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sysctl: remove register_sysctl_paths()
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The deprecation for register_sysctl_paths() is over. We can rejoice as
we nuke register_sysctl_paths(). The routine register_sysctl_table()
was the only user left of register_sysctl_paths(), so we can now just
open code and move the implementation over to what used to be
to __register_sysctl_paths().

The old dynamic struct ctl_table_set *set is now the point to
sysctl_table_root.default_set.

The old dynamic const struct ctl_path *path was being used in the
routine register_sysctl_paths() with a static:

static const struct ctl_path null_path[] = { {} };

Since this is a null path we can now just simplfy the old routine
and remove its use as its always empty.

This saves us a total of 230 bytes.

$ ./scripts/bloat-o-meter vmlinux.old vmlinux
add/remove: 2/7 grow/shrink: 1/1 up/down: 1015/-1245 (-230)
Function                                     old     new   delta
register_leaf_sysctl_tables.constprop          -     524    +524
register_sysctl_table                         22     497    +475
__pfx_register_leaf_sysctl_tables.constprop       -      16     +16
null_path                                      8       -      -8
__pfx_register_sysctl_paths                   16       -     -16
__pfx_register_leaf_sysctl_tables             16       -     -16
__pfx___register_sysctl_paths                 16       -     -16
__register_sysctl_base                        29      12     -17
register_sysctl_paths                         18       -     -18
register_leaf_sysctl_tables                  534       -    -534
__register_sysctl_paths                      620       -    -620
Total: Before=21259666, After=21259436, chg -0.00%

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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@mcgrof
mcgrof committed May 3, 2023
1 parent 9e7c73c commit 0199849
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Showing 3 changed files with 4 additions and 79 deletions.
55 changes: 4 additions & 51 deletions fs/proc/proc_sysctl.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1575,45 +1575,33 @@ static int register_leaf_sysctl_tables(const char *path, char *pos,
}

/**
* __register_sysctl_paths - register a sysctl table hierarchy
* @set: Sysctl tree to register on
* @path: The path to the directory the sysctl table is in.
* register_sysctl_table - register a sysctl table hierarchy
* @table: the top-level table structure
*
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
* array. A completely 0 filled entry terminates the table.
* We are slowly deprecating this call so avoid its use.
*
* See __register_sysctl_table for more details.
*/
struct ctl_table_header *__register_sysctl_paths(
struct ctl_table_set *set,
const struct ctl_path *path, struct ctl_table *table)
struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
{
struct ctl_table *ctl_table_arg = table;
int nr_subheaders = count_subheaders(table);
struct ctl_table_header *header = NULL, **subheaders, **subheader;
const struct ctl_path *component;
char *new_path, *pos;

pos = new_path = kmalloc(PATH_MAX, GFP_KERNEL);
if (!new_path)
return NULL;

pos[0] = '\0';
for (component = path; component->procname; component++) {
pos = append_path(new_path, pos, component->procname);
if (!pos)
goto out;
}
while (table->procname && table->child && !table[1].procname) {
pos = append_path(new_path, pos, table->procname);
if (!pos)
goto out;
table = table->child;
}
if (nr_subheaders == 1) {
header = __register_sysctl_table(set, new_path, table);
header = __register_sysctl_table(&sysctl_table_root.default_set, new_path, table);
if (header)
header->ctl_table_arg = ctl_table_arg;
} else {
Expand All @@ -1627,7 +1615,7 @@ struct ctl_table_header *__register_sysctl_paths(
header->ctl_table_arg = ctl_table_arg;

if (register_leaf_sysctl_tables(new_path, pos, &subheader,
set, table))
&sysctl_table_root.default_set, table))
goto err_register_leaves;
}

Expand All @@ -1646,41 +1634,6 @@ struct ctl_table_header *__register_sysctl_paths(
header = NULL;
goto out;
}

/**
* register_sysctl_paths - register a sysctl table hierarchy
* @path: The path to the directory the sysctl table is in.
* @table: the top-level table structure
*
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
* array. A completely 0 filled entry terminates the table.
* We are slowly deprecating this caller so avoid future uses of it.
*
* See __register_sysctl_paths for more details.
*/
struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
struct ctl_table *table)
{
return __register_sysctl_paths(&sysctl_table_root.default_set,
path, table);
}
EXPORT_SYMBOL(register_sysctl_paths);

/**
* register_sysctl_table - register a sysctl table hierarchy
* @table: the top-level table structure
*
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
* array. A completely 0 filled entry terminates the table.
*
* See register_sysctl_paths for more details.
*/
struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
{
static const struct ctl_path null_path[] = { {} };

return register_sysctl_paths(null_path, table);
}
EXPORT_SYMBOL(register_sysctl_table);

int __register_sysctl_base(struct ctl_table *base_table)
Expand Down
12 changes: 0 additions & 12 deletions include/linux/sysctl.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -221,14 +221,8 @@ extern void retire_sysctl_set(struct ctl_table_set *set);
struct ctl_table_header *__register_sysctl_table(
struct ctl_table_set *set,
const char *path, struct ctl_table *table);
struct ctl_table_header *__register_sysctl_paths(
struct ctl_table_set *set,
const struct ctl_path *path, struct ctl_table *table);
struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
struct ctl_table *table);

void unregister_sysctl_table(struct ctl_table_header * table);

extern int sysctl_init_bases(void);
Expand Down Expand Up @@ -277,12 +271,6 @@ static inline struct ctl_table_header *register_sysctl_mount_point(const char *p
return NULL;
}

static inline struct ctl_table_header *register_sysctl_paths(
const struct ctl_path *path, struct ctl_table *table)
{
return NULL;
}

static inline struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table)
{
return NULL;
Expand Down
16 changes: 0 additions & 16 deletions scripts/check-sysctl-docs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -156,22 +156,6 @@ curtable && /\.procname[\t ]*=[\t ]*".+"/ {
}
}

/register_sysctl_paths\(.*\)/ {
match($0, /register_sysctl_paths\(([^)]+), ([^)]+)\)/, tables)
if (debug) print "Attaching table " tables[2] " to path " tables[1]
if (paths[tables[1]] == table) {
for (entry in entries[tables[2]]) {
printentry(entry)
}
}
split(paths[tables[1]], components, "/")
if (length(components) > 1 && components[1] == table) {
# Count the first subdirectory as seen
seen[components[2]]++
}
}


END {
for (entry in documented) {
if (!seen[entry]) {
Expand Down

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