/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ALPHA_LOCAL_H #define _ALPHA_LOCAL_H #include <linux/percpu.h> #include <linux/atomic.h> typedef struct { atomic_long_t a; } local_t; #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } #define local_read(l) atomic_long_read(&(l)->a) #define local_set(l,i) atomic_long_set(&(l)->a, (i)) #define local_inc(l) atomic_long_inc(&(l)->a) #define local_dec(l) atomic_long_dec(&(l)->a) #define local_add(i,l) atomic_long_add((i),(&(l)->a)) #define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) static __inline__ long local_add_return(long i, local_t * l) { long temp, result; __asm__ __volatile__( "1: ldq_l %0,%1\n" " addq %0,%3,%2\n" " addq %0,%3,%0\n" " stq_c %0,%1\n" " beq %0,2f\n" ".subsection 2\n" "2: br 1b\n" ".previous" :"=&r" (temp), "=m" (l->a.counter), "=&r" (result) :"Ir" (i), "m" (l->a.counter) : "memory"); return result; } static __inline__ long local_sub_return(long i, local_t * l) { long temp, result; __asm__ __volatile__( "1: ldq_l %0,%1\n" " subq %0,%3,%2\n" " subq %0,%3,%0\n" " stq_c %0,%1\n" " beq %0,2f\n" ".subsection 2\n" "2: br 1b\n" ".previous" :"=&r" (temp), "=m" (l->a.counter), "=&r" (result) :"Ir" (i), "m" (l->a.counter) : "memory"); return result; } #define local_cmpxchg(l, o, n) \ (cmpxchg_local(&((l)->a.counter), (o), (n))) #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n))) /** * local_add_unless - add unless the number is a given value * @l: pointer of type local_t * @a: the amount to add to l... * @u: ...unless l is equal to u. * * Atomically adds @a to @l, so long as it was not @u. * Returns non-zero if @l was not @u, and zero otherwise. */ #define local_add_unless(l, a, u) \ ({ \ long c, old; \ c = local_read(l); \ for (;;) { \ if (unlikely(c == (u))) \ break; \ old = local_cmpxchg((l), c, c + (a)); \ if (likely(old == c)) \ break; \ c = old; \ } \ c != (u); \ }) #define local_inc_not_zero(l) local_add_unless((l), 1, 0) #define local_add_negative(a, l) (local_add_return((a), (l)) < 0) #define local_dec_return(l) local_sub_return(1,(l)) #define local_inc_return(l) local_add_return(1,(l)) #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0) #define local_inc_and_test(l) (local_add_return(1, (l)) == 0) #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) /* Verify if faster than atomic ops */ #define __local_inc(l) ((l)->a.counter++) #define __local_dec(l) ((l)->a.counter++) #define __local_add(i,l) ((l)->a.counter+=(i)) #define __local_sub(i,l) ((l)->a.counter-=(i)) #endif /* _ALPHA_LOCAL_H */
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atomic.h | File | 9.15 KB | 0644 |
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