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fs: drop_caches: move sysctl to fs/drop_caches.c

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The sysctl_drop_caches to fs/drop_caches.c, move it to
fs/drop_caches.c from /kernel/sysctl.c. And remove the
useless extern variable declaration from include/linux/mm.h

Signed-off-by: Kaixiong Yu <yukaixiong@huawei.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
This commit is contained in:
Kaixiong Yu 2025-01-11 15:07:45 +08:00 committed by Joel Granados
parent 94eed61d58
commit f5d64ae331
3 changed files with 21 additions and 17 deletions
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23
fs/drop_caches.c
View File

@ -14,7 +14,7 @@
#include "internal.h"
/* A global variable is a bit ugly, but it keeps the code simple */
int sysctl_drop_caches;
static int sysctl_drop_caches;
static void drop_pagecache_sb(struct super_block *sb, void *unused)
{
@ -48,7 +48,7 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
iput(toput_inode);
}
int drop_caches_sysctl_handler(const struct ctl_table *table, int write,
static int drop_caches_sysctl_handler(const struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos)
{
int ret;
@ -77,3 +77,22 @@ int drop_caches_sysctl_handler(const struct ctl_table *table, int write,
}
return 0;
}
static const struct ctl_table drop_caches_table[] = {
{
.procname = "drop_caches",
.data = &sysctl_drop_caches,
.maxlen = sizeof(int),
.mode = 0200,
.proc_handler = drop_caches_sysctl_handler,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_FOUR,
},
};
static int __init init_vm_drop_caches_sysctls(void)
{
register_sysctl_init("vm", drop_caches_table);
return 0;
}
fs_initcall(init_vm_drop_caches_sysctls);

6
include/linux/mm.h
View File

@ -3789,12 +3789,6 @@ static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
#ifdef CONFIG_SYSCTL
extern int sysctl_drop_caches;
int drop_caches_sysctl_handler(const struct ctl_table *, int, void *, size_t *,
loff_t *);
#endif
void drop_slab(void);
#ifndef CONFIG_MMU

9
kernel/sysctl.c
View File

@ -2014,15 +2014,6 @@ static const struct ctl_table kern_table[] = {
};
static const struct ctl_table vm_table[] = {
{
.procname = "drop_caches",
.data = &sysctl_drop_caches,
.maxlen = sizeof(int),
.mode = 0200,
.proc_handler = drop_caches_sysctl_handler,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_FOUR,
},
{
.procname = "vfs_cache_pressure",
.data = &sysctl_vfs_cache_pressure,