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From: Yang Shi <yang.shi@linux.alibaba.com>
To: akpm@linux-foundation.org
Cc: yang.shi@linux.alibaba.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: [RFC PATCH 5/8] ipc: shm: pass atomic parameter to do_munmap()
Date: Wed, 21 Mar 2018 05:31:23 +0800	[thread overview]
Message-ID: <1521581486-99134-6-git-send-email-yang.shi@linux.alibaba.com> (raw)
In-Reply-To: <1521581486-99134-1-git-send-email-yang.shi@linux.alibaba.com>

It looks safe to do unlock/relock mmap_sem in the middle of shmat(), so
passing "false" here.

Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
 ipc/shm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index 4643865..1617523 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1537,7 +1537,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 			 */
 			file = vma->vm_file;
 			size = i_size_read(file_inode(vma->vm_file));
-			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
+			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start,
+				  NULL, false);
 			/*
 			 * We discovered the size of the shm segment, so
 			 * break out of here and fall through to the next
@@ -1564,7 +1565,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 		if ((vma->vm_ops == &shm_vm_ops) &&
 		    ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
 		    (vma->vm_file == file))
-			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
+			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start,
+				  NULL, false);
 		vma = next;
 	}
 
@@ -1573,7 +1575,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 	 * given
 	 */
 	if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
-		do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
+		do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start,
+			  NULL, false);
 		retval = 0;
 	}
 
-- 
1.8.3.1

  parent reply	other threads:[~2018-03-20 21:32 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-20 21:31 [RFC PATCH 0/8] Drop mmap_sem during unmapping large map Yang Shi
2018-03-20 21:31 ` [RFC PATCH 1/8] mm: mmap: unmap large mapping by section Yang Shi
2018-03-21 13:08   ` Michal Hocko
2018-03-21 16:31     ` Yang Shi
2018-03-21 17:29       ` Matthew Wilcox
2018-03-21 21:45         ` Yang Shi
2018-03-21 22:15           ` Matthew Wilcox
2018-03-21 22:40             ` Yang Shi
2018-03-21 22:46           ` Matthew Wilcox
2018-03-22 15:32             ` Laurent Dufour
2018-03-22 15:40               ` Matthew Wilcox
2018-03-22 15:54                 ` Laurent Dufour
2018-03-22 16:05                   ` Matthew Wilcox
2018-03-22 16:18                     ` Laurent Dufour
2018-03-22 16:46                       ` Yang Shi
2018-03-23 13:03                         ` Laurent Dufour
2018-03-22 16:51                       ` Matthew Wilcox
2018-03-22 16:49                     ` Yang Shi
2018-03-22 17:34         ` Yang Shi
2018-03-22 18:48           ` Matthew Wilcox
2018-03-24 18:24         ` Jerome Glisse
2018-03-21 13:14   ` Michal Hocko
2018-03-21 16:50     ` Yang Shi
2018-03-21 17:16       ` Yang Shi
2018-03-21 21:23         ` Michal Hocko
2018-03-21 22:36           ` Yang Shi
2018-03-22  9:10             ` Michal Hocko
2018-03-22 16:06               ` Yang Shi
2018-03-22 16:12                 ` Michal Hocko
2018-03-22 16:13                 ` Matthew Wilcox
2018-03-22 16:28                   ` Laurent Dufour
2018-03-22 16:36                     ` David Laight
2018-03-20 21:31 ` [RFC PATCH 2/8] mm: mmap: pass atomic parameter to do_munmap() call sites Yang Shi
2018-03-20 21:31 ` [RFC PATCH 3/8] mm: mremap: pass atomic parameter to do_munmap() Yang Shi
2018-03-20 21:31 ` [RFC PATCH 4/8] mm: nommu: add " Yang Shi
2018-03-20 21:31 ` Yang Shi [this message]
2018-03-20 21:31 ` [RFC PATCH 6/8] fs: proc/vmcore: pass " Yang Shi
2018-03-20 21:31 ` [RFC PATCH 7/8] x86: mpx: " Yang Shi
2018-03-20 22:35   ` Thomas Gleixner
2018-03-21 16:53     ` Yang Shi
2018-03-20 21:31 ` [RFC PATCH 8/8] x86: vma: " Yang Shi

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