| 1 |
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| 2 | #ifndef _ALPHA_LOCAL_H
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| 3 | #define _ALPHA_LOCAL_H
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| 4 |
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| 5 | #include <linux/percpu.h>
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| 6 | #include <linux/atomic.h>
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| 7 |
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| 8 | typedef struct
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| 9 | {
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| 10 | atomic_long_t a;
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| 11 | } local_t;
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| 12 |
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| 13 | #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
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| 14 | #define local_read(l) atomic_long_read(&(l)->a)
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| 15 | #define local_set(l,i) atomic_long_set(&(l)->a, (i))
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| 16 | #define local_inc(l) atomic_long_inc(&(l)->a)
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| 17 | #define local_dec(l) atomic_long_dec(&(l)->a)
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| 18 | #define local_add(i,l) atomic_long_add((i),(&(l)->a))
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| 19 | #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
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| 20 |
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| 21 | static __inline__ long local_add_return(long i, local_t * l)
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| 22 | {
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| 23 | long temp, result;
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| 24 | __asm__ __volatile__(
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| 25 | "1: ldq_l %0,%1\n"
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| 26 | " addq %0,%3,%2\n"
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| 27 | " addq %0,%3,%0\n"
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| 28 | " stq_c %0,%1\n"
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| 29 | " beq %0,2f\n"
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| 30 | ".subsection 2\n"
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| 31 | "2: br 1b\n"
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| 32 | ".previous"
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| 33 | :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
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| 34 | :"Ir" (i), "m" (l->a.counter) : "memory");
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| 35 | return result;
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| 36 | }
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| 37 |
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| 38 | static __inline__ long local_sub_return(long i, local_t * l)
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| 39 | {
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| 40 | long temp, result;
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| 41 | __asm__ __volatile__(
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| 42 | "1: ldq_l %0,%1\n"
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| 43 | " subq %0,%3,%2\n"
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| 44 | " subq %0,%3,%0\n"
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| 45 | " stq_c %0,%1\n"
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| 46 | " beq %0,2f\n"
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| 47 | ".subsection 2\n"
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| 48 | "2: br 1b\n"
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| 49 | ".previous"
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| 50 | :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
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| 51 | :"Ir" (i), "m" (l->a.counter) : "memory");
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| 52 | return result;
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| 53 | }
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| 54 |
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| 55 | static __inline__ long local_cmpxchg(local_t *l, long old, long new)
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| 56 | {
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| 57 | return cmpxchg_local(&l->a.counter, old, new);
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| 58 | }
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| 59 |
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| 60 | static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
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| 61 | {
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| 62 | return try_cmpxchg_local(&l->a.counter, (s64 *)old, new);
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| 63 | }
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| 64 |
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| 65 | #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
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| 66 |
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| 67 | |
| 68 | * local_add_unless - add unless the number is already a given value
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| 69 | * @l: pointer of type local_t
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| 70 | * @a: the amount to add to l...
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| 71 | * @u: ...unless l is equal to u.
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| 72 | *
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| 73 | * Atomically adds @a to @l, if @v was not already @u.
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| 74 | * Returns true if the addition was done.
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| 75 |
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| 76 | static __inline__ bool
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| 77 | local_add_unless(local_t *l, long a, long u)
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| 78 | {
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| 79 | long c = local_read(l);
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| 80 |
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| 81 | do {
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| 82 | if (unlikely(c == u))
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| 83 | return false;
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| 84 | } while (!local_try_cmpxchg(l, &c, c + a));
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| 85 |
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| 86 | return true;
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| 87 | }
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| 88 |
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| 89 | #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
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| 90 |
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| 91 | #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
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| 92 |
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| 93 | #define local_dec_return(l) local_sub_return(1,(l))
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| 94 |
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| 95 | #define local_inc_return(l) local_add_return(1,(l))
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| 96 |
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| 97 | #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
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| 98 |
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| 99 | #define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
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| 100 |
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| 101 | #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
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| 102 |
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| 103 |
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| 104 | #define __local_inc(l) ((l)->a.counter++)
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| 105 | #define __local_dec(l) ((l)->a.counter++)
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| 106 | #define __local_add(i,l) ((l)->a.counter+=(i))
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| 107 | #define __local_sub(i,l) ((l)->a.counter-=(i))
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| 108 |
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| 109 | #endif
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