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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428// 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>
#ifdef CONFIG_MMIOWB#ifndef arch_mmiowb_stateDEFINE_PER_CPU(struct mmiowb_state, __mmiowb_state);EXPORT_PER_CPU_SYMBOL(__mmiowb_state);#endif#endif
/* * 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 embeds 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 preemptible if possible), and we also signal * towards that other CPU that it should break the lock ASAP. */#define BUILD_LOCK_OPS(op, locktype, lock_ctx_op) \static void __lockfunc __raw_##op##_lock(locktype##_t *lock) \ lock_ctx_op(lock) \{ \ for (;;) { \ preempt_disable(); \ if (likely(do_raw_##op##_trylock(lock))) \ break; \ preempt_enable(); \ \ arch_##op##_relax(&lock->raw_lock); \ } \} \ \static unsigned long __lockfunc __raw_##op##_lock_irqsave(locktype##_t *lock) \ lock_ctx_op(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; \} \ \static void __lockfunc __raw_##op##_lock_irq(locktype##_t *lock) \ lock_ctx_op(lock) \{ \ _raw_##op##_lock_irqsave(lock); \} \ \static void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock) \ lock_ctx_op(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, __acquires);
#ifndef CONFIG_PREEMPT_RTBUILD_LOCK_OPS(read, rwlock, __acquires_shared);BUILD_LOCK_OPS(write, rwlock, __acquires);#endif
#endif
#ifndef CONFIG_INLINE_SPIN_TRYLOCKnoinline int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock){ return __raw_spin_trylock(lock);}EXPORT_SYMBOL(_raw_spin_trylock);#endif
#ifndef CONFIG_INLINE_SPIN_TRYLOCK_BHnoinline int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock){ return __raw_spin_trylock_bh(lock);}EXPORT_SYMBOL(_raw_spin_trylock_bh);#endif
#ifndef CONFIG_INLINE_SPIN_LOCKnoinline void __lockfunc _raw_spin_lock(raw_spinlock_t *lock){ __raw_spin_lock(lock);}EXPORT_SYMBOL(_raw_spin_lock);#endif
#ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVEnoinline unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock){ return __raw_spin_lock_irqsave(lock);}EXPORT_SYMBOL(_raw_spin_lock_irqsave);#endif
#ifndef CONFIG_INLINE_SPIN_LOCK_IRQnoinline void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock){ __raw_spin_lock_irq(lock);}EXPORT_SYMBOL(_raw_spin_lock_irq);#endif
#ifndef CONFIG_INLINE_SPIN_LOCK_BHnoinline void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock){ __raw_spin_lock_bh(lock);}EXPORT_SYMBOL(_raw_spin_lock_bh);#endif
#ifdef CONFIG_UNINLINE_SPIN_UNLOCKnoinline void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock){ __raw_spin_unlock(lock);}EXPORT_SYMBOL(_raw_spin_unlock);#endif
#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTOREnoinline void __lockfunc _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags){ __raw_spin_unlock_irqrestore(lock, flags);}EXPORT_SYMBOL(_raw_spin_unlock_irqrestore);#endif
#ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQnoinline void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock){ __raw_spin_unlock_irq(lock);}EXPORT_SYMBOL(_raw_spin_unlock_irq);#endif
#ifndef CONFIG_INLINE_SPIN_UNLOCK_BHnoinline void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock){ __raw_spin_unlock_bh(lock);}EXPORT_SYMBOL(_raw_spin_unlock_bh);#endif
#ifndef CONFIG_PREEMPT_RT
#ifndef CONFIG_INLINE_READ_TRYLOCKnoinline int __lockfunc _raw_read_trylock(rwlock_t *lock){ return __raw_read_trylock(lock);}EXPORT_SYMBOL(_raw_read_trylock);#endif
#ifndef CONFIG_INLINE_READ_LOCKnoinline void __lockfunc _raw_read_lock(rwlock_t *lock){ __raw_read_lock(lock);}EXPORT_SYMBOL(_raw_read_lock);#endif
