Re: [PATCH] percpu: remove address_space attribute if !SMP

From: Namhyung Kim
Date: Fri Aug 06 2010 - 08:53:32 EST

2010-08-06 (ê), 14:49 +0200, Tejun Heo:
> On 08/06/2010 02:46 PM, Namhyung Kim wrote:
> > percpu data has no special meaning in case of !CONFIG_SMP.
> > This removes lots of sparse warnings.
> >
> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
> But they should still be accessed through the accessors and if they
> are accessed through accessors, there shouldn't be sparse warnings
> regarding them. Maybe UP accessors are missing proper markups? Do
> those warnings only happen on UP config?

They do nothing on UP.
quoting from include/asm-generic.h:

#else /* ! SMP */

#define per_cpu(var, cpu) (*((void)(cpu), &(var)))
#define __get_cpu_var(var) (var)
#define __raw_get_cpu_var(var) (var)
#define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)

#endif /* SMP */

Namhyung Kim

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