From: Joonsoo Kim <js1304@gmail.com>
Date: Wed, 12 Dec 2012 21:51:53 +0000 (-0800)
Subject: mm: WARN_ON_ONCE if f_op->mmap() change vma's start address
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~33^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2897b4d29d9fca82a57b09b8a216a5d604966e4b;p=pandora-kernel.git

mm: WARN_ON_ONCE if f_op->mmap() change vma's start address

During reviewing the source code, I found a comment which mention that
after f_op->mmap(), vma's start address can be changed.  I didn't verify
that it is really possible, because there are so many f_op->mmap()
implementation.  But if there are some mmap() which change vma's start
address, it is possible error situation, because we already prepare prev
vma, rb_link and rb_parent and these are related to original address.

So add WARN_ON_ONCE for finding that this situtation really happens.

Signed-off-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Reading git-diff-tree failed