On Sun, Aug 12, 2007 at 10:54:51AM -0400, Mathieu Desnoyers wrote:
> Use the standard __cmpxchg for every type that can be updated atomically.
> Use the new generic cmpxchg_local (disables interrupt) for other types.
>
> Signed-off-by: Mathieu Desnoyers <[email protected]>
> CC: [email protected]
> CC: [email protected]
> CC: [email protected]
> ---
> include/asm-s390/system.h | 34 ++++++++++++++++++++++++++++++++++
> 1 file changed, 34 insertions(+)
>
> Index: linux-2.6-lttng/include/asm-s390/system.h
> ===================================================================
> --- linux-2.6-lttng.orig/include/asm-s390/system.h 2007-08-10 16:16:21.000000000 -0400
> +++ linux-2.6-lttng/include/asm-s390/system.h 2007-08-10 19:35:46.000000000 -0400
> @@ -353,6 +353,40 @@ __cmpxchg(volatile void *ptr, unsigned l
>
> #include <linux/irqflags.h>
>
> +#include <asm-generic/cmpxchg-local.h>
> +
> +static inline unsigned long __cmpxchg_local(volatile void *ptr,
> + unsigned long old,
> + unsigned long new, int size)
> +{
> + switch (size) {
> + case 1:
> + case 2:
> + case 4:
> +#ifdef __s390x__
> + case 8:
> +#endif
> + return __cmpxchg(ptr, old, new, size);
> + default:
> + return __cmpxchg_local_generic(ptr, old, new, size);
> + }
> +
> + return old;
> +}
> +
> +/*
> + * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
> + * them available.
> + */
> +#define cmpxchg_local(ptr,o,n) \
> + (__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
> + (unsigned long)(n), sizeof(*(ptr)))
> +#ifdef __s390x__
> +#define cmpxchg64_local(ptr,o,n) cmpxchg_local((ptr),(o),(n))
> +#else
> +#define cmpxchg64_local(ptr,o,n) __cmpxchg64_local_generic((ptr), (o), (n))
> +#endif
> +
What's the reason to have cmpxchg64_local on 32 bit architectures?
Without that need all this would just be a few simple defines.
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