linux-kernel - Re: [PATCH 00/10] percpu: Per cpu code simplification V3

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Date:	Tue, 08 Jan 2008 08:27:49 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] percpu: Per cpu code simplification V3

Ingo Molnar wrote:
> * travis@....com <travis@....com> wrote:
> 
>> This patchset simplifies the code that arches need to maintain to 
>> support per cpu functionality. Most of the code is moved into arch 
>> independent code. Only a minimal set of definitions is kept for each 
>> arch.
>>
>> The patch also unifies the x86 arch so that there is only a single 
>> asm-x86/percpu.h
>>
>> V1->V2:
>> - Add support for specifying attributes for per cpu declarations (preserves
>>   IA64 model(small) attribute).
>>   - Drop first patch that removes the model(small) attribute for IA64
>>   - Missing #endif in powerpc generic config /  Wrong Kconfig
>>   - Follow Randy's suggestions on how to do the Kconfig settings
>>
>> V2->V3:
>>   - fix x86_64 non-SMP case
>>   - change SHIFT_PTR to SHIFT_PERCPU_PTR
>>   - fix various percpu_modcopy()'s to reference correct per_cpu_offset()
>>   - s390 has a special way to determine the pointer to a per cpu area
> 
> thanks, i've picked up the x86 and core bits, for testing.
> 
> i had the patch below for v2, it's still needed (because i didnt apply 
> the s390/etc. bits), right?
> 
> 	Ingo

Yes, good point.  Thanks.

Mike

> 
> ------------->
> Subject: x86: let other arches build
> From: Ingo Molnar <mingo@...e.hu>
> 
> let architectures which still have the DEFINE_PER_CPU/etc. build
> properly.
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  include/linux/percpu.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: linux-x86.q/include/linux/percpu.h
> ===================================================================
> --- linux-x86.q.orig/include/linux/percpu.h
> +++ linux-x86.q/include/linux/percpu.h
> @@ -14,6 +14,7 @@
>  #endif
>  
>  #ifdef CONFIG_SMP
> +#ifndef DEFINE_PER_CPU
>  #define DEFINE_PER_CPU(type, name)					\
>  	__attribute__((__section__(".data.percpu")))			\
>  	PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
> @@ -32,6 +33,7 @@
>  
>  #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
>  #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
> +#endif
>  
>  /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
>  #ifndef PERCPU_ENOUGH_ROOM

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