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khugepaged: use helper khugepaged_test_exit() in __khugepaged_enter()

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Commit 4d45e75a99 ("mm: remove the now-unnecessary mmget_still_valid()
hack") have made khugepaged_test_exit() suitable for check mm->mm_users
against 0.  Use this helper here.

Link: https://lkml.kernel.org/r/20210306032947.35921-4-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-05-04 18:33:43 -07:00 committed by Linus Torvalds
parent 588d01f918
commit 28ff0a3c42
1 changed files with 1 additions and 1 deletions
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2
mm/khugepaged.c
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@ -481,7 +481,7 @@ int __khugepaged_enter(struct mm_struct *mm)
return -ENOMEM;
/* __khugepaged_exit() must not run from under us */
VM_BUG_ON_MM(atomic_read(&mm->mm_users) == 0, mm);
VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) {
free_mm_slot(mm_slot);
return 0;