[PATCH 12/14] mm compaction,sysctl: remove proc input checks out of sysctl handlers

[Sasha Levin <levinsasha928@gmail.com>]

Simplify sysctl handler by removing user input checks and using the callback
provided by the sysctl table.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
 include/linux/compaction.h |    2 --
 kernel/sysctl.c            |    2 +-
 mm/compaction.c            |    8 --------
 3 files changed, 1 insertions(+), 11 deletions(-)

diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 51a90b7..35788e4 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -16,8 +16,6 @@ extern int sysctl_compact_memory;
 extern int sysctl_compaction_handler(struct ctl_table *table, int write,
 			void __user *buffer, size_t *length, loff_t *ppos);
 extern int sysctl_extfrag_threshold;
-extern int sysctl_extfrag_handler(struct ctl_table *table, int write,
-			void __user *buffer, size_t *length, loff_t *ppos);
 
 extern int fragmentation_index(struct zone *zone, unsigned int order);
 extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index dacece7..f9ce79b 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1196,7 +1196,7 @@ static struct ctl_table vm_table[] = {
 		.data		= &sysctl_extfrag_threshold,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= sysctl_extfrag_handler,
+		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= &min_extfrag_threshold,
 		.extra2		= &max_extfrag_threshold,
 	},
diff --git a/mm/compaction.c b/mm/compaction.c
index 58f7a93..74c44f2 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -863,14 +863,6 @@ int sysctl_compaction_handler(struct ctl_table *table, int write,
 	return 0;
 }
 
-int sysctl_extfrag_handler(struct ctl_table *table, int write,
-			void __user *buffer, size_t *length, loff_t *ppos)
-{
-	proc_dointvec_minmax(table, write, buffer, length, ppos);
-
-	return 0;
-}
-
 #if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
 ssize_t sysfs_compact_node(struct device *dev,
 			struct device_attribute *attr,
-- 
1.7.8.5