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Commits on Jul 26, 2011
  1. @bebarino

    kernel/configs.c: include MODULE_*() when CONFIG_IKCONFIG_PROC=n

    bebarino authored committed
    If CONFIG_IKCONFIG=m but CONFIG_IKCONFIG_PROC=n we get a module that has
    no MODULE_LICENSE definition.  Move the MODULE_*() definitions outside the
    CONFIG_IKCONFIG_PROC #ifdef to prevent this configuration from tainting
    the kernel.
    
    Signed-off-by: Stephen Boyd <bebarino@gmail.com>
    Acked-by: Randy Dunlap <rdunlap@xenotime.net>
    Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commits on Oct 15, 2010
  1. @arndb

    llseek: automatically add .llseek fop

    arndb authored
    All file_operations should get a .llseek operation so we can make
    nonseekable_open the default for future file operations without a
    .llseek pointer.
    
    The three cases that we can automatically detect are no_llseek, seq_lseek
    and default_llseek. For cases where we can we can automatically prove that
    the file offset is always ignored, we use noop_llseek, which maintains
    the current behavior of not returning an error from a seek.
    
    New drivers should normally not use noop_llseek but instead use no_llseek
    and call nonseekable_open at open time.  Existing drivers can be converted
    to do the same when the maintainer knows for certain that no user code
    relies on calling seek on the device file.
    
    The generated code is often incorrectly indented and right now contains
    comments that clarify for each added line why a specific variant was
    chosen. In the version that gets submitted upstream, the comments will
    be gone and I will manually fix the indentation, because there does not
    seem to be a way to do that using coccinelle.
    
    Some amount of new code is currently sitting in linux-next that should get
    the same modifications, which I will do at the end of the merge window.
    
    Many thanks to Julia Lawall for helping me learn to write a semantic
    patch that does all this.
    
    ===== begin semantic patch =====
    // This adds an llseek= method to all file operations,
    // as a preparation for making no_llseek the default.
    //
    // The rules are
    // - use no_llseek explicitly if we do nonseekable_open
    // - use seq_lseek for sequential files
    // - use default_llseek if we know we access f_pos
    // - use noop_llseek if we know we don't access f_pos,
    //   but we still want to allow users to call lseek
    //
    @ open1 exists @
    identifier nested_open;
    @@
    nested_open(...)
    {
    <+...
    nonseekable_open(...)
    ...+>
    }
    
    @ open exists@
    identifier open_f;
    identifier i, f;
    identifier open1.nested_open;
    @@
    int open_f(struct inode *i, struct file *f)
    {
    <+...
    (
    nonseekable_open(...)
    |
    nested_open(...)
    )
    ...+>
    }
    
    @ read disable optional_qualifier exists @
    identifier read_f;
    identifier f, p, s, off;
    type ssize_t, size_t, loff_t;
    expression E;
    identifier func;
    @@
    ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
    {
    <+...
    (
       *off = E
    |
       *off += E
    |
       func(..., off, ...)
    |
       E = *off
    )
    ...+>
    }
    
    @ read_no_fpos disable optional_qualifier exists @
    identifier read_f;
    identifier f, p, s, off;
    type ssize_t, size_t, loff_t;
    @@
    ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
    {
    ... when != off
    }
    
    @ write @
    identifier write_f;
    identifier f, p, s, off;
    type ssize_t, size_t, loff_t;
    expression E;
    identifier func;
    @@
    ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
    {
    <+...
    (
      *off = E
    |
      *off += E
    |
      func(..., off, ...)
    |
      E = *off
    )
    ...+>
    }
    
    @ write_no_fpos @
    identifier write_f;
    identifier f, p, s, off;
    type ssize_t, size_t, loff_t;
    @@
    ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
    {
    ... when != off
    }
    
    @ fops0 @
    identifier fops;
    @@
    struct file_operations fops = {
     ...
    };
    
    @ has_llseek depends on fops0 @
    identifier fops0.fops;
    identifier llseek_f;
    @@
    struct file_operations fops = {
    ...
     .llseek = llseek_f,
    ...
    };
    
    @ has_read depends on fops0 @
    identifier fops0.fops;
    identifier read_f;
    @@
    struct file_operations fops = {
    ...
     .read = read_f,
    ...
    };
    
    @ has_write depends on fops0 @
    identifier fops0.fops;
    identifier write_f;
    @@
    struct file_operations fops = {
    ...
     .write = write_f,
    ...
    };
    
    @ has_open depends on fops0 @
    identifier fops0.fops;
    identifier open_f;
    @@
    struct file_operations fops = {
    ...
     .open = open_f,
    ...
    };
    
    // use no_llseek if we call nonseekable_open
    ////////////////////////////////////////////
    @ nonseekable1 depends on !has_llseek && has_open @
    identifier fops0.fops;
    identifier nso ~= "nonseekable_open";
    @@
    struct file_operations fops = {
    ...  .open = nso, ...
    +.llseek = no_llseek, /* nonseekable */
    };
    
