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: NCliff Wickman <cpw@sgi.com> Cc: <stable@vger.kernel.org> # 3.12.x Link: http://lkml.kernel.org/r/E1VnzBi-0005yF-MU@eag09.americas.sgi.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
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