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mm: userfaultfd: use swap() in double_pt_lock()

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Use existing swap() function rather than duplicating its implementation.

./mm/userfaultfd.c:1006:13-14: WARNING opportunity for swap()

Link: https://lkml.kernel.org/r/20240531091643.67778-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=9266
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jiapeng Chong 2024-05-31 17:16:43 +08:00 committed by Andrew Morton
parent fe91eca680
commit 37a4b34ac9
1 changed files with 2 additions and 8 deletions
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10
mm/userfaultfd.c
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@ -995,14 +995,8 @@ void double_pt_lock(spinlock_t *ptl1,
__acquires(ptl1)
__acquires(ptl2)
{
spinlock_t *ptl_tmp;
if (ptl1 > ptl2) {
/* exchange ptl1 and ptl2 */
ptl_tmp = ptl1;
ptl1 = ptl2;
ptl2 = ptl_tmp;
}
if (ptl1 > ptl2)
swap(ptl1, ptl2);
/* lock in virtual address order to avoid lock inversion */
spin_lock(ptl1);
if (ptl1 != ptl2)