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authorGary King <gking@nvidia.com>2010-07-29 17:37:20 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-07-30 23:16:07 +0100
commit831e8047eb2af310184a9d4d9e749f3de119ae39 (patch)
treef9fd2e3982796a50e2d2b9374c80ba0c1c4204bb /kernel/delayacct.c
parentb92b3612134faff171981fad4f0adb33f485e02e (diff)
downloadlinux-2.6.34-ux500-831e8047eb2af310184a9d4d9e749f3de119ae39.tar.gz
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>
Diffstat (limited to 'kernel/delayacct.c')
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