linux-kernel - [PATCH] mm/mmap.c: use helper mlock_future

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Date:   Sat, 2 Apr 2022 11:22:31 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm/mmap.c: use helper mlock_future_check()

Use helper mlock_future_check() to check whether it's safe to enlarge the
locked_vm to simplify the code.  Minor readability improvement.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/mmap.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index d62598dc2fdd..36914ef6f338 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2348,15 +2348,8 @@ static int acct_stack_growth(struct vm_area_struct *vma,
 		return -ENOMEM;
 
 	/* mlock limit tests */
-	if (vma->vm_flags & VM_LOCKED) {
-		unsigned long locked;
-		unsigned long limit;
-		locked = mm->locked_vm + grow;
-		limit = rlimit(RLIMIT_MEMLOCK);
-		limit >>= PAGE_SHIFT;
-		if (locked > limit && !capable(CAP_IPC_LOCK))
-			return -ENOMEM;
-	}
+	if (mlock_future_check(mm, vma->vm_flags, grow << PAGE_SHIFT))
+		return -ENOMEM;
 
 	/* Check to ensure the stack will not grow into a hugetlb-only region */
 	new_start = (vma->vm_flags & VM_GROWSUP) ? vma->vm_start :
-- 
2.23.0