linux-kernel - Re: [PATCH] percpu: add missing per_cpu_ptr_to

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Date:	Wed, 02 Dec 2009 08:38:05 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-next@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] percpu: add missing per_cpu_ptr_to_phys() definition
 for UP

Tejun Heo wrote:
> Commit 3b034b0d084221596bf35c8d893e1d4d5477b9cc implemented
> per_cpu_ptr_to_phys() but forgot to add UP definition.  Add UP
> definition which is simple wrapper around __pa().
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>

Yes, that builds now.  Thanks.

Acked-by: Randy Dunlap <randy.dunlap@...cle.com>


> ---
> Hello,
> 
>> drivers/base/cpu.c: line 100: fails to build when CONFIG_SMP=n:
>>
>> 	addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
>>
>> Can you suggest a fix for that, please?
> 
> Oops, right, UP definition was missing.  This patch should do it.
> 
> Thanks.
> 
>  include/linux/percpu.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/percpu.h b/include/linux/percpu.h
> index 6ac984f..8e4ead6 100644
> --- a/include/linux/percpu.h
> +++ b/include/linux/percpu.h
> @@ -180,6 +180,11 @@ static inline void free_percpu(void *p)
>  	kfree(p);
>  }
>  
> +static inline phys_addr_t per_cpu_ptr_to_phys(void *addr)
> +{
> +	return __pa(addr);
> +}
> +
>  static inline void __init setup_per_cpu_areas(void) { }
>  
>  static inline void *pcpu_lpage_remapped(void *kaddr)


-- 
~Randy
--
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