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Reorganize for better readability. * Accessor definitions are collected into one place and SMP and UP now define them in the same order. * Definitions are layered when possible - e.g. per_cpu() is now defined in terms of this_cpu_ptr(). * Rather pointless comment dropped. * per_cpu(), __raw_get_cpu_var() and __get_cpu_var() are defined in a way which can be shared between SMP and UP and moved out of CONFIG_SMP blocks. This patch doesn't introduce any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux-foundation.org>