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Date:   Tue, 24 Jan 2017 15:51:59 +0200
From:   Mike Rapoport <>
To:     Linux-MM <>
Cc:     Andrea Arcangeli <>,
        Andrew Morton <>,
        "Dr. David Alan Gilbert" <>,
        Hillf Danton <>,
        Mike Kravetz <>,
        Pavel Emelyanov <>,
        LKML <>,
        Mike Rapoport <>
Subject: [RFC PATCH 1/5] mm: call vm_munmap in munmap syscall instead of using open coded version

The commit dc0ef0df7b6a (mm: make mmap_sem for write waits killable for mm
syscalls) replaced call to vm_munmap in munmap syscall with open coded
version to allow different waits on mmap_sem in munmap syscall and
vm_munmap. Now both functions use down_write_killable, so we can restore
the call to vm_munmap from the munmap system call.

Signed-off-by: Mike Rapoport <>
 mm/mmap.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index b729084..f040ea0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2680,15 +2680,8 @@ int vm_munmap(unsigned long start, size_t len)
 SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
-	int ret;
-	struct mm_struct *mm = current->mm;
-	if (down_write_killable(&mm->mmap_sem))
-		return -EINTR;
-	ret = do_munmap(mm, addr, len);
-	up_write(&mm->mmap_sem);
-	return ret;
+	return vm_munmap(addr, len);

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