linux-kernel - [RFC PATCH 6/8] fs: proc/vmcore: pass atomic parameter to do

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Date:   Wed, 21 Mar 2018 05:31:24 +0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     akpm@...ux-foundation.org
Cc:     yang.shi@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 6/8] fs: proc/vmcore: pass atomic parameter to do_munmap()

Just pass "true" here since vmcore map is not a hot path there is not
too much gain to release mmap_sem in the middle.

Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
---
 fs/proc/vmcore.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index a45f0af..02683eb 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -388,7 +388,7 @@ static int remap_oldmem_pfn_checked(struct vm_area_struct *vma,
 	}
 	return 0;
 fail:
-	do_munmap(vma->vm_mm, from, len, NULL);
+	do_munmap(vma->vm_mm, from, len, NULL, true);
 	return -EAGAIN;
 }
 
@@ -481,7 +481,7 @@ static int mmap_vmcore(struct file *file, struct vm_area_struct *vma)
 
 	return 0;
 fail:
-	do_munmap(vma->vm_mm, vma->vm_start, len, NULL);
+	do_munmap(vma->vm_mm, vma->vm_start, len, NULL, true);
 	return -EAGAIN;
 }
 #else
-- 
1.8.3.1