/* *  arch/s390/lib/spinlock.c *    Out of line spinlock code. * *    Copyright (C) IBM Corp. 2004, 2006 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) */#include <linux/types.h>#include <linux/module.h>#include <linux/spinlock.h>#include <linux/init.h>#include <asm/io.h>int spin_retry = 1000;/** * spin_retry= parameter */static int __init spin_retry_setup(char *str){	spin_retry = simple_strtoul(str, &str, 0);	return 1;}__setup("spin_retry=", spin_retry_setup);static inline void_diag44(void){#ifdef CONFIG_64BIT	if (MACHINE_HAS_DIAG44)#endif		asm volatile("diag 0,0,0x44");}void_raw_spin_lock_wait(raw_spinlock_t *lp, unsigned int pc){	int count = spin_retry;	while (1) {		if (count-- <= 0) {			_diag44();			count = spin_retry;		}		if (__raw_spin_is_locked(lp))			continue;		if (_raw_compare_and_swap(&lp->lock, 0, pc) == 0)			return;	}}EXPORT_SYMBOL(_raw_spin_lock_wait);int_raw_spin_trylock_retry(raw_spinlock_t *lp, unsigned int pc){	int count = spin_retry;	while (count-- > 0) {		if (__raw_spin_is_locked(lp))			continue;		if (_raw_compare_and_swap(&lp->lock, 0, pc) == 0)			return 1;	}	return 0;}EXPORT_SYMBOL(_raw_spin_trylock_retry);void_raw_read_lock_wait(raw_rwlock_t *rw){	unsigned int old;	int count = spin_retry;	while (1) {		if (count-- <= 0) {			_diag44();			count = spin_retry;		}		if (!__raw_read_can_lock(rw))			continue;		old = rw->lock & 0x7fffffffU;		if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)			return;	}}EXPORT_SYMBOL(_raw_read_lock_wait);int_raw_read_trylock_retry(raw_rwlock_t *rw){	unsigned int old;	int count = spin_retry;	while (count-- > 0) {		if (!__raw_read_can_lock(rw))			continue;		old = rw->lock & 0x7fffffffU;		if (_raw_compare_and_swap(&rw->lock, old, old + 1) == old)			return 1;	}	return 0;}EXPORT_SYMBOL(_raw_read_trylock_retry);void_raw_write_lock_wait(raw_rwlock_t *rw){	int count = spin_retry;	while (1) {		if (count-- <= 0) {			_diag44();			count = spin_retry;		}		if (!__raw_write_can_lock(rw))			continue;		if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)			return;	}}EXPORT_SYMBOL(_raw_write_lock_wait);int_raw_write_trylock_retry(raw_rwlock_t *rw){	int count = spin_retry;	while (count-- > 0) {		if (!__raw_write_can_lock(rw))			continue;		if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000) == 0)			return 1;	}	return 0;}EXPORT_SYMBOL(_raw_write_trylock_retry);