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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/asm-generic/cmpxchg-local.h
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
);