|dtsi)$/) {
					$comment = '//';
				} elsif (($checklicenseline == 2) || $realfile =~ /\.(sh|pl|py|awk|tc)$/) {
					$comment = '#';
				} elsif ($realfile =~ /\.rst$/) {
					$comment = '..';
				}

				if ($comment !~ /^$/ &&
				    $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
					 WARN("SPDX_LICENSE_TAG",
					      "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
				} elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
					 my $spdx_license = $1;
					 if (!is_SPDX_License_valid($spdx_license)) {
						  WARN("SPDX_LICENSE_TAG",
						       "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
					 }
				}
			}
		}

# check we are in a valid source file if not then ignore this hunk
		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);

# line length limit (with some exclusions)
#
# There are a few types of lines that may extend beyond $max_line_length:
#	logging functions like pr_info that end in a string
#	lines with a single string
#	#defines that are a single string
#	lines with an RFC3986 like URL
#
# There are 3 different line length message types:
# LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length
# LONG_LINE_STRING	a string starts before but extends beyond $max_line_length
# LONG_LINE		all other lines longer than $max_line_length
#
# if LONG_LINE is ignored, the other 2 types are also ignored
#

		if ($line =~ /^\+/ && $length > $max_line_length) {
			my $msg_type = "LONG_LINE";

			# Check the allowed long line types first

			# logging functions that end in a string that starts
			# before $max_line_length
			if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
			    length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
				$msg_type = "";

			# lines with only strings (w/ possible termination)
			# #defines with only strings
			} elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
				 $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
				$msg_type = "";