cregit-Linux how code gets into the kernel

Release 4.15 kernel/locking/spinlock.c

Directory: kernel/locking
// SPDX-License-Identifier: GPL-2.0
/*
 * 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
 * spinlock : include/linux/spinlock_api_smp.h
 * rwlock   : include/linux/rwlock_api_smp.h
 */
#else

/*
 * 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();                                       \
                                                                        \
                arch_##op##_relax(&lock->raw_lock);                     \
        }                                                               \
}                                                                       \
                                                                        \
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();                                       \
                                                                        \
                arch_##op##_relax(&lock->raw_lock);                     \
        }                                                               \
                                                                        \
        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); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner16100.00%4100.00%
Total16100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo956.25%120.00%
Thomas Gleixner318.75%240.00%
Ingo Molnar318.75%120.00%
Heiko Carstens16.25%120.00%
Total16100.00%5100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner533.33%375.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo741.18%114.29%
Thomas Gleixner529.41%342.86%
Ingo Molnar423.53%228.57%
Heiko Carstens15.88%114.29%
Total17100.00%7100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner320.00%250.00%
Ingo Molnar213.33%125.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner533.33%375.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner320.00%250.00%
Ingo Molnar213.33%125.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1047.62%120.00%
Thomas Gleixner942.86%360.00%
Ingo Molnar29.52%120.00%
Total21100.00%5100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner533.33%375.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1066.67%125.00%
Thomas Gleixner320.00%250.00%
Ingo Molnar213.33%125.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1168.75%133.33%
Thomas Gleixner531.25%266.67%
Total16100.00%3100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo746.67%125.00%
Thomas Gleixner426.67%250.00%
Ingo Molnar426.67%125.00%
Total15100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar1164.71%133.33%
Thomas Gleixner635.29%266.67%
Total17100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar1280.00%133.33%
Thomas Gleixner320.00%266.67%
Total15100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Arjan van de Ven1173.33%125.00%
Thomas Gleixner426.67%375.00%
Total15100.00%4100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Peter Zijlstra1280.00%133.33%
Thomas Gleixner320.00%266.67%
Total15100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar1257.14%133.33%
Thomas Gleixner942.86%266.67%
Total21100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo850.00%125.00%
Thomas Gleixner637.50%250.00%
Ingo Molnar212.50%125.00%
Total16100.00%4100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1280.00%133.33%
Thomas Gleixner320.00%266.67%
Total15100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1058.82%133.33%
Thomas Gleixner741.18%266.67%
Total17100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1173.33%133.33%
Thomas Gleixner213.33%133.33%
Ingo Molnar213.33%133.33%
Total15100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1676.19%133.33%
Ingo Molnar314.29%133.33%
Thomas Gleixner29.52%133.33%
Total21100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Zwane Mwaikambo1386.67%150.00%
Thomas Gleixner213.33%150.00%
Total15100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner3897.44%480.00%
Zwane Mwaikambo12.56%120.00%
Total39100.00%5100.00%

EXPORT_SYMBOL(_raw_spin_lock_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; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner4680.70%457.14%
Zwane Mwaikambo814.04%114.29%
Ingo Molnar23.51%114.29%
Heiko Carstens11.75%114.29%
Total57100.00%7100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner43100.00%4100.00%
Total43100.00%4100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard3597.22%150.00%
Steven Rostedt12.78%150.00%
Total36100.00%2100.00%

EXPORT_SYMBOL(in_lock_functions);

Overall Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner39737.92%627.27%
Zwane Mwaikambo31630.18%14.55%
Ingo Molnar12011.46%29.09%
Heiko Carstens979.26%29.09%
Anton Blanchard403.82%14.55%
Will Deacon383.63%29.09%
Peter Zijlstra161.53%14.55%
Arjan van de Ven151.43%14.55%
Raghavendra K T30.29%14.55%
Andi Kleen10.10%14.55%
Paul Gortmaker10.10%14.55%
Steven Rostedt10.10%14.55%
Cheng Jian10.10%14.55%
Greg Kroah-Hartman10.10%14.55%
Total1047100.00%22100.00%
Directory: kernel/locking
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.