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: Tejun Heo <tj@kernel.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
index 5e869ffd34aa..87d247ac6761 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -330,8 +330,11 @@ struct module
         struct module_notes_attrs *notes_attrs;
 #endif
 
+#ifdef CONFIG_SMP
         /* Per-cpu data. */
-        void *percpu;
+        void __percpu *percpu;
+        unsigned int percpu_size;
+#endif
 
         /* The command line arguments (may be mangled).  People like
            keeping pointers to this stuff */