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56 lines
2.2 KiB
56 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_GENERIC_LOCAL_H |
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#define _ASM_GENERIC_LOCAL_H |
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#include <linux/percpu.h> |
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#include <linux/atomic.h> |
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#include <asm/types.h> |
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/* |
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* A signed long type for operations which are atomic for a single CPU. |
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* Usually used in combination with per-cpu variables. |
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* |
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* This is the default implementation, which uses atomic_long_t. Which is |
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* rather pointless. The whole point behind local_t is that some processors |
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* can perform atomic adds and subtracts in a manner which is atomic wrt IRQs |
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* running on this CPU. local_t allows exploitation of such capabilities. |
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*/ |
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/* Implement in terms of atomics. */ |
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/* Don't use typedef: don't want them to be mixed with atomic_t's. */ |
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typedef struct |
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{ |
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atomic_long_t a; |
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} local_t; |
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#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } |
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#define local_read(l) atomic_long_read(&(l)->a) |
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#define local_set(l,i) atomic_long_set((&(l)->a),(i)) |
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#define local_inc(l) atomic_long_inc(&(l)->a) |
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#define local_dec(l) atomic_long_dec(&(l)->a) |
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#define local_add(i,l) atomic_long_add((i),(&(l)->a)) |
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#define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) |
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#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a)) |
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#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a) |
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#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a) |
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#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a)) |
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#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a)) |
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#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a)) |
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#define local_inc_return(l) atomic_long_inc_return(&(l)->a) |
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#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n)) |
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#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n)) |
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#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u)) |
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#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a) |
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/* Non-atomic variants, ie. preemption disabled and won't be touched |
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* in interrupt, etc. Some archs can optimize this case well. */ |
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#define __local_inc(l) local_set((l), local_read(l) + 1) |
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#define __local_dec(l) local_set((l), local_read(l) - 1) |
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#define __local_add(i,l) local_set((l), local_read(l) + (i)) |
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#define __local_sub(i,l) local_set((l), local_read(l) - (i)) |
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#endif /* _ASM_GENERIC_LOCAL_H */
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