x86: prevent dereferencing non-allocated per_cpu variables
'for_each_possible_cpu(i)' when there's a _remote possibility_ of dereferencing a non-allocated per_cpu variable involved. All files except mm/vmstat.c are x86 arch. Thanks to pageexec@freemail.hu for pointing this out. Signed-off-by: Mike Travis <travis@sgi.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: <pageexec@freemail.hu> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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