From: James Bottomley <JBottomley@Parallels.com>
Date: Wed, 16 May 2012 10:10:27 +0000 (+0100)
Subject: [PARISC] fix panic on prefetch(NULL) on PA7300LC
X-Git-Tag: v3.4~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3cb8674811d1851bbf1486a73d62b90c119b994;p=pandora-kernel.git

[PARISC] fix panic on prefetch(NULL) on PA7300LC

Due to an errata, the PA7300LC generates a TLB miss interruption even on the
prefetch instruction.  This means that prefetch(NULL), which is supposed to be
a nop on linux actually generates a NULL deref fault.  Fix this by testing the
address of prefetch against NULL before doing the prefetch.

Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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