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Date:   Fri, 16 Jul 2021 11:58:00 +0600
From:   Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
To:     akpm@linux-foundation.org
Cc:     tyhicks@linux.microsoft.com, pasha.tatashin@soleen.com,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] mm: KSM: fix data types
Message-ID: <20210716055800.GA255851@asus>
MIME-Version: 1.0
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Content-Disposition: inline
Precedence: bulk

Change data types of ksm_run and ksm_stable_node_chains_prune_millisecs
as there were a few discrepancies between the types and actual values
that were stored:
1) ksm_run is declared as unsigned long but in run_store(), it is
converted to unsigned int. Change its type to unsigned int.
2) ksm_stable_node_chains_prune_millisecs is declared as int, but in
stable__node_chains_prune_millisecs_store(), it can store values up to
UINT_MAX. Change its type to unsigned int.

Signed-off-by: Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
---
v1 -> v2:
- merge two patches into one

 mm/ksm.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index 3fa9bc8a67cf..2e4bd7662e52 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -259,7 +259,7 @@ static unsigned long ksm_stable_node_chains;
 static unsigned long ksm_stable_node_dups;
 
 /* Delay in pruning stale stable_node_dups in the stable_node_chains */
-static int ksm_stable_node_chains_prune_millisecs = 2000;
+static unsigned int ksm_stable_node_chains_prune_millisecs = 2000;
 
 /* Maximum number of page slots sharing a stable node */
 static int ksm_max_page_sharing = 256;
@@ -289,7 +289,7 @@ static int ksm_nr_node_ids = 1;
 #define KSM_RUN_MERGE	1
 #define KSM_RUN_UNMERGE	2
 #define KSM_RUN_OFFLINE	4
-static unsigned long ksm_run = KSM_RUN_STOP;
+static unsigned int ksm_run = KSM_RUN_STOP;
 static void wait_while_offlining(void);
 
 static DECLARE_WAIT_QUEUE_HEAD(ksm_thread_wait);
@@ -2874,7 +2874,7 @@ KSM_ATTR(pages_to_scan);
 static ssize_t run_show(struct kobject *kobj, struct kobj_attribute *attr,
 			char *buf)
 {
-	return sysfs_emit(buf, "%lu\n", ksm_run);
+	return sysfs_emit(buf, "%u\n", ksm_run);
 }
 
 static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
@@ -3105,11 +3105,11 @@ stable_node_chains_prune_millisecs_store(struct kobject *kobj,
 					 struct kobj_attribute *attr,
 					 const char *buf, size_t count)
 {
-	unsigned long msecs;
+	unsigned int msecs;
 	int err;
 
-	err = kstrtoul(buf, 10, &msecs);
-	if (err || msecs > UINT_MAX)
+	err = kstrtouint(buf, 10, &msecs);
+	if (err)
 		return -EINVAL;
 
 	ksm_stable_node_chains_prune_millisecs = msecs;
-- 
2.25.1