powerpc: use generic atomic implementation for local_t

#ifndef _ARCH_POWERPC_LOCAL_H

#define _ARCH_POWERPC_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_add(i,l)	atomic_long_add((i),(&(l)->a))

#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))

#define local_inc(l)	atomic_long_inc(&(l)->a)

#define local_dec(l)	atomic_long_dec(&(l)->a)

static __inline__ long local_add_return(long a, local_t *l)

{

	long t;

	__asm__ __volatile__(

"1:"	PPC_LLARX(%0,0,%2,0) "			# local_add_return\n\

	add	%0,%1,%0\n"

	PPC405_ERR77(0,%2)

	PPC_STLCX	"%0,0,%2 \n\

	bne-	1b"

	: "=&r" (t)

	: "r" (a), "r" (&(l->a.counter))

	: "cc", "memory");

	return t;

}

#define local_add_negative(a, l)	(local_add_return((a), (l)) < 0)

static __inline__ long local_sub_return(long a, local_t *l)

{

	long t;

	__asm__ __volatile__(

"1:"	PPC_LLARX(%0,0,%2,0) "			# local_sub_return\n\

	subf	%0,%1,%0\n"

	PPC405_ERR77(0,%2)

	PPC_STLCX	"%0,0,%2 \n\

	bne-	1b"

	: "=&r" (t)

	: "r" (a), "r" (&(l->a.counter))

	: "cc", "memory");

	return t;

}

static __inline__ long local_inc_return(local_t *l)

{

	long t;

	__asm__ __volatile__(

"1:"	PPC_LLARX(%0,0,%1,0) "			# local_inc_return\n\

	addic	%0,%0,1\n"

	PPC405_ERR77(0,%1)

	PPC_STLCX	"%0,0,%1 \n\

	bne-	1b"

	: "=&r" (t)

	: "r" (&(l->a.counter))

	: "cc", "xer", "memory");

	return t;

}

/*

 * local_inc_and_test - increment and test

 * @l: pointer of type local_t

 *

 * Atomically increments @l by 1

 * and returns true if the result is zero, or false for all

 * other cases.

 */

#define local_inc_and_test(l) (local_inc_return(l) == 0)

static __inline__ long local_dec_return(local_t *l)

{

	long t;

	__asm__ __volatile__(

"1:"	PPC_LLARX(%0,0,%1,0) "			# local_dec_return\n\

	addic	%0,%0,-1\n"

	PPC405_ERR77(0,%1)

	PPC_STLCX	"%0,0,%1\n\

	bne-	1b"

	: "=&r" (t)

	: "r" (&(l->a.counter))

	: "cc", "xer", "memory");

	return t;

}

#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 v...

 * @u: ...unless v 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.

 */

static __inline__ int local_add_unless(local_t *l, long a, long u)

{

	long t;

	__asm__ __volatile__ (

"1:"	PPC_LLARX(%0,0,%1,0) "			# local_add_unless\n\

	cmpw	0,%0,%3 \n\

	beq-	2f \n\

	add	%0,%2,%0 \n"

	PPC405_ERR77(0,%2)

	PPC_STLCX	"%0,0,%1 \n\

	bne-	1b \n"

"	subf	%0,%2,%0 \n\

2:"

	: "=&r" (t)

	: "r" (&(l->a.counter)), "r" (a), "r" (u)

	: "cc", "memory");

	return t != u;

}

#define local_inc_not_zero(l) local_add_unless((l), 1, 0)

#define local_sub_and_test(a, l)	(local_sub_return((a), (l)) == 0)

#define local_dec_and_test(l)		(local_dec_return((l)) == 0)

/*

 * Atomically test *l and decrement if it is greater than 0.

 * The function returns the old value of *l minus 1.

 */

static __inline__ long local_dec_if_positive(local_t *l)

{

	long t;

	__asm__ __volatile__(

"1:"	PPC_LLARX(%0,0,%1,0) "			# local_dec_if_positive\n\

	cmpwi	%0,1\n\

	addi	%0,%0,-1\n\

	blt-	2f\n"

	PPC405_ERR77(0,%1)

	PPC_STLCX	"%0,0,%1\n\

	bne-	1b"

	"\n\

2:"	: "=&b" (t)

	: "r" (&(l->a.counter))

	: "cc", "memory");

	return t;

}

/* Use these for per-cpu local_t variables: on some archs they are

 * much more efficient than these naive implementations.  Note they take

 * a variable, not an address.

 */

#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))

#include <asm-generic/local.h>

#endif /* _ARCH_POWERPC_LOCAL_H */