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2747b93ebb
From: Michael S. Tsirkin <mst@redhat.com> The check for __LINUX_SPINLOCK_H within rwlock.h (and other files) detects the direct include of the header file if it is at the very beginning of the include section. If it is listed later then chances are high that spinlock.h was already included (including rwlock.h) and the additional listing of rwlock.h will not cause any failure. On PREEMPT_RT this additional rwlock.h will lead to compile failures since it uses a different rwlock implementation. Add __LINUX_INSIDE_SPINLOCK_H to spinlock.h and check for this instead of __LINUX_SPINLOCK_H to detect wrong includes. This will help detect direct includes of rwlock.h with without PREEMPT_RT enabled. [ bigeasy: add remaining __LINUX_SPINLOCK_H user and rewrite commit description. ] Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/YweemHxJx7O8rjBx@linutronix.de
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
#ifndef __LINUX_RWLOCK_H
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#define __LINUX_RWLOCK_H
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#ifndef __LINUX_INSIDE_SPINLOCK_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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* rwlock related methods
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*
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* split out from spinlock.h
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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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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void __rwlock_init(rwlock_t *lock, const char *name,
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struct lock_class_key *key);
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# define rwlock_init(lock) \
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do { \
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static struct lock_class_key __key; \
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\
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__rwlock_init((lock), #lock, &__key); \
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} while (0)
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#else
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# define rwlock_init(lock) \
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do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
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extern int do_raw_read_trylock(rwlock_t *lock);
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extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
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extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
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extern int do_raw_write_trylock(rwlock_t *lock);
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extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
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#else
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# define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
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# define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock)
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# define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
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# define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
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# define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock)
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# define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
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#endif
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/*
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* Define the various rw_lock methods. Note we define these
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* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
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* methods are defined as nops in the case they are not required.
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*/
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#define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock))
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#define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock))
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#define write_lock(lock) _raw_write_lock(lock)
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#define read_lock(lock) _raw_read_lock(lock)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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#define write_lock_nested(lock, subclass) _raw_write_lock_nested(lock, subclass)
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#else
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#define write_lock_nested(lock, subclass) _raw_write_lock(lock)
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#endif
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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#define read_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _raw_read_lock_irqsave(lock); \
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} while (0)
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#define write_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _raw_write_lock_irqsave(lock); \
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} while (0)
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#else
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#define read_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_read_lock_irqsave(lock, flags); \
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} while (0)
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#define write_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_write_lock_irqsave(lock, flags); \
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} while (0)
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#endif
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#define read_lock_irq(lock) _raw_read_lock_irq(lock)
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#define read_lock_bh(lock) _raw_read_lock_bh(lock)
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#define write_lock_irq(lock) _raw_write_lock_irq(lock)
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#define write_lock_bh(lock) _raw_write_lock_bh(lock)
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#define read_unlock(lock) _raw_read_unlock(lock)
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#define write_unlock(lock) _raw_write_unlock(lock)
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#define read_unlock_irq(lock) _raw_read_unlock_irq(lock)
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#define write_unlock_irq(lock) _raw_write_unlock_irq(lock)
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#define read_unlock_irqrestore(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_read_unlock_irqrestore(lock, flags); \
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} while (0)
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#define read_unlock_bh(lock) _raw_read_unlock_bh(lock)
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#define write_unlock_irqrestore(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_write_unlock_irqrestore(lock, flags); \
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} while (0)
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#define write_unlock_bh(lock) _raw_write_unlock_bh(lock)
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#define write_trylock_irqsave(lock, flags) \
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({ \
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local_irq_save(flags); \
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write_trylock(lock) ? \
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1 : ({ local_irq_restore(flags); 0; }); \
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})
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#ifdef arch_rwlock_is_contended
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#define rwlock_is_contended(lock) \
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arch_rwlock_is_contended(&(lock)->raw_lock)
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#else
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#define rwlock_is_contended(lock) ((void)(lock), 0)
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#endif /* arch_rwlock_is_contended */
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#endif /* __LINUX_RWLOCK_H */
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