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ARM: 7408/1: cacheflush: return error to userspace when flushing syscall fails

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The cacheflush syscall can fail for two reasons:

(1) The arguments are invalid (nonsensical address range or no VMA)

(2) The region generates a translation fault on a VIPT or PIPT cache

This patch allows do_cache_op to return an error code to userspace in
the case of the above. The various coherent_user_range implementations
are modified to return 0 in the case of VIVT caches or -EFAULT in the
case of an abort on v6/v7 cores.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
2012-04-27 13:08:53 +01:00
committed by Russell King
parent 435a7ef52d
commit c5102f5935
20 changed files with 35 additions and 26 deletions
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1
arch/arm/mm/cache-v3.S
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@@ -78,6 +78,7 @@ ENTRY(v3_coherent_kern_range)
* - end - virtual end address
*/
ENTRY(v3_coherent_user_range)
mov r0, #0
mov pc, lr
/*