From: Will Deacon <will.deacon@arm.com>
Date: Thu, 28 Feb 2013 16:48:40 +0000 (+0100)
Subject: ARM: 7661/1: mm: perform explicit branch predictor maintenance when required
X-Git-Tag: v3.9-rc2~17^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89c7e4b8bbb3d4fa52df5746a8ad38e610143651;p=pandora-kernel.git

ARM: 7661/1: mm: perform explicit branch predictor maintenance when required

The ARM ARM requires branch predictor maintenance if, for a given ASID,
the instructions at a specific virtual address appear to change.

From the kernel's point of view, that means:

	- Changing the kernel's view of memory (e.g. switching to the
	  identity map)
	- ASID rollover (since ASIDs will be re-allocated to new tasks)

This patch adds explicit branch predictor maintenance when either of the
two conditions above are met.

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>
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