1 #ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H
2 #define __ASM_GENERIC_CMPXCHG_LOCAL_H
4 #include <linux/types.h>
5 #include <linux/irqflags.h>
7 extern unsigned long wrong_size_cmpxchg(volatile void *ptr)
11 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned
12 * long parameter, supporting various types of architectures.
14 static inline unsigned long __cmpxchg_local_generic(volatile void *ptr,
15 unsigned long old, unsigned long new, int size)
17 unsigned long flags, prev;
20 * Sanity checking, compile-time.
22 if (size == 8 && sizeof(unsigned long) != 8)
23 wrong_size_cmpxchg(ptr);
25 raw_local_irq_save(flags);
27 case 1: prev = *(u8 *)ptr;
31 case 2: prev = *(u16 *)ptr;
33 *(u16 *)ptr = (u16)new;
35 case 4: prev = *(u32 *)ptr;
37 *(u32 *)ptr = (u32)new;
39 case 8: prev = *(u64 *)ptr;
41 *(u64 *)ptr = (u64)new;
44 wrong_size_cmpxchg(ptr);
46 raw_local_irq_restore(flags);
51 * Generic version of __cmpxchg64_local. Takes an u64 parameter.
53 static inline u64 __cmpxchg64_local_generic(volatile void *ptr,
59 raw_local_irq_save(flags);
63 raw_local_irq_restore(flags);