On Wed, 2008-05-21 at 16:10 +0200, Nick Piggin wrote:
> Hi,
>
> I'm sure I've sent these patches before, but I can't remember why they
> weren't merged. They still seem obviously correct to me.
We should already do all that's needed in our IO accessors no ?
> --
>
> lwsync is explicitly defined not to have any effect on the ordering of
> accesses to device memory, so it cannot be used for rmb(). sync appears
> to be the only barrier which fits the bill.
>
> Signed-off-by: Nick Piggin <[EMAIL PROTECTED]>
> ---
> Index: linux-2.6/include/asm-powerpc/system.h
> ===================================================================
> --- linux-2.6.orig/include/asm-powerpc/system.h
> +++ linux-2.6/include/asm-powerpc/system.h
> @@ -34,7 +34,7 @@
> * SMP since it is only used to order updates to system memory.
> */
> #define mb() __asm__ __volatile__ ("sync" : : : "memory")
> -#define rmb() __asm__ __volatile__ (__stringify(LWSYNC) : : : "memory")
> +#define rmb() __asm__ __volatile__ ("sync" : : : "memory")
> #define wmb() __asm__ __volatile__ ("sync" : : : "memory")
> #define read_barrier_depends() do { } while(0)
>
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