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TOMOYO Linux Cross Reference
Linux/arch/alpha/include/asm/local.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ALPHA_LOCAL_H
  3 #define _ALPHA_LOCAL_H
  4 
  5 #include <linux/percpu.h>
  6 #include <linux/atomic.h>
  7 
  8 typedef struct
  9 {
 10         atomic_long_t a;
 11 } local_t;
 12 
 13 #define LOCAL_INIT(i)   { ATOMIC_LONG_INIT(i) }
 14 #define local_read(l)   atomic_long_read(&(l)->a)
 15 #define local_set(l,i)  atomic_long_set(&(l)->a, (i))
 16 #define local_inc(l)    atomic_long_inc(&(l)->a)
 17 #define local_dec(l)    atomic_long_dec(&(l)->a)
 18 #define local_add(i,l)  atomic_long_add((i),(&(l)->a))
 19 #define local_sub(i,l)  atomic_long_sub((i),(&(l)->a))
 20 
 21 static __inline__ long local_add_return(long i, local_t * l)
 22 {
 23         long temp, result;
 24         __asm__ __volatile__(
 25         "1:     ldq_l %0,%1\n"
 26         "       addq %0,%3,%2\n"
 27         "       addq %0,%3,%0\n"
 28         "       stq_c %0,%1\n"
 29         "       beq %0,2f\n"
 30         ".subsection 2\n"
 31         "2:     br 1b\n"
 32         ".previous"
 33         :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
 34         :"Ir" (i), "m" (l->a.counter) : "memory");
 35         return result;
 36 }
 37 
 38 static __inline__ long local_sub_return(long i, local_t * l)
 39 {
 40         long temp, result;
 41         __asm__ __volatile__(
 42         "1:     ldq_l %0,%1\n"
 43         "       subq %0,%3,%2\n"
 44         "       subq %0,%3,%0\n"
 45         "       stq_c %0,%1\n"
 46         "       beq %0,2f\n"
 47         ".subsection 2\n"
 48         "2:     br 1b\n"
 49         ".previous"
 50         :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
 51         :"Ir" (i), "m" (l->a.counter) : "memory");
 52         return result;
 53 }
 54 
 55 #define local_cmpxchg(l, o, n) \
 56         (cmpxchg_local(&((l)->a.counter), (o), (n)))
 57 #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
 58 
 59 /**
 60  * local_add_unless - add unless the number is a given value
 61  * @l: pointer of type local_t
 62  * @a: the amount to add to l...
 63  * @u: ...unless l is equal to u.
 64  *
 65  * Atomically adds @a to @l, so long as it was not @u.
 66  * Returns non-zero if @l was not @u, and zero otherwise.
 67  */
 68 #define local_add_unless(l, a, u)                               \
 69 ({                                                              \
 70         long c, old;                                            \
 71         c = local_read(l);                                      \
 72         for (;;) {                                              \
 73                 if (unlikely(c == (u)))                         \
 74                         break;                                  \
 75                 old = local_cmpxchg((l), c, c + (a));   \
 76                 if (likely(old == c))                           \
 77                         break;                                  \
 78                 c = old;                                        \
 79         }                                                       \
 80         c != (u);                                               \
 81 })
 82 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
 83 
 84 #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
 85 
 86 #define local_dec_return(l) local_sub_return(1,(l))
 87 
 88 #define local_inc_return(l) local_add_return(1,(l))
 89 
 90 #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
 91 
 92 #define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
 93 
 94 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
 95 
 96 /* Verify if faster than atomic ops */
 97 #define __local_inc(l)          ((l)->a.counter++)
 98 #define __local_dec(l)          ((l)->a.counter++)
 99 #define __local_add(i,l)        ((l)->a.counter+=(i))
100 #define __local_sub(i,l)        ((l)->a.counter-=(i))
101 
102 #endif /* _ALPHA_LOCAL_H */
103 

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