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f98a3dccfc
parisc, ia64 and powerpc32 are the only remaining architectures that
provide custom arch_{spin,read,write}_lock_flags() functions, which are
meant to re-enable interrupts while waiting for a spinlock.
However, none of these can actually run into this codepath, because
it is only called on architectures without CONFIG_GENERIC_LOCKBREAK,
or when CONFIG_DEBUG_LOCK_ALLOC is set without CONFIG_LOCKDEP, and none
of those combinations are possible on the three architectures.
Going back in the git history, it appears that arch/mn10300 may have
been able to run into this code path, but there is a good chance that
it never worked. On the architectures that still exist, it was
already impossible to hit back in 2008 after the introduction of
CONFIG_GENERIC_LOCKBREAK, and possibly earlier.
As this is all dead code, just remove it and the helper functions built
around it. For arch/ia64, the inline asm could be cleaned up, but
it seems safer to leave it untouched.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Link: https://lore.kernel.org/r/20211022120058.1031690-1-arnd@kernel.org
276 lines
7.6 KiB
C
276 lines
7.6 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_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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#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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