| 1 |
|
| 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 |
|
| 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 | static inline s64 local64_cmpxchg(local64_t *l, s64 old, s64 new)
|
| 46 | {
|
| 47 | return local_cmpxchg(&l->a, old, new);
|
| 48 | }
|
| 49 |
|
| 50 | static inline bool local64_try_cmpxchg(local64_t *l, s64 *old, s64 new)
|
| 51 | {
|
| 52 | return local_try_cmpxchg(&l->a, (long *)old, new);
|
| 53 | }
|
| 54 |
|
| 55 | #define local64_xchg(l, n) local_xchg((&(l)->a), (n))
|
| 56 | #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u))
|
| 57 | #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a)
|
| 58 |
|
| 59 | |
| 60 | * in interrupt, etc. Some archs can optimize this case well.
|
| 61 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1)
|
| 62 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1)
|
| 63 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i))
|
| 64 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i))
|
| 65 |
|
| 66 | #else
|
| 67 |
|
| 68 | #include <linux/atomic.h>
|
| 69 |
|
| 70 |
|
| 71 | typedef struct {
|
| 72 | atomic64_t a;
|
| 73 | } local64_t;
|
| 74 |
|
| 75 | #define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) }
|
| 76 |
|
| 77 | #define local64_read(l) atomic64_read(&(l)->a)
|
| 78 | #define local64_set(l,i) atomic64_set((&(l)->a),(i))
|
| 79 | #define local64_inc(l) atomic64_inc(&(l)->a)
|
| 80 | #define local64_dec(l) atomic64_dec(&(l)->a)
|
| 81 | #define local64_add(i,l) atomic64_add((i),(&(l)->a))
|
| 82 | #define local64_sub(i,l) atomic64_sub((i),(&(l)->a))
|
| 83 |
|
| 84 | #define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a))
|
| 85 | #define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a)
|
| 86 | #define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a)
|
| 87 | #define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a))
|
| 88 | #define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a))
|
| 89 | #define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a))
|
| 90 | #define local64_inc_return(l) atomic64_inc_return(&(l)->a)
|
| 91 |
|
| 92 | #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n))
|
| 93 | #define local64_try_cmpxchg(l, po, n) atomic64_try_cmpxchg((&(l)->a), (po), (n))
|
| 94 | #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n))
|
| 95 | #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u))
|
| 96 | #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a)
|
| 97 |
|
| 98 | |
| 99 | * in interrupt, etc. Some archs can optimize this case well.
|
| 100 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1)
|
| 101 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1)
|
| 102 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i))
|
| 103 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i))
|
| 104 |
|
| 105 | #endif
|
| 106 |
|
| 107 | #endif
|