#ifndef CONFIG_INLINE_READ_LOCK_IRQSAVEnoinline unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock){ return __raw_read_lock_irqsave(lock);}EXPORT_SYMBOL(_raw_read_lock_irqsave);#endif
#ifndef CONFIG_INLINE_READ_LOCK_IRQnoinline void __lockfunc _raw_read_lock_irq(rwlock_t *lock){ __raw_read_lock_irq(lock);}EXPORT_SYMBOL(_raw_read_lock_irq);#endif
#ifndef CONFIG_INLINE_READ_LOCK_BHnoinline void __lockfunc _raw_read_lock_bh(rwlock_t *lock){ __raw_read_lock_bh(lock);}EXPORT_SYMBOL(_raw_read_lock_bh);#endif
#ifndef CONFIG_INLINE_READ_UNLOCKnoinline void __lockfunc _raw_read_unlock(rwlock_t *lock){ __raw_read_unlock(lock);}EXPORT_SYMBOL(_raw_read_unlock);#endif
#ifndef CONFIG_INLINE_READ_UNLOCK_IRQRESTOREnoinline void __lockfunc _raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags){ __raw_read_unlock_irqrestore(lock, flags);}EXPORT_SYMBOL(_raw_read_unlock_irqrestore);#endif
#ifndef CONFIG_INLINE_READ_UNLOCK_IRQnoinline void __lockfunc _raw_read_unlock_irq(rwlock_t *lock){ __raw_read_unlock_irq(lock);}EXPORT_SYMBOL(_raw_read_unlock_irq);#endif
#ifndef CONFIG_INLINE_READ_UNLOCK_BHnoinline void __lockfunc _raw_read_unlock_bh(rwlock_t *lock){ __raw_read_unlock_bh(lock);}EXPORT_SYMBOL(_raw_read_unlock_bh);#endif
#ifndef CONFIG_INLINE_WRITE_TRYLOCKnoinline int __lockfunc _raw_write_trylock(rwlock_t *lock){ return __raw_write_trylock(lock);}EXPORT_SYMBOL(_raw_write_trylock);#endif
#ifndef CONFIG_INLINE_WRITE_LOCKnoinline void __lockfunc _raw_write_lock(rwlock_t *lock){ __raw_write_lock(lock);}EXPORT_SYMBOL(_raw_write_lock);
#ifndef CONFIG_DEBUG_LOCK_ALLOC#define __raw_write_lock_nested(lock, subclass) __raw_write_lock(((void)(subclass), (lock)))#endif
void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass){ __raw_write_lock_nested(lock, subclass);}EXPORT_SYMBOL(_raw_write_lock_nested);#endif
#ifndef CONFIG_INLINE_WRITE_LOCK_IRQSAVEnoinline unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock){ return __raw_write_lock_irqsave(lock);}EXPORT_SYMBOL(_raw_write_lock_irqsave);#endif
#ifndef CONFIG_INLINE_WRITE_LOCK_IRQnoinline void __lockfunc _raw_write_lock_irq(rwlock_t *lock){ __raw_write_lock_irq(lock);}EXPORT_SYMBOL(_raw_write_lock_irq);#endif
#ifndef CONFIG_INLINE_WRITE_LOCK_BHnoinline void __lockfunc _raw_write_lock_bh(rwlock_t *lock){ __raw_write_lock_bh(lock);}EXPORT_SYMBOL(_raw_write_lock_bh);#endif
#ifndef CONFIG_INLINE_WRITE_UNLOCKnoinline void __lockfunc _raw_write_unlock(rwlock_t *lock){ __raw_write_unlock(lock);}EXPORT_SYMBOL(_raw_write_unlock);#endif
#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTOREnoinline void __lockfunc _raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags){ __raw_write_unlock_irqrestore(lock, flags);}EXPORT_SYMBOL(_raw_write_unlock_irqrestore);#endif
#ifndef CONFIG_INLINE_WRITE_UNLOCK_IRQnoinline void __lockfunc _raw_write_unlock_irq(rwlock_t *lock){ __raw_write_unlock_irq(lock);}EXPORT_SYMBOL(_raw_write_unlock_irq);#endif
#ifndef CONFIG_INLINE_WRITE_UNLOCK_BHnoinline void __lockfunc _raw_write_unlock_bh(rwlock_t *lock){ __raw_write_unlock_bh(lock);}EXPORT_SYMBOL(_raw_write_unlock_bh);#endif
#endif /* !CONFIG_PREEMPT_RT */
#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);}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(lock, do_raw_spin_trylock, do_raw_spin_lock); return flags;}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);}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;}EXPORT_SYMBOL(in_lock_functions);
#if defined(CONFIG_PROVE_LOCKING) && defined(CONFIG_PREEMPT_RT)void notrace lockdep_assert_in_softirq_func(void){ lockdep_assert_in_softirq();}EXPORT_SYMBOL(lockdep_assert_in_softirq_func);#endif