f43f7b46eb
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
#ifndef _ALPHA_LOCAL_H
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#define _ALPHA_LOCAL_H
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#include <linux/percpu.h>
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#include <asm/atomic.h>
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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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static __inline__ long local_add_return(long i, local_t * l)
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{
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long temp, result;
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__asm__ __volatile__(
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"1: ldq_l %0,%1\n"
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" addq %0,%3,%2\n"
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" addq %0,%3,%0\n"
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" stq_c %0,%1\n"
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" beq %0,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
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:"Ir" (i), "m" (l->a.counter) : "memory");
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return result;
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}
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static __inline__ long local_sub_return(long i, local_t * l)
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{
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long temp, result;
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__asm__ __volatile__(
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"1: ldq_l %0,%1\n"
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" subq %0,%3,%2\n"
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" subq %0,%3,%0\n"
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" stq_c %0,%1\n"
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" beq %0,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
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:"Ir" (i), "m" (l->a.counter) : "memory");
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return result;
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}
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#define local_cmpxchg(l, o, n) \
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(cmpxchg_local(&((l)->a.counter), (o), (n)))
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#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
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/**
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* local_add_unless - add unless the number is a given value
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* @l: pointer of type local_t
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* @a: the amount to add to l...
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* @u: ...unless l is equal to u.
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*
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* Atomically adds @a to @l, so long as it was not @u.
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* Returns non-zero if @l was not @u, and zero otherwise.
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*/
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#define local_add_unless(l, a, u) \
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({ \
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long c, old; \
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c = local_read(l); \
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for (;;) { \
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if (unlikely(c == (u))) \
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break; \
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old = local_cmpxchg((l), c, c + (a)); \
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if (likely(old == c)) \
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break; \
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c = old; \
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} \
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c != (u); \
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})
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#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
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#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
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#define local_dec_return(l) local_sub_return(1,(l))
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#define local_inc_return(l) local_add_return(1,(l))
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#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
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#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
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#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
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/* Verify if faster than atomic ops */
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#define __local_inc(l) ((l)->a.counter++)
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#define __local_dec(l) ((l)->a.counter++)
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#define __local_add(i,l) ((l)->a.counter+=(i))
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#define __local_sub(i,l) ((l)->a.counter-=(i))
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/* Use these for per-cpu local_t variables: on some archs they are
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* much more efficient than these naive implementations. Note they take
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* a variable, not an address.
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*/
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#define cpu_local_read(l) local_read(&__get_cpu_var(l))
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#define cpu_local_set(l, i) local_set(&__get_cpu_var(l), (i))
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#define cpu_local_inc(l) local_inc(&__get_cpu_var(l))
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#define cpu_local_dec(l) local_dec(&__get_cpu_var(l))
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#define cpu_local_add(i, l) local_add((i), &__get_cpu_var(l))
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#define cpu_local_sub(i, l) local_sub((i), &__get_cpu_var(l))
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#define __cpu_local_inc(l) __local_inc(&__get_cpu_var(l))
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#define __cpu_local_dec(l) __local_dec(&__get_cpu_var(l))
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#define __cpu_local_add(i, l) __local_add((i), &__get_cpu_var(l))
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#define __cpu_local_sub(i, l) __local_sub((i), &__get_cpu_var(l))
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#endif /* _ALPHA_LOCAL_H */
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