linux-kernel - [RFC PATCH 1/5] mm: call vm_munmap in munmap syscall instead of using open coded version

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Message-Id: <1485265923-20256-2-git-send-email-rppt@linux.vnet.ibm.com>
Date:   Tue, 24 Jan 2017 15:51:59 +0200
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Linux-MM <linux-mm@...ck.org>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>
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 <rppt@...ux.vnet.ibm.com>
---
 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;
-
 	profile_munmap(addr);
-	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);
 }
 
 
-- 
1.9.1