tree c32b9ec35578f84705af2339941f41ecdfd4d4e0
parent 2c813980c6113ac2c407fbed99f53242088c3038
author Will Deacon <will.deacon@arm.com> 1368205639 +0100
committer Will Deacon <will.deacon@arm.com> 1376306744 +0100

ARM: barrier: allow options to be passed to memory barrier instructions

On ARMv7, the memory barrier instructions take an optional `option'
field which can be used to constrain the effects of a memory barrier
based on shareability and access type.

This patch allows the caller to pass these options if required, and
updates the smp_*() barriers to request inner-shareable barriers,
affecting only stores for the _wmb variant. wmb() is also changed to
use the -st version of dsb.

Reported-by: Albin Tonnerre <albin.tonnerre@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>