From: Gary King <gking@nvidia.com>
Date: Thu, 29 Jul 2010 16:37:20 +0000 (+0100)
Subject: ARM: 6279/1: highmem: fix SMP preemption bug in kmap_high_l1_vipt
X-Git-Tag: v2.6.35~2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=831e8047eb2af310184a9d4d9e749f3de119ae39;p=pandora-kernel.git

ARM: 6279/1: highmem: fix SMP preemption bug in kmap_high_l1_vipt

smp_processor_id() must not be called from a preemptible context (this
is checked by CONFIG_DEBUG_PREEMPT).  kmap_high_l1_vipt() was doing so.
This lead to a problem where the wrong per_cpu kmap_high_l1_vipt_depth
could be incremented, causing a BUG_ON(*depth <= 0); in
kunmap_high_l1_vipt().

The solution is to move the call to smp_processor_id() after the call
to preempt_disable().

Originally by: Andrew Howe <ahowe@nvidia.com>

Signed-off-by: Gary King <gking@nvidia.com>
Acked-by: Nicolas Pitre <nico.as.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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