    @ nonseekable2 depends on !has_llseek @
    identifier fops0.fops;
    identifier open.open_f;
    @@
    struct file_operations fops = {
    ...  .open = open_f, ...
    +.llseek = no_llseek, /* open uses nonseekable */
    };
    
    // use seq_lseek for sequential files
    /////////////////////////////////////
    @ seq depends on !has_llseek @
    identifier fops0.fops;
    identifier sr ~= "seq_read";
    @@
    struct file_operations fops = {
    ...  .read = sr, ...
    +.llseek = seq_lseek, /* we have seq_read */
    };
    
    // use default_llseek if there is a readdir
    ///////////////////////////////////////////
    @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier readdir_e;
    @@
    // any other fop is used that changes pos
    struct file_operations fops = {
    ... .readdir = readdir_e, ...
    +.llseek = default_llseek, /* readdir is present */
    };
    
    // use default_llseek if at least one of read/write touches f_pos
    /////////////////////////////////////////////////////////////////
    @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier read.read_f;
    @@
    // read fops use offset
    struct file_operations fops = {
    ... .read = read_f, ...
    +.llseek = default_llseek, /* read accesses f_pos */
    };
    
    @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier write.write_f;
    @@
    // write fops use offset
    struct file_operations fops = {
    ... .write = write_f, ...
    +	.llseek = default_llseek, /* write accesses f_pos */
    };
    
    // Use noop_llseek if neither read nor write accesses f_pos
    ///////////////////////////////////////////////////////////
    
    @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier read_no_fpos.read_f;
    identifier write_no_fpos.write_f;
    @@
    // write fops use offset
    struct file_operations fops = {
    ...
     .write = write_f,
     .read = read_f,
    ...
    +.llseek = noop_llseek, /* read and write both use no f_pos */
    };
    
    @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier write_no_fpos.write_f;
    @@
    struct file_operations fops = {
    ... .write = write_f, ...
    +.llseek = noop_llseek, /* write uses no f_pos */
    };
    
    @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    identifier read_no_fpos.read_f;
    @@
    struct file_operations fops = {
    ... .read = read_f, ...
    +.llseek = noop_llseek, /* read uses no f_pos */
    };
    
    @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
    identifier fops0.fops;
    @@
    struct file_operations fops = {
    ...
    +.llseek = noop_llseek, /* no read or write fn */
    };
    ===== End semantic patch =====
    
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    Cc: Julia Lawall <julia@diku.dk>
    Cc: Christoph Hellwig <hch@infradead.org>
Commits on Oct 20, 2008
  1. kernel/configs.c: remove useless comments

    WANG Cong authored committed
    These comments are useless, remove them.
    
    Signed-off-by: WANG Cong <wangcong@zeuux.org>
    Cc: Randy Dunlap <rdunlap@xenotime.net>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commits on Apr 29, 2008
  1. kernel: use non-racy method for proc entries creation

    Denis V. Lunev authored committed
    Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
    be setup before gluing PDE to main tree.
    
    Signed-off-by: Denis V. Lunev <den@openvz.org>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  2. proc: remove proc_root from drivers

    Alexey Dobriyan authored committed
    Remove proc_root export.  Creation and removal works well if parent PDE is
    supplied as NULL -- it worked always that way.
    
    So, one useless export removed and consistency added, some drivers created
    PDEs with &proc_root as parent but removed them as NULL and so on.
    
    Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commits on May 9, 2007
  1. @mita

    use simple_read_from_buffer in kernel/

    mita authored Linus Torvalds committed
    Cleanup using simple_read_from_buffer() for /dev/cpuset/tasks and
    /proc/config.gz.
    
    Cc: Paul Jackson <pj@sgi.com>
    Cc: Randy Dunlap <rdunlap@xenotime.net>
    Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commits on Dec 7, 2006
  1. [PATCH] struct seq_operations and struct file_operations constification

    Helge Deller authored Linus Torvalds committed
     - move some file_operations structs into the .rodata section
    
     - move static strings from policy_types[] array into the .rodata section
    
     - fix generic seq_operations usages, so that those structs may be defined
       as "const" as well
    
    [akpm@osdl.org: couple of fixes]
    Signed-off-by: Helge Deller <deller@gmx.de>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Commits on Jun 30, 2006
  1. @AdrianBunk

    Remove obsolete #include <linux/config.h>

    Jörn Engel authored AdrianBunk committed
    Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
    Signed-off-by: Adrian Bunk <bunk@stusta.de>
Commits on Jan 3, 2006
  1. @AdrianBunk

    update the email address of Randy Dunlap

    AdrianBunk authored Adrian Bunk committed
    This patch removes all references to the bouncing address
    rddunlap@osdl.org and one dead web page from the kernel.
    
    Signed-off-by: Adrian Bunk <bunk@stusta.de>
    Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Commits on Apr 16, 2005
  1. Linux-2.6.12-rc2

    Linus Torvalds authored
    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.
    
    Let it rip!
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