tree 2679cd18aab608967178492a3958f9eddcbc2750
parent f0915781bd5edf78b1154e61efe962dc15872d09
author Will Deacon <will.deacon@arm.com> 1369330158 +0100
committer Will Deacon <will.deacon@arm.com> 1376306744 +0100

ARM: tlb: don't bother with barriers for branch predictor maintenance

Branch predictor maintenance is only required when we are either
changing the kernel's view of memory (switching tables completely) or
dealing with ASID rollover.

Both of these use-cases require subsequent TLB invalidation, which has
the relevant barrier instructions to ensure completion and visibility
of the maintenance, so this patch removes the instruction barrier from
[local_]flush_bp_all.

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