tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_CMPXCHG_H
3#define _ALPHA_CMPXCHG_H
4
5/*
6 * Atomic exchange routines.
7 */
8
9#define __ASM__MB
10#define ____xchg(type, args...) __xchg ## type ## _local(args)
11#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
12#include <asm/xchg.h>
13
14#define xchg_local(ptr, x) \
15({ \
16 __typeof__(*(ptr)) _x_ = (x); \
17 (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \
18 sizeof(*(ptr))); \
19})
20
21#define cmpxchg_local(ptr, o, n) \
22({ \
23 __typeof__(*(ptr)) _o_ = (o); \
24 __typeof__(*(ptr)) _n_ = (n); \
25 (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
26 (unsigned long)_n_, \
27 sizeof(*(ptr))); \
28})
29
30#define cmpxchg64_local(ptr, o, n) \
31({ \
32 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
33 cmpxchg_local((ptr), (o), (n)); \
34})
35
36#ifdef CONFIG_SMP
37#undef __ASM__MB
38#define __ASM__MB "\tmb\n"
39#endif
40#undef ____xchg
41#undef ____cmpxchg
42#define ____xchg(type, args...) __xchg ##type(args)
43#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
44#include <asm/xchg.h>
45
46#define xchg(ptr, x) \
47({ \
48 __typeof__(*(ptr)) _x_ = (x); \
49 (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, \
50 sizeof(*(ptr))); \
51})
52
53#define cmpxchg(ptr, o, n) \
54({ \
55 __typeof__(*(ptr)) _o_ = (o); \
56 __typeof__(*(ptr)) _n_ = (n); \
57 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
58 (unsigned long)_n_, sizeof(*(ptr)));\
59})
60
61#define cmpxchg64(ptr, o, n) \
62({ \
63 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
64 cmpxchg((ptr), (o), (n)); \
65})
66
67#undef __ASM__MB
68#undef ____cmpxchg
69
70#endif /* _ALPHA_CMPXCHG_H */