From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 19 Oct 2012 20:37:57 +0000 (-0700)
Subject: remap_file_pages: correctly handle the case of a NULL vm_ops pointer
X-Git-Tag: v3.7-rc2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=deb521c44fa529b24cc78a64702757a683f82487;p=pandora-kernel.git

remap_file_pages: correctly handle the case of a NULL vm_ops pointer

In commit 0b173bc4daa8 ("mm: kill vma flag VM_CAN_NONLINEAR") we
replaced the VM_CAN_NONLINEAR test with checking whether the mapping has
a '->remap_pages()' vm operation, but there is no guarantee that there
it even has a vm_ops pointer at all.

Add the appropriate test for NULL vm_ops.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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