linux-kernel - [PATCH 3/5] khugepaged: use helper khugepaged_test_exit() in __khugepaged

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Date:   Thu, 4 Mar 2021 07:30:11 -0500
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <riel@...hat.com>, <kirill.shutemov@...ux.intel.com>,
        <ebru.akagunduz@...il.com>, <dan.carpenter@...cle.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 3/5] 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.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/khugepaged.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 287e7ecf978c..e886a8618c33 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -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;
-- 
2.19.1