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
);
10 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned
11 * long parameter, supporting various types of architectures.
13 static inline unsigned long __cmpxchg_local_generic(volatile void *ptr
,
14 unsigned long old
, unsigned long new, int size
)
16 unsigned long flags
, prev
;
19 * Sanity checking, compile-time.
21 if (size
== 8 && sizeof(unsigned long) != 8)
22 wrong_size_cmpxchg(ptr
);
24 local_irq_save(flags
);
26 case 1: prev
= *(u8
*)ptr
;
30 case 2: prev
= *(u16
*)ptr
;
32 *(u16
*)ptr
= (u16
)new;
34 case 4: prev
= *(u32
*)ptr
;
36 *(u32
*)ptr
= (u32
)new;
38 case 8: prev
= *(u64
*)ptr
;
40 *(u64
*)ptr
= (u64
)new;
43 wrong_size_cmpxchg(ptr
);
45 local_irq_restore(flags
);
50 * Generic version of __cmpxchg64_local. Takes an u64 parameter.
52 static inline u64
__cmpxchg64_local_generic(volatile void *ptr
,
58 local_irq_save(flags
);
62 local_irq_restore(flags
);
This page took 0.030945 seconds and 5 git commands to generate.