From: Will Deacon <will.deacon@arm.com>
Date: Wed, 12 Jun 2013 11:25:56 +0000 (+0100)
Subject: ARM: 7757/1: mm: don't flush icache in switch_mm with hardware broadcasting
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~41^2~1^3~10
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=621a0147d5c921f4cc33636ccd0602ad5d7cbfbc;p=pandora-kernel.git

ARM: 7757/1: mm: don't flush icache in switch_mm with hardware broadcasting

When scheduling an mm on a CPU where it hasn't previously been used, we
flush the icache on that CPU so that any code loaded previously on
a different core can be safely executed.

For cores with hardware broadcasting of cache maintenance operations,
this is clearly unnecessary, since the inner-shareable invalidation in
__sync_icache_dcache will affect all CPUs.

This patch conditionalises the icache flush in switch_mm based on
cache_ops_need_broadcast().

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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>
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