From: zhong jiang <zhongjiang@huawei.com>
To: <akpm@linux-foundation.org>, <mhocko@kernel.org>
Cc: <anshuman.khandual@arm.com>, <vbabka@suse.cz>,
<zhongjiang@huawei.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH] mm: Unsigned 'nr_pages' always larger than zero
Date: Wed, 4 Sep 2019 18:26:03 +0800 [thread overview]
Message-ID: <1567592763-25282-1-git-send-email-zhongjiang@huawei.com> (raw)
With the help of unsigned_lesser_than_zero.cocci. Unsigned 'nr_pages"'
compare with zero. And __get_user_pages_locked will return an long value.
Hence, Convert the long to compare with zero is feasible.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
mm/gup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/gup.c b/mm/gup.c
index 23a9f9c..956d5a1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1508,7 +1508,7 @@ static long check_and_migrate_cma_pages(struct task_struct *tsk,
pages, vmas, NULL,
gup_flags);
- if ((nr_pages > 0) && migrate_allow) {
+ if (((long)nr_pages > 0) && migrate_allow) {
drain_allow = true;
goto check_again;
}
--
1.7.12.4
next reply other threads:[~2019-09-04 10:29 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-04 10:26 zhong jiang [this message]
2019-09-04 11:24 ` [PATCH] mm: Unsigned 'nr_pages' always larger than zero Vlastimil Babka
2019-09-04 18:25 ` Weiny, Ira
2019-09-04 18:39 ` Matthew Wilcox
2019-09-04 18:48 ` Andrew Morton
2019-09-04 20:20 ` Weiny, Ira
2019-09-04 20:40 ` Vlastimil Babka
2019-09-05 6:18 ` zhong jiang
2019-09-05 7:19 ` Vlastimil Babka
2019-09-05 6:19 ` John Hubbard
2019-10-16 9:07 ` zhong jiang
2019-10-17 0:49 ` Andrew Morton
2019-10-17 1:38 ` zhong jiang
2019-09-04 19:01 ` Andrew Morton
2019-09-04 20:44 ` Vlastimil Babka
2019-09-05 2:05 ` zhong jiang
2019-10-17 3:19 zhong jiang
2019-10-17 18:01 ` Ira Weiny
2019-10-18 2:01 ` zhong jiang
2019-10-17 20:42 ` John Hubbard
2019-10-18 2:15 ` zhong jiang
2019-10-18 14:00 ` zhong jiang
2019-10-18 16:07 ` Alexander Duyck
2019-10-21 15:11 ` zhong jiang
2019-10-21 12:57 ` Vlastimil Babka
2019-10-21 13:47 ` zhong jiang
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