linux-kernel - Re: [PATCH 5/6] powerpc: Use generic per cpu linux-2.6.git

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Date:	Wed, 30 Jan 2008 10:38:57 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 5/6] powerpc: Use generic per cpu linux-2.6.git

Ingo Molnar wrote:
> * travis@....com <travis@....com> wrote:
> 
>> Powerpc has a way to determine the address of the per cpu area of the 
>> currently executing processor via the paca and the array of per cpu 
>> offsets is avoided by looking up the per cpu area from the remote 
>> paca's (copying x86_64).
> 
> i needed the fix below to get my powerpc crosscompile build to succeed.
> 
> 	Ingo

Thanks!  I double-checked the logs and my ppc build worked.  But yes, this was
in the original patch.  And wierdly, powerpc was the only arch that had it
dropped.

-Mike
> 
> -------------->
> Subject: powerpc: percpu build fix
> From: Ingo Molnar <mingo@...e.hu>
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  include/asm-powerpc/percpu.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-x86.q/include/asm-powerpc/percpu.h
> ===================================================================
> --- linux-x86.q.orig/include/asm-powerpc/percpu.h
> +++ linux-x86.q/include/asm-powerpc/percpu.h
> @@ -13,7 +13,7 @@
>  #include <asm/paca.h>
>  
>  #define __per_cpu_offset(cpu) (paca[cpu].data_offset)
> -#define __my_cpu_offset() get_paca()->data_offset
> +#define __my_cpu_offset get_paca()->data_offset
>  #define per_cpu_offset(x) (__per_cpu_offset(x))
>  
>  #endif /* CONFIG_SMP */

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