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https://github.com/torvalds/linux.git
synced 2026-10-07 22:37:45 -04:00
Minchan Kim
4a57d6bbae
In preparation for converting bit_spin_lock to rwlock in zsmalloc so that multiple writers of zspages can run at the same time but those zspages are supposed to be different zspage instance. Thus, it's not deadlock. This patch adds write_lock_nested to support the case for LOCKDEP. [[email protected]: fix write_lock_nested for RT] Link: https://lkml.kernel.org/r/[email protected] [[email protected]: fixup write_lock_nested() implementation] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Minchan Kim <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Sebastian Andrzej Siewior <[email protected]> Tested-by: Sebastian Andrzej Siewior <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Sergey Senozhatsky <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Naresh Kamboju <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
285 lines
7.9 KiB
C
285 lines
7.9 KiB
C
#ifndef __LINUX_RWLOCK_API_SMP_H
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#define __LINUX_RWLOCK_API_SMP_H
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#ifndef __LINUX_SPINLOCK_API_SMP_H
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# error "please don't include this file directly"
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#endif
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/*
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* include/linux/rwlock_api_smp.h
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*
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* spinlock API declarations on SMP (and debug)
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* (implemented in kernel/spinlock.c)
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*
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* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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* Released under the General Public License (GPL).
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*/
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void __lockfunc _raw_read_lock(rwlock_t *lock) __acquires(lock);
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void __lockfunc _raw_write_lock(rwlock_t *lock) __acquires(lock);
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void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass) __acquires(lock);
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void __lockfunc _raw_read_lock_bh(rwlock_t *lock) __acquires(lock);
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void __lockfunc _raw_write_lock_bh(rwlock_t *lock) __acquires(lock);
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void __lockfunc _raw_read_lock_irq(rwlock_t *lock) __acquires(lock);
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void __lockfunc _raw_write_lock_irq(rwlock_t *lock) __acquires(lock);
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unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
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__acquires(lock);
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unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
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__acquires(lock);
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int __lockfunc _raw_read_trylock(rwlock_t *lock);
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int __lockfunc _raw_write_trylock(rwlock_t *lock);
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void __lockfunc _raw_read_unlock(rwlock_t *lock) __releases(lock);
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void __lockfunc _raw_write_unlock(rwlock_t *lock) __releases(lock);
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void __lockfunc _raw_read_unlock_bh(rwlock_t *lock) __releases(lock);
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void __lockfunc _raw_write_unlock_bh(rwlock_t *lock) __releases(lock);
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void __lockfunc _raw_read_unlock_irq(rwlock_t *lock) __releases(lock);
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void __lockfunc _raw_write_unlock_irq(rwlock_t *lock) __releases(lock);
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void __lockfunc
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_raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
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__releases(lock);
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void __lockfunc
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_raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
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__releases(lock);
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#ifdef CONFIG_INLINE_READ_LOCK
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#define _raw_read_lock(lock) __raw_read_lock(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_LOCK
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#define _raw_write_lock(lock) __raw_write_lock(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_LOCK_BH
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#define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_LOCK_BH
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#define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_LOCK_IRQ
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#define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
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#define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
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#define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
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#define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_TRYLOCK
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#define _raw_read_trylock(lock) __raw_read_trylock(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_TRYLOCK
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#define _raw_write_trylock(lock) __raw_write_trylock(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_UNLOCK
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#define _raw_read_unlock(lock) __raw_read_unlock(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_UNLOCK
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#define _raw_write_unlock(lock) __raw_write_unlock(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_UNLOCK_BH
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#define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
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#define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
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#define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
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#endif
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#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
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#define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
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#endif
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#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
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#define _raw_read_unlock_irqrestore(lock, flags) \
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__raw_read_unlock_irqrestore(lock, flags)
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#endif
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#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
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#define _raw_write_unlock_irqrestore(lock, flags) \
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__raw_write_unlock_irqrestore(lock, flags)
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#endif
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static inline int __raw_read_trylock(rwlock_t *lock)
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{
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preempt_disable();
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if (do_raw_read_trylock(lock)) {
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rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
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return 1;
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}
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preempt_enable();
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return 0;
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}
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static inline int __raw_write_trylock(rwlock_t *lock)
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{
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preempt_disable();
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if (do_raw_write_trylock(lock)) {
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rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
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return 1;
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}
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preempt_enable();
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return 0;
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}
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/*
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* If lockdep is enabled then we use the non-preemption spin-ops
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* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
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* not re-enabled during lock-acquire (which the preempt-spin-ops do):
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*/
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#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
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static inline void __raw_read_lock(rwlock_t *lock)
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{
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preempt_disable();
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rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
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}
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static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
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{
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unsigned long flags;
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local_irq_save(flags);
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preempt_disable();
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rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
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return flags;
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}
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static inline void __raw_read_lock_irq(rwlock_t *lock)
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{
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local_irq_disable();
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preempt_disable();
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rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
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}
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static inline void __raw_read_lock_bh(rwlock_t *lock)
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{
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__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
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rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
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}
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static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
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{
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unsigned long flags;
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local_irq_save(flags);
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preempt_disable();
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rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
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return flags;
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}
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static inline void __raw_write_lock_irq(rwlock_t *lock)
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{
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local_irq_disable();
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preempt_disable();
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rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
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}
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static inline void __raw_write_lock_bh(rwlock_t *lock)
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{
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__local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
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rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
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}
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static inline void __raw_write_lock(rwlock_t *lock)
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{
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preempt_disable();
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rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
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}
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static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
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{
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preempt_disable();
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rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
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LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
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}
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#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
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static inline void __raw_write_unlock(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_write_unlock(lock);
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preempt_enable();
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}
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static inline void __raw_read_unlock(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_read_unlock(lock);
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preempt_enable();
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}
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static inline void
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__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_read_unlock(lock);
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local_irq_restore(flags);
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preempt_enable();
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}
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static inline void __raw_read_unlock_irq(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_read_unlock(lock);
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local_irq_enable();
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preempt_enable();
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}
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static inline void __raw_read_unlock_bh(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_read_unlock(lock);
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__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
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}
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static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
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unsigned long flags)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_write_unlock(lock);
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local_irq_restore(flags);
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preempt_enable();
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}
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static inline void __raw_write_unlock_irq(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_write_unlock(lock);
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local_irq_enable();
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preempt_enable();
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}
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static inline void __raw_write_unlock_bh(rwlock_t *lock)
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{
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rwlock_release(&lock->dep_map, _RET_IP_);
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do_raw_write_unlock(lock);
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__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
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}
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#endif /* __LINUX_RWLOCK_API_SMP_H */
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