diff options
| author | Gary King <gking@nvidia.com> | 2010-07-29 17:37:20 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-30 23:16:07 +0100 |
| commit | 831e8047eb2af310184a9d4d9e749f3de119ae39 (patch) | |
| tree | f9fd2e3982796a50e2d2b9374c80ba0c1c4204bb /lib/swiotlb.c | |
| parent | b92b3612134faff171981fad4f0adb33f485e02e (diff) | |
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 'lib/swiotlb.c')
0 files changed, 0 insertions, 0 deletions