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/*
 * Copyright (2004) Linus Torvalds
 *
 * Author: Zwane Mwaikambo <zwane@fsmlabs.com>
 *
 * Copyright (2004, 2005) Ingo Molnar
 *
 * This file contains the spinlock/rwlock implementations for the
 * SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them)
 *
 * Note that some architectures have special knowledge about the
 * stack frames of these functions in their profile_pc. If you
 * change anything significant here that could change the stack
 * frame contact the architecture maintainers.
 */

#include <linux/linkage.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include <linux/export.h>

/*
 * If lockdep is enabled then we use the non-preemption spin-ops
 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 */
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
/*
 * The __lock_function inlines are taken from
 * include/linux/spinlock_api_smp.h
 */
#else
#define raw_read_can_lock(l)	read_can_lock(l)
#define raw_write_can_lock(l)	write_can_lock(l)
/*
 * We build the __lock_function inlines here. They are too large for
 * inlining all over the place, but here is only one user per function
 * which embedds them into the calling _lock_function below.
 *
 * This could be a long-held lock. We both prepare to spin for a long
 * time (making _this_ CPU preemptable if possible), and we also signal
 * towards that other CPU that it should break the lock ASAP.
 */
#define BUILD_LOCK_OPS(op, locktype)					\
void __lockfunc __raw_##op##_lock(locktype##_t *lock)			\
{									\
	for (;;) {							\
		preempt_disable();					\
		if (likely(do_raw_##op##_trylock(lock)))		\
			break;						\
		preempt_enable();					\
									\
		if (!(lock)->break_lock)				\
			(lock)->break_lock = 1;				\
		while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
			arch_##op##_relax(&lock->raw_lock);		\
	}								\
	(lock)->break_lock = 0;						\
}									\
									\
unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock)	\
{									\
	unsigned long flags;						\
									\
	for (;;) {							\
		preempt_disable();					\
		local_irq_save(flags);					\
		if (likely(do_raw_##op##_trylock(lock)))		\
			break;						\
		local_irq_restore(flags);				\
		preempt_enable();					\
									\
		if (!(lock)->break_lock)				\
			(lock)->break_lock = 1;				\
		while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
			arch_##op##_relax(&lock->raw_lock);		\
	}								\
	(lock)->break_lock = 0;						\
	return flags;							\
}									\
									\
void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock)		\
{									\
	_raw_##op##_lock_irqsave(lock);					\
}									\
									\
void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)		\