1#ifndef _ASM_SCORE_CMPXCHG_H 2#define _ASM_SCORE_CMPXCHG_H 3 4#include <linux/irqflags.h> 5 6struct __xchg_dummy { unsigned long a[100]; }; 7#define __xg(x) ((struct __xchg_dummy *)(x)) 8 9static inline 10unsigned long __xchg(volatile unsigned long *m, unsigned long val) 11{ 12 unsigned long retval; 13 unsigned long flags; 14 15 local_irq_save(flags); 16 retval = *m; 17 *m = val; 18 local_irq_restore(flags); 19 return retval; 20} 21 22#define xchg(ptr, v) \ 23 ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr), \ 24 (unsigned long)(v))) 25 26static inline unsigned long __cmpxchg(volatile unsigned long *m, 27 unsigned long old, unsigned long new) 28{ 29 unsigned long retval; 30 unsigned long flags; 31 32 local_irq_save(flags); 33 retval = *m; 34 if (retval == old) 35 *m = new; 36 local_irq_restore(flags); 37 return retval; 38} 39 40#define cmpxchg(ptr, o, n) \ 41 ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \ 42 (unsigned long)(o), \ 43 (unsigned long)(n))) 44 45#define __HAVE_ARCH_CMPXCHG 1 46 47#include <asm-generic/cmpxchg-local.h> 48 49#endif /* _ASM_SCORE_CMPXCHG_H */ 50