tree d3bb5504e13472fad2bdbb928b8a7cdfeee1c594
parent ca4744084772e1fee999391bee0fcdca5d91a757
author Will Deacon <will.deacon@arm.com> 1391796740 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1392032666 +0000

ARM: 7953/1: mm: ensure TLB invalidation is complete before enabling MMU

During __v{6,7}_setup, we invalidate the TLBs since we are about to
enable the MMU on return to head.S. Unfortunately, without a subsequent
dsb instruction, the invalidation is not guaranteed to have completed by
the time we write to the sctlr, potentially exposing us to junk/stale
translations cached in the TLB.

This patch reworks the init functions so that the dsb used to ensure
completion of cache/predictor maintenance is also used to ensure
completion of the TLB invalidation.

Cc: <stable@vger.kernel.org>
Reported-by: Albin Tonnerre <Albin.Tonnerre@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>