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kernel add
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#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
"
" addq %0,%3,%2
"
" addq %0,%3,%0
"
" stq_c %0,%1
"
" beq %0,2f
"
".subsection 2
"
"2: br 1b
"
".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
"
" subq %0,%3,%2
"
" subq %0,%3,%0
"
" stq_c %0,%1
"
" beq %0,2f
"
".subsection 2
"
"2: br 1b
"
".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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