diff mbox series

[019/143] khugepaged: use helper khugepaged_test_exit() in __khugepaged_enter()

Message ID 20210505013343.qetqCkfj-%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/143] mm: introduce and use mapping_empty() | expand

Commit Message

Andrew Morton May 5, 2021, 1:33 a.m. UTC 
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: khugepaged: use helper khugepaged_test_exit() in __khugepaged_enter()

Commit 4d45e75a9955 ("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>
---

 mm/khugepaged.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

--- a/mm/khugepaged.c~khugepaged-use-helper-khugepaged_test_exit-in-__khugepaged_enter
+++ a/mm/khugepaged.c
@@ -481,7 +481,7 @@  int __khugepaged_enter(struct mm_struct
 		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;