1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef _ASM_GENERIC_LOCAL_H
3 #define _ASM_GENERIC_LOCAL_H
4
5 #include <linux/percpu.h>
6 #include <linux/atomic.h>
7 #include <asm/types.h>
8
9 /*
10 * A signed long type for operations which are
11 * Usually used in combination with per-cpu va
12 *
13 * This is the default implementation, which u
14 * rather pointless. The whole point behind l
15 * can perform atomic adds and subtracts in a
16 * running on this CPU. local_t allows exploi
17 */
18
19 /* Implement in terms of atomics. */
20
21 /* Don't use typedef: don't want them to be mi
22 typedef struct
23 {
24 atomic_long_t a;
25 } local_t;
26
27 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i)
28
29 #define local_read(l) atomic_long_read(&(l)-
30 #define local_set(l,i) atomic_long_set((&(l)-
31 #define local_inc(l) atomic_long_inc(&(l)->
32 #define local_dec(l) atomic_long_dec(&(l)->
33 #define local_add(i,l) atomic_long_add((i),(&
34 #define local_sub(i,l) atomic_long_sub((i),(&
35
36 #define local_sub_and_test(i, l) atomic_long_s
37 #define local_dec_and_test(l) atomic_long_dec_
38 #define local_inc_and_test(l) atomic_long_inc_
39 #define local_add_negative(i, l) atomic_long_a
40 #define local_add_return(i, l) atomic_long_add
41 #define local_sub_return(i, l) atomic_long_sub
42 #define local_inc_return(l) atomic_long_inc_re
43
44 #define local_cmpxchg(l, o, n) atomic_long_cmp
45 #define local_try_cmpxchg(l, po, n) atomic_lon
46 #define local_xchg(l, n) atomic_long_xchg((&(l
47 #define local_add_unless(l, _a, u) atomic_long
48 #define local_inc_not_zero(l) atomic_long_inc_
49
50 /* Non-atomic variants, ie. preemption disable
51 * in interrupt, etc. Some archs can optimize
52 #define __local_inc(l) local_set((l),
53 #define __local_dec(l) local_set((l),
54 #define __local_add(i,l) local_set((l),
55 #define __local_sub(i,l) local_set((l),
56
57 #endif /* _ASM_GENERIC_LOCAL_H */
58
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