1 #ifndef __ASM_SH_CMPXCHG_IRQ_H 2 #define __ASM_SH_CMPXCHG_IRQ_H 3 4 #include <linux/irqflags.h> 5 6 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) 7 { 8 unsigned long flags, retval; 9 10 local_irq_save(flags); 11 retval = *m; 12 *m = val; 13 local_irq_restore(flags); 14 return retval; 15 } 16 17 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) 18 { 19 unsigned long flags, retval; 20 21 local_irq_save(flags); 22 retval = *m; 23 *m = val & 0xff; 24 local_irq_restore(flags); 25 return retval; 26 } 27 28 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, 29 unsigned long new) 30 { 31 __u32 retval; 32 unsigned long flags; 33 34 local_irq_save(flags); 35 retval = *m; 36 if (retval == old) 37 *m = new; 38 local_irq_restore(flags); /* implies memory barrier */ 39 return retval; 40 } 41 42 #endif /* __ASM_SH_CMPXCHG_IRQ_H */ 43