From: James Bottomley <JBottomley@Parallels.com>
Date: Wed, 16 May 2012 10:10:27 +0000 (+0100)
Subject: fix panic on prefetch(NULL) on PA7300LC
X-Git-Tag: v3.2.19~104
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1769176aefab1db270cf1b10aca2a1a0a5dfb71;p=pandora-kernel.git

fix panic on prefetch(NULL) on PA7300LC

commit b3cb8674811d1851bbf1486a73d62b90c119b994 upstream.

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.

Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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