Release 4.10 kernel/locking/spinlock.c

Directory: kernel/locking
/*
 * 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)

/*
 * Some architectures can relax in favour of the CPU owning the lock.
 */
#ifndef arch_read_relax

# define arch_read_relax(l)	cpu_relax()
#endif
#ifndef arch_write_relax

# define arch_write_relax(l)	cpu_relax()
#endif
#ifndef arch_spin_relax

# define arch_spin_relax(l)	cpu_relax()
#endif

/*
 * 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)                \
{                                                                       \
        unsigned long flags;                                            \
                                                                        \
	/*                                                      */	\
	/* Careful: we must exclude softirqs too, hence the     */	\
	/* irq-disabling. We use the generic preemption-aware   */	\
	/* function:                                            */	\
	/**/								\
        flags = _raw_##op##_lock_irqsave(lock);                         \
        local_bh_disable();                                             \
        local_irq_restore(flags);                                       \
}									\

/*
 * Build preemption-friendly versions of the following
 * lock-spinning functions:
 *
 *         __[spin|read|write]_lock()
 *         __[spin|read|write]_lock_irq()
 *         __[spin|read|write]_lock_irqsave()
 *         __[spin|read|write]_lock_bh()
 */
BUILD_LOCK_OPS(spin, raw_spinlock);
BUILD_LOCK_OPS(read, rwlock);
BUILD_LOCK_OPS(write, rwlock);

#endif

#ifndef CONFIG_INLINE_SPIN_TRYLOCK


int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock)
{
	return __raw_spin_trylock(lock);
}
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EXPORT_SYMBOL(_raw_spin_trylock);
#endif

#ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH


int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock)
{
	return __raw_spin_trylock_bh(lock);
}
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EXPORT_SYMBOL(_raw_spin_trylock_bh);
#endif

#ifndef CONFIG_INLINE_SPIN_LOCK


void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)
{
	__raw_spin_lock(lock);
}
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EXPORT_SYMBOL(_raw_spin_lock);
#endif

#ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE


unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
{
	return __raw_spin_lock_irqsave(lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_irqsave);
#endif

#ifndef CONFIG_INLINE_SPIN_LOCK_IRQ


void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
{
	__raw_spin_lock_irq(lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_irq);
#endif

#ifndef CONFIG_INLINE_SPIN_LOCK_BH


void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
{
	__raw_spin_lock_bh(lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_bh);
#endif

#ifdef CONFIG_UNINLINE_SPIN_UNLOCK


void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
{
	__raw_spin_unlock(lock);
}
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EXPORT_SYMBOL(_raw_spin_unlock);
#endif

#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE


void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
{
	__raw_spin_unlock_irqrestore(lock, flags);
}
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EXPORT_SYMBOL(_raw_spin_unlock_irqrestore);
#endif

#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ


void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)
{
	__raw_spin_unlock_irq(lock);
}
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EXPORT_SYMBOL(_raw_spin_unlock_irq);
#endif

#ifndef CONFIG_INLINE_SPIN_UNLOCK_BH


void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)
{
	__raw_spin_unlock_bh(lock);
}
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EXPORT_SYMBOL(_raw_spin_unlock_bh);
#endif

#ifndef CONFIG_INLINE_READ_TRYLOCK


int __lockfunc _raw_read_trylock(rwlock_t *lock)
{
	return __raw_read_trylock(lock);
}
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EXPORT_SYMBOL(_raw_read_trylock);
#endif

#ifndef CONFIG_INLINE_READ_LOCK


void __lockfunc _raw_read_lock(rwlock_t *lock)
{
	__raw_read_lock(lock);
}
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EXPORT_SYMBOL(_raw_read_lock);
#endif

#ifndef CONFIG_INLINE_READ_LOCK_IRQSAVE


unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
{
	return __raw_read_lock_irqsave(lock);
}
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EXPORT_SYMBOL(_raw_read_lock_irqsave);
#endif

#ifndef CONFIG_INLINE_READ_LOCK_IRQ


void __lockfunc _raw_read_lock_irq(rwlock_t *lock)
{
	__raw_read_lock_irq(lock);
}
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EXPORT_SYMBOL(_raw_read_lock_irq);
#endif

#ifndef CONFIG_INLINE_READ_LOCK_BH


void __lockfunc _raw_read_lock_bh(rwlock_t *lock)
{
	__raw_read_lock_bh(lock);
}
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EXPORT_SYMBOL(_raw_read_lock_bh);
#endif

