Some read-mostly per-cpu data may need to be declared or defined
early, so it can be initialized and accessed before per_cpu
areas are allocated.

Only the data that resides in the per_cpu areas should be
read-mostly, as there is little benefit in optimizing cache
lines on initialization.
Signed-off-by: NIdo Yariv <ido@wizery.com>
[ Added the missing declarations in !SMP code. ]
Signed-off-by: NVlad Zolotarov <vlad@scalemp.com>
Acked-by: NShai Fultheim <shai@scalemp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/46188571.ddB8aVQYWo@vladSigned-off-by: NIngo Molnar <mingo@kernel.org>