linux-kernel - Re: [PATCH] percpu: remove address

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Date:	Fri, 06 Aug 2010 21:53:17 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] percpu: remove address_space attribute if !SMP

2010-08-06 (금), 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@...il.com>
> 
> 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 */


-- 
Regards,
Namhyung Kim


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