Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fe4130131ef9e55763fd634a02b1db9290dbbe5a Commit: fe4130131ef9e55763fd634a02b1db9290dbbe5a Parent: 85fdbe1b4b33b797321bfadf706b355e7cca6165 Author: Mathieu Desnoyers <[EMAIL PROTECTED]> AuthorDate: Thu Feb 7 00:16:24 2008 -0800 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Thu Feb 7 08:42:32 2008 -0800
Add cmpxchg_local to s390 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: Martin Schwidefsky <[EMAIL PROTECTED]> Cc: Heiko Carstens <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- include/asm-s390/system.h | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 files changed, 41 insertions(+), 3 deletions(-) diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h index 44bda78..15aba30 100644 --- a/include/asm-s390/system.h +++ b/include/asm-s390/system.h @@ -201,9 +201,9 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) #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 long old, unsigned long new, int size) #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) \ + ({ \ + 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. - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html