diff options
Diffstat (limited to 'include/asm-s390/spinlock.h')
| -rw-r--r-- | include/asm-s390/spinlock.h | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/include/asm-s390/spinlock.h b/include/asm-s390/spinlock.h index 273dbecf8ac..ce3edf6d63b 100644 --- a/include/asm-s390/spinlock.h +++ b/include/asm-s390/spinlock.h @@ -11,17 +11,36 @@ #ifndef __ASM_SPINLOCK_H #define __ASM_SPINLOCK_H +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) + +static inline int +_raw_compare_and_swap(volatile unsigned int *lock, + unsigned int old, unsigned int new) +{ + asm volatile( + " cs %0,%3,%1" + : "=d" (old), "=Q" (*lock) + : "0" (old), "d" (new), "Q" (*lock) + : "cc", "memory" ); + return old; +} + +#else /* __GNUC__ */ + static inline int _raw_compare_and_swap(volatile unsigned int *lock, unsigned int old, unsigned int new) { - asm volatile ("cs %0,%3,0(%4)" - : "=d" (old), "=m" (*lock) - : "0" (old), "d" (new), "a" (lock), "m" (*lock) - : "cc", "memory" ); + asm volatile( + " cs %0,%3,0(%4)" + : "=d" (old), "=m" (*lock) + : "0" (old), "d" (new), "a" (lock), "m" (*lock) + : "cc", "memory" ); return old; } +#endif /* __GNUC__ */ + /* * Simple spin lock operations. There are two variants, one clears IRQ's * on the local processor, one does not. |