linux-kernel - Re: [PATCH 13/16] percpu: remove per_cpu_

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Date:	Mon, 19 Oct 2009 15:40:55 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Tejun Heo <tj@...nel.org>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	mingo@...hat.com, Thomas Gleixner <tglx@...utronix.de>,
	akpm@...ux-foundation.org, rostedt@...dmis.org, hpa@...or.com,
	cebbert@...hat.com, tony.luck@...el.com
Subject: Re: [PATCH 13/16] percpu: remove per_cpu__ prefix.

Tejun Heo wrote:
> (microblaze maintainer cc'd, hello)
> 
> Christoph Lameter wrote:
>> On Wed, 14 Oct 2009, Tejun Heo wrote:
>>
>>> @@ -39,7 +39,7 @@ extern void *per_cpu_init(void);
>>>   * On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly
>>>   * more efficient.
>>>   */
>>> -#define __ia64_per_cpu_var(var)	per_cpu__##var
>>> +#define __ia64_per_cpu_var(var)	var
>> IA64 could completely drop the macro? Tony?
> 
> Being discussed but I think we should just add sparse annotation there
> instead.
> 
>>> diff --git a/arch/microblaze/include/asm/entry.h b/arch/microblaze/include/asm/entry.h
>>> index 61abbd2..ec89f2a 100644
>>> --- a/arch/microblaze/include/asm/entry.h
>>> +++ b/arch/microblaze/include/asm/entry.h
>>> @@ -21,7 +21,7 @@
>>>   * places
>>>   */
>>>
>>> -#define PER_CPU(var) per_cpu__##var
>>> +#define PER_CPU(var) var
>> Microblaze too.
> 
> This macro is used only in assemblies which wouldn't be covered by
> sparse so in this case this patch series actually removes protection,
> so I wasn't too sure about ripping the macro off.  Any ideas what we
> can do here?  Just kill it?

If I understand correctly, functionality will be the same. But anyway I would
like to mot lose information about per_cpu variables. That's why please keep
that macro for Microblaze. If is the problem, you should convince me why to do it.

Thanks,
Michal






-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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