mm/khugepaged: factor out common logic in [scan,alloc]_sleep_millisecs_store()

Both scan_sleep_millisecs_store() and alloc_sleep_millisecs_store()
perform the same operations: parse the input value, update their
respective sleep interval, reset khugepaged_sleep_expire, and wake up the
khugepaged thread.

Factor out this duplicated logic into a helper function
__sleep_millisecs_store(), and simplify both store functions.

No functional change intended.

Link: https://lkml.kernel.org/r/20251021134431.26488-1-leon.hwang@linux.dev
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Nico Pache <npache@redhat.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 11 insertions, 16 deletions

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 68e487d53772..643abf4be236 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -129,9 +129,8 @@ static ssize_t scan_sleep_millisecs_show(struct kobject *kobj,
 	return sysfs_emit(buf, "%u\n", khugepaged_scan_sleep_millisecs);
 }
 
-static ssize_t scan_sleep_millisecs_store(struct kobject *kobj,
-					  struct kobj_attribute *attr,
-					  const char *buf, size_t count)
+static ssize_t __sleep_millisecs_store(const char *buf, size_t count,
+				       unsigned int *millisecs)
 {
 	unsigned int msecs;
 	int err;
@@ -140,12 +139,19 @@ static ssize_t scan_sleep_millisecs_store(struct kobject *kobj,
 	if (err)
 		return -EINVAL;
 
-	khugepaged_scan_sleep_millisecs = msecs;
+	*millisecs = msecs;
 	khugepaged_sleep_expire = 0;
 	wake_up_interruptible(&khugepaged_wait);
 
 	return count;
 }
+
+static ssize_t scan_sleep_millisecs_store(struct kobject *kobj,
+					  struct kobj_attribute *attr,
+					  const char *buf, size_t count)
+{
+	return __sleep_millisecs_store(buf, count, &khugepaged_scan_sleep_millisecs);
+}
 static struct kobj_attribute scan_sleep_millisecs_attr =
 	__ATTR_RW(scan_sleep_millisecs);
 
@@ -160,18 +166,7 @@ static ssize_t alloc_sleep_millisecs_store(struct kobject *kobj,
 					   struct kobj_attribute *attr,
 					   const char *buf, size_t count)
 {
-	unsigned int msecs;
-	int err;
-
-	err = kstrtouint(buf, 10, &msecs);
-	if (err)
-		return -EINVAL;
-
-	khugepaged_alloc_sleep_millisecs = msecs;
-	khugepaged_sleep_expire = 0;
-	wake_up_interruptible(&khugepaged_wait);
-
-	return count;
+	return __sleep_millisecs_store(buf, count, &khugepaged_alloc_sleep_millisecs);
 }
 static struct kobj_attribute alloc_sleep_millisecs_attr =
 	__ATTR_RW(alloc_sleep_millisecs);