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authorNicolas Pitre <nico@fluxnic.net>2010-06-07 16:28:55 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-06-08 14:25:50 -0400
commit17ebba1fe4da4b5d62782be8743e0e8231812af9 (patch)
treeaef818d66f5dbe04817b88b8d0351035740118ba /arch/arm/mach-shark/leds.c
parentb394eebdd3d436f1796e53b97799554c5aa77431 (diff)
ARM: 6165/1: trap overflows on highmem pages from kmap_atomic when debugging
When CONFIG_DEBUG_HIGHMEM is used, the fixmap entry used for a highmem page by kmap_atomic() is always cleared by kunmap_atomic(). This helps find bad usages such as dereferences after the unmap, or overflow into the adjacent fixmap areas. But this debugging aid is completely bypassed when a kmap for the same page already exists as the kmap is reused instead. ON VIVT systems we have no choice but to reuse that kmap due to cache coherency issues, but on non VIVT systems we should always force the fixmap usage when debugging is active. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-shark/leds.c')
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