From: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Date: Tue, 1 Oct 2013 19:04:10 +0000 (+0530)
Subject: powerpc/sysfs: Disable writing to PURR in guest mode
X-Git-Tag: v3.12-rc4~24^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1211af3049f4c9c1d8d4eb8f8098cc4f4f0d0c7;p=pandora-kernel.git

powerpc/sysfs: Disable writing to PURR in guest mode

arch/powerpc/kernel/sysfs.c exports PURR with write permission.
This may be valid for kernel in phyp mode. But writing to
the file in guest mode causes crash due to a priviledge violation

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
---

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