projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1996bda2 PZ |
2 | #ifndef _ASM_GENERIC_LOCAL64_H |
| 3 | #define _ASM_GENERIC_LOCAL64_H | |
| 4 | ||
| 5 | #include <linux/percpu.h> | |
| 6 | #include <asm/types.h> | |
| 7 | ||
| 8 | /* | |
| 9 | * A signed long type for operations which are atomic for a single CPU. | |
| 10 | * Usually used in combination with per-cpu variables. | |
| 11 | * | |
| 12 | * This is the default implementation, which uses atomic64_t. Which is | |
| 13 | * rather pointless. The whole point behind local64_t is that some processors | |
| 14 | * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs | |
| 15 | * running on this CPU. local64_t allows exploitation of such capabilities. | |
| 16 | */ | |
| 17 | ||
| 18 | /* Implement in terms of atomics. */ | |
| 19 | ||
| 20 | #if BITS_PER_LONG == 64 | |
| 21 | ||
| 22 | #include <asm/local.h> | |
| 23 | ||
| 24 | typedef struct { | |
| 25 | local_t a; | |
| 26 | } local64_t; | |
| 27 | ||
| 28 | #define LOCAL64_INIT(i) { LOCAL_INIT(i) } | |
| 29 | ||
| 30 | #define local64_read(l) local_read(&(l)->a) | |
| 31 | #define local64_set(l,i) local_set((&(l)->a),(i)) | |
| 32 | #define local64_inc(l) local_inc(&(l)->a) | |
| 33 | #define local64_dec(l) local_dec(&(l)->a) | |
| 34 | #define local64_add(i,l) local_add((i),(&(l)->a)) | |
| 35 | #define local64_sub(i,l) local_sub((i),(&(l)->a)) | |
| 36 | ||
| 37 | #define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) | |
| 38 | #define local64_dec_and_test(l) local_dec_and_test(&(l)->a) | |
| 39 | #define local64_inc_and_test(l) local_inc_and_test(&(l)->a) | |
| 40 | #define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) | |
| 41 | #define local64_add_return(i, l) local_add_return((i), (&(l)->a)) | |
| 42 | #define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) | |
| 43 | #define local64_inc_return(l) local_inc_return(&(l)->a) | |
| 44 | ||
| 45 | #define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) | |
| 46 | #define local64_xchg(l, n) local_xchg((&(l)->a), (n)) | |
| 47 | #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) | |
| 48 | #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) | |
| 49 | ||
| 50 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
| 51 | * in interrupt, etc. Some archs can optimize this case well. */ | |
| 52 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
| 53 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
| 54 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
| 55 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
| 56 | ||
| 57 | #else /* BITS_PER_LONG != 64 */ | |
| 58 | ||
| 60063497 | 59 | #include <linux/atomic.h> |
| 1996bda2 PZ |
60 | |
| 61 | /* Don't use typedef: don't want them to be mixed with atomic_t's. */ | |
| 62 | typedef struct { | |
| 63 | atomic64_t a; | |
| 64 | } local64_t; | |
| 65 | ||
| 66 | #define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } | |
| 67 | ||
| 68 | #define local64_read(l) atomic64_read(&(l)->a) | |
| 69 | #define local64_set(l,i) atomic64_set((&(l)->a),(i)) | |
| 70 | #define local64_inc(l) atomic64_inc(&(l)->a) | |
| 71 | #define local64_dec(l) atomic64_dec(&(l)->a) | |
| 72 | #define local64_add(i,l) atomic64_add((i),(&(l)->a)) | |
| 73 | #define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) | |
| 74 | ||
| 75 | #define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) | |
| 76 | #define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) | |
| 77 | #define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) | |
| 78 | #define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) | |
| 79 | #define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) | |
| 80 | #define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) | |
| 81 | #define local64_inc_return(l) atomic64_inc_return(&(l)->a) | |
| 82 | ||
| 83 | #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) | |
| 84 | #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) | |
| 85 | #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) | |
| 86 | #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) | |
| 87 | ||
| 88 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
| 89 | * in interrupt, etc. Some archs can optimize this case well. */ | |
| 90 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
| 91 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
| 92 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
| 93 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
| 94 | ||
| 95 | #endif /* BITS_PER_LONG != 64 */ | |
| 96 | ||
| 97 | #endif /* _ASM_GENERIC_LOCAL64_H */ |