module: encapsulate percpu handling better and record percpu_size
Better encapsulate module static percpu area handling so that code outsidef of CONFIG_SMP ifdef doesn't deal with mod->percpu directly and add mod->percpu_size and record percpu_size in it. Both percpu fields are compiled out on UP. While at it, mark mod->percpu w/ __percpu. This is to prepare for is_module_percpu_address(). Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NRusty Russell <rusty@rustcorp.com.au>
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