From 8786ed5f8a0dbd6fea585ce69fdd9b840388e458 Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@arm.com>
Date: Fri, 10 Aug 2012 19:13:36 +0100
Subject: [PATCH] ARM: 7489/1: errata: fix workaround for erratum #720789 on UP
 systems

commit 730a8128cd8978467eb1cf546b11014acb57d433 upstream.

Commit 5a783cbc4836 ("ARM: 7478/1: errata: extend workaround for erratum
 #720789") added workarounds for erratum #720789 to the range TLB
invalidation functions with the observation that the erratum only
affects SMP platforms. However, when running an SMP_ON_UP kernel on a
uniprocessor platform we must take care to preserve the ASID as the
workaround is not required.

This patch ensures that we don't set the ASID to 0 when flushing the TLB
on such a system, preserving the original behaviour with the workaround
disabled.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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