From 3eae49ca8954f958b2001ab5643ef302cb7b67c7 Mon Sep 17 00:00:00 2001
From: cpw <cpw@sgi.com>
Date: Tue, 3 Dec 2013 17:15:30 -0600
Subject: [PATCH] x86/UV: Fix NULL pointer dereference in uv_flush_tlb_others()
 if the 'nobau' boot option is used

The SGI UV tlb shootdown code panics the system with a NULL
pointer deference if 'nobau' is specified on the boot
commandline.

uv_flush_tlb_other() gets called for every flush, whether the
BAU is disabled or not.  It should not be keeping the s_enters
statistic while the BAU is disabled.

The panic occurs because during initialization
init_per_cpu_tunables() does not set the bcp->statp pointer if
'nobau' was specified.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: <stable@vger.kernel.org> # 3.12.x
Link: http://lkml.kernel.org/r/E1VnzBi-0005yF-MU@eag09.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
Reading git-format-patch failed