5e0eb67974
Rewrite local_add_unless() as a static inline function with boolean return value, similar to the arch_atomic_add_unless() arch fallbacks. The function is currently unused. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20230731084458.28096-1-ubizjak@gmail.com
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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 <linux/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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static __inline__ long local_cmpxchg(local_t *l, long old, long new)
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{
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return cmpxchg_local(&l->a.counter, old, new);
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}
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static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
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{
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return try_cmpxchg_local(&l->a.counter, (s64 *)old, new);
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}
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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 already 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, if @v was not already @u.
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* Returns true if the addition was done.
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*/
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static __inline__ bool
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local_add_unless(local_t *l, long a, long u)
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{
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long c = local_read(l);
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do {
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if (unlikely(c == u))
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return false;
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} while (!local_try_cmpxchg(l, &c, c + a));
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return true;
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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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#endif /* _ALPHA_LOCAL_H */
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