#ifndef CONFIG_INLINE_READ_UNLOCK


void __lockfunc _raw_read_unlock(rwlock_t *lock)
{
	__raw_read_unlock(lock);
}
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EXPORT_SYMBOL(_raw_read_unlock);
#endif

#ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE


void __lockfunc _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
	__raw_read_unlock_irqrestore(lock, flags);
}
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EXPORT_SYMBOL(_raw_read_unlock_irqrestore);
#endif

#ifndef CONFIG_INLINE_READ_UNLOCK_IRQ


void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)
{
	__raw_read_unlock_irq(lock);
}
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EXPORT_SYMBOL(_raw_read_unlock_irq);
#endif

#ifndef CONFIG_INLINE_READ_UNLOCK_BH


void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)
{
	__raw_read_unlock_bh(lock);
}
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EXPORT_SYMBOL(_raw_read_unlock_bh);
#endif

#ifndef CONFIG_INLINE_WRITE_TRYLOCK


int __lockfunc _raw_write_trylock(rwlock_t *lock)
{
	return __raw_write_trylock(lock);
}
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EXPORT_SYMBOL(_raw_write_trylock);
#endif

#ifndef CONFIG_INLINE_WRITE_LOCK


void __lockfunc _raw_write_lock(rwlock_t *lock)
{
	__raw_write_lock(lock);
}
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EXPORT_SYMBOL(_raw_write_lock);
#endif

#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVE


unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
{
	return __raw_write_lock_irqsave(lock);
}
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EXPORT_SYMBOL(_raw_write_lock_irqsave);
#endif

#ifndef CONFIG_INLINE_WRITE_LOCK_IRQ


void __lockfunc _raw_write_lock_irq(rwlock_t *lock)
{
	__raw_write_lock_irq(lock);
}
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EXPORT_SYMBOL(_raw_write_lock_irq);
#endif

#ifndef CONFIG_INLINE_WRITE_LOCK_BH


void __lockfunc _raw_write_lock_bh(rwlock_t *lock)
{
	__raw_write_lock_bh(lock);
}
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EXPORT_SYMBOL(_raw_write_lock_bh);
#endif

#ifndef CONFIG_INLINE_WRITE_UNLOCK


void __lockfunc _raw_write_unlock(rwlock_t *lock)
{
	__raw_write_unlock(lock);
}
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EXPORT_SYMBOL(_raw_write_unlock);
#endif

#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE


void __lockfunc _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
	__raw_write_unlock_irqrestore(lock, flags);
}
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EXPORT_SYMBOL(_raw_write_unlock_irqrestore);
#endif

#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQ


void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)
{
	__raw_write_unlock_irq(lock);
}
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EXPORT_SYMBOL(_raw_write_unlock_irq);
#endif

#ifndef CONFIG_INLINE_WRITE_UNLOCK_BH


void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)
{
	__raw_write_unlock_bh(lock);
}
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EXPORT_SYMBOL(_raw_write_unlock_bh);
#endif

#ifdef CONFIG_DEBUG_LOCK_ALLOC



void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
{
	preempt_disable();
	spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_nested);



void __lockfunc _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass)
{
	__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
	spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_bh_nested);



unsigned long __lockfunc _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock,
						   int subclass)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
	LOCK_CONTENDED_FLAGS(lock, do_raw_spin_trylock, do_raw_spin_lock,
				do_raw_spin_lock_flags, &flags);
	return flags;
}
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EXPORT_SYMBOL(_raw_spin_lock_irqsave_nested);



void __lockfunc _raw_spin_lock_nest_lock(raw_spinlock_t *lock,
				     struct lockdep_map *nest_lock)
{
	preempt_disable();
	spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
}
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EXPORT_SYMBOL(_raw_spin_lock_nest_lock);

#endif



notrace int in_lock_functions(unsigned long addr)
{
	/* Linker adds these: start and end of __lockfunc functions */
	extern char __lock_text_start[], __lock_text_end[];

	return addr >= (unsigned long)__lock_text_start
	&& addr < (unsigned long)__lock_text_end;
}
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EXPORT_SYMBOL(in_lock_functions);
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Directory: kernel/locking

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cregit-Linux how code gets into the kernel

Release 4.10 kernel/locking/spinlock.c

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