[patch] powerpc: smp_wmb lwsync optimisation fix

[Kumar Gala]

On Nov 1, 2008, at 7:33 AM, Nick Piggin wrote:

> A previous change removed __SUBARCH_HAS_LWSYNC define, and replaced it
> with __powerpc64__. smp_wmb() seems to be the last place not updated.

Uugh... no.. I missed the patch that removed __SUBARCH_HAS_LWSYNC, but  
thats no good.  We have LWSYNC on non-powerpc64 machines.  Will go  
figure out who forgets we have ppc32 machines :)

- k

>
>
> Signed-off-by: Nick Piggin <npiggin at suse.de>
> ---
> Index: linux-2.6/arch/powerpc/include/asm/system.h
> ===================================================================
> --- linux-2.6.orig/arch/powerpc/include/asm/system.h	2008-11-01  
> 20:31:51.000000000 +1100
> +++ linux-2.6/arch/powerpc/include/asm/system.h	2008-11-01  
> 20:32:33.000000000 +1100
> @@ -44,7 +44,7 @@
> #define AT_VECTOR_SIZE_ARCH 6 /* entries in ARCH_DLINFO */
> #ifdef CONFIG_SMP
>
> -#ifdef __SUBARCH_HAS_LWSYNC
> +#if defined(__powerpc64__)
> #    define SMPWMB      lwsync
> #else
> #    define SMPWMB      eieio
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