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 CC: clameter@sgi.com CC: schwidefsky@de.ibm.com CC: linux390@de.ibm.com --- include/asm-s390/system.h | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-) Index: linux-2.6-lttng/include/asm-s390/system.h =================================================================== --- linux-2.6-lttng.orig/include/asm-s390/system.h 2007-10-31 17:32:43.000000000 -0400 +++ linux-2.6-lttng/include/asm-s390/system.h 2007-10-31 18:26:02.000000000 -0400 @@ -201,9 +201,9 @@ static inline unsigned long __xchg(unsig #define __HAVE_ARCH_CMPXCHG 1 -#define cmpxchg(ptr,o,n)\ - ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ - (unsigned long)(n),sizeof(*(ptr)))) +#define cmpxchg(ptr, o, n) \ + ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \ + (unsigned long)(n), sizeof(*(ptr)))) extern void __cmpxchg_called_with_bad_pointer(void); @@ -355,6 +355,44 @@ __cmpxchg(volatile void *ptr, unsigned l #include +#include + +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) \ + ({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + cmpxchg_local((ptr), (o), (n)); \ + }) +#else +#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) +#endif + /* * Use to set psw mask except for the first byte which * won't be changed by this function. -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/