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authorWill Deacon <will.deacon@arm.com>2010-09-13 17:19:41 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-04 21:57:10 +0200
commitc4e259c859538e94007d1f04a488540375189551 (patch)
treedf5485bd1184c562a11a8588915539d136e8de29 /arch/arm/mach-dove/include/mach
parentARM: 6385/1: setup: detect aliasing I-cache when D-cache is non-aliasing (diff)
downloadlinux-c4e259c859538e94007d1f04a488540375189551.tar.xz
linux-c4e259c859538e94007d1f04a488540375189551.zip
ARM: 6386/1: flush_ptrace_access: invalidate correct I-cache alias
copy_to_user_page can be used by access_process_vm to write to an executable page of a process using a mapping acquired by kmap. For systems with I-cache aliasing, flushing the I-cache using the Kernel mapping may leave stale data in the I-cache if the user mapping is of a different colour. This patch introduces a flush_icache_alias function to flush.c, which calls flush_icache_range with a mapping of the specified colour. flush_ptrace_access is then modified to call this new function instead of coherent_kern_range in the case of an aliasing I-cache and a non-aliasing D-cache. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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