The sysctl_drop_caches to fs/drop_caches.c, move it into
its own file from /kernel/sysctl.c. And remove the useless
extern variable declaration from include/linux/mm.h
Signed-off-by: Kaixiong Yu <yukaixiong@xxxxxxxxxx>
Reviewed-by: Kees Cook <kees@xxxxxxxxxx>
---
fs/drop_caches.c | 23 +++++++++++++++++++++--
include/linux/mm.h | 6 ------
kernel/sysctl.c | 9 ---------
3 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index d45ef541d848..f2551ace800f 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -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 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);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b7f12988237a..d48933b47076 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3765,12 +3765,6 @@ 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
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 373e018b950c..d638a1bac9af 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2024,15 +2024,6 @@ static struct ctl_table kern_table[] = {
};
static 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,
--
2.25.1
