From: Soeren Sandmann <sandmann@daimi.au.dk>
Date: Wed, 28 Oct 2009 17:55:36 +0000 (+0100)
Subject: highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow
X-Git-Tag: v2.6.32-rc7~44^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ebd4c22897dce65845807a9bd3a31cc4e142b53;p=pandora-kernel.git

highmem: Fix race in debug_kmap_atomic() which could cause warn_count to underflow

debug_kmap_atomic() tries to prevent ever printing more than 10
warnings, but it does so by testing whether an unsigned integer
is equal to 0. However, if the warning is caused by a nested
IRQ, then this counter may underflow and the stream of warnings
will never end.

Fix that by using a signed integer instead.

Signed-off-by: Soeren Sandmann Pedersen <sandmann@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: a.p.zijlstra@chello.nl
Cc: <stable@kernel.org> # .31.x
LKML-Reference: <ye8zl7b8ktj.fsf@camel23.daimi.au.dk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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