tree 888332340ca07cbd2a648fa603b8b252af02252a
parent 435a7ef52db7d86e67a009b36cac1457f8972391
author Will Deacon <will.deacon@arm.com> 1335528533 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1335953569 +0100

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

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>