1 #ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H
2 #define __ASM_GENERIC_CMPXCHG_LOCAL_H
4 #include <linux/types.h>
6 extern unsigned long wrong_size_cmpxchg(volatile void *ptr);
9 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned
10 * long parameter, supporting various types of architectures.
12 static inline unsigned long __cmpxchg_local_generic(volatile void *ptr,
13 unsigned long old, unsigned long new, int size)
15 unsigned long flags, prev;
18 * Sanity checking, compile-time.
20 if (size == 8 && sizeof(unsigned long) != 8)
21 wrong_size_cmpxchg(ptr);
23 local_irq_save(flags);
25 case 1: prev = *(u8 *)ptr;
29 case 2: prev = *(u16 *)ptr;
31 *(u16 *)ptr = (u16)new;
33 case 4: prev = *(u32 *)ptr;
35 *(u32 *)ptr = (u32)new;
37 case 8: prev = *(u64 *)ptr;
39 *(u64 *)ptr = (u64)new;
42 wrong_size_cmpxchg(ptr);
44 local_irq_restore(flags);
49 * Generic version of __cmpxchg64_local. Takes an u64 parameter.
51 static inline u64 __cmpxchg64_local_generic(volatile void *ptr,
57 local_irq_save(flags);
61 local_irq_restore(flags);