| #ifndef _ASM_GENERIC_LOCAL64_H |
| #define _ASM_GENERIC_LOCAL64_H |
| |
| #include <linux/percpu.h> |
| #include <asm/types.h> |
| |
| /* |
| * A signed long type for operations which are atomic for a single CPU. |
| * Usually used in combination with per-cpu variables. |
| * |
| * This is the default implementation, which uses atomic64_t. Which is |
| * rather pointless. The whole point behind local64_t is that some processors |
| * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs |
| * running on this CPU. local64_t allows exploitation of such capabilities. |
| */ |
| |
| /* Implement in terms of atomics. */ |
| |
| #if BITS_PER_LONG == 64 |
| |
| #include <asm/local.h> |
| |
| typedef struct { |
| local_t a; |
| } local64_t; |
| |
| #define LOCAL64_INIT(i) { LOCAL_INIT(i) } |
| |
| #define local64_read(l) local_read(&(l)->a) |
| #define local64_set(l,i) local_set((&(l)->a),(i)) |
| #define local64_inc(l) local_inc(&(l)->a) |
| #define local64_dec(l) local_dec(&(l)->a) |
| #define local64_add(i,l) local_add((i),(&(l)->a)) |
| #define local64_sub(i,l) local_sub((i),(&(l)->a)) |
| |
| #define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) |
| #define local64_dec_and_test(l) local_dec_and_test(&(l)->a) |
| #define local64_inc_and_test(l) local_inc_and_test(&(l)->a) |
| #define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) |
| #define local64_add_return(i, l) local_add_return((i), (&(l)->a)) |
| #define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) |
| #define local64_inc_return(l) local_inc_return(&(l)->a) |
| |
| #define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) |
| #define local64_xchg(l, n) local_xchg((&(l)->a), (n)) |
| #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) |
| #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) |
| |
| /* Non-atomic variants, ie. preemption disabled and won't be touched |
| * in interrupt, etc. Some archs can optimize this case well. */ |
| #define __local64_inc(l) local64_set((l), local64_read(l) + 1) |
| #define __local64_dec(l) local64_set((l), local64_read(l) - 1) |
| #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) |
| #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) |
| |
| #else /* BITS_PER_LONG != 64 */ |
| |
| #include <linux/atomic.h> |
| |
| /* Don't use typedef: don't want them to be mixed with atomic_t's. */ |
| typedef struct { |
| atomic64_t a; |
| } local64_t; |
| |
| #define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } |
| |
| #define local64_read(l) atomic64_read(&(l)->a) |
| #define local64_set(l,i) atomic64_set((&(l)->a),(i)) |
| #define local64_inc(l) atomic64_inc(&(l)->a) |
| #define local64_dec(l) atomic64_dec(&(l)->a) |
| #define local64_add(i,l) atomic64_add((i),(&(l)->a)) |
| #define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) |
| |
| #define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) |
| #define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) |
| #define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) |
| #define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) |
| #define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) |
| #define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) |
| #define local64_inc_return(l) atomic64_inc_return(&(l)->a) |
| |
| #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) |
| #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) |
| #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) |
| #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) |
| |
| /* Non-atomic variants, ie. preemption disabled and won't be touched |
| * in interrupt, etc. Some archs can optimize this case well. */ |
| #define __local64_inc(l) local64_set((l), local64_read(l) + 1) |
| #define __local64_dec(l) local64_set((l), local64_read(l) - 1) |
| #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) |
| #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) |
| |
| #endif /* BITS_PER_LONG != 64 */ |
| |
| #endif /* _ASM_GENERIC_LOCAL64_H */ |