From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 20 Aug 2010 23:49:40 +0000 (-0700)
Subject: mm: make stack guard page logic use vm_prev pointer
X-Git-Tag: v2.6.36-rc2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e8e50e20c837eeec8323bba7dcd25fe5479194c;p=pandora-kernel.git

mm: make stack guard page logic use vm_prev pointer

Like the mlock() change previously, this makes the stack guard check
code use vma->vm_prev to see what the mapping below the current stack
is, rather than have to look it up with find_vma().

Also, accept an abutting stack segment, since that happens naturally if
you split the stack with mlock or mprotect.

Tested-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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