From d1211af3049f4c9c1d8d4eb8f8098cc4f4f0d0c7 Mon Sep 17 00:00:00 2001
From: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Date: Wed, 2 Oct 2013 00:34:10 +0530
Subject: [PATCH] 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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Reading git-format-patch failed