From: David Howells <dhowells@redhat.com>
Date: Sat, 16 Jan 2010 01:01:34 +0000 (-0800)
Subject: nommu: remove a superfluous check of vm_region::vm_usage
X-Git-Tag: v2.6.33-rc5~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=779c10232ceb11c1b259232c4845cfb2850287b7;p=pandora-kernel.git

nommu: remove a superfluous check of vm_region::vm_usage

In split_vma(), there's no need to check if the VMA being split has a
region that's in use by more than one VMA because:

 (1) The preceding test prohibits splitting of non-anonymous VMAs and regions
     (eg: file or chardev backed VMAs).

 (2) Anonymous regions can't be mapped multiple times because there's no handle
     by which to refer to the already existing region.

 (3) If a VMA has previously been split, then the region backing it has also
     been split into two regions, each of usage 1.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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