d974d905cb
Commit e66eed651f ("list: remove prefetching from regular list
iterators") removed the include of prefetch.h from list.h and this was a
path to including asm/processor.h. We need to include it excplicitly
now.
Fixes this build error on sparc32 (at least):
In file included from include/linux/seqlock.h:29,
from include/linux/time.h:8,
from include/linux/timex.h:56,
from include/linux/sched.h:57,
from arch/sparc/kernel/asm-offsets.c:13:
include/linux/spinlock.h: In function 'spin_unlock_wait':
include/linux/spinlock.h:360: error: implicit declaration of function 'cpu_relax
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
#ifndef __LINUX_SPINLOCK_UP_H
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#define __LINUX_SPINLOCK_UP_H
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#ifndef __LINUX_SPINLOCK_H
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# error "please don't include this file directly"
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#endif
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#include <asm/processor.h> /* for cpu_relax() */
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/*
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* include/linux/spinlock_up.h - UP-debug version of spinlocks.
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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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* In the debug case, 1 means unlocked, 0 means locked. (the values
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* are inverted, to catch initialization bugs)
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*
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* No atomicity anywhere, we are on UP.
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*/
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#ifdef CONFIG_DEBUG_SPINLOCK
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#define arch_spin_is_locked(x) ((x)->slock == 0)
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static inline void arch_spin_lock(arch_spinlock_t *lock)
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{
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lock->slock = 0;
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}
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static inline void
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arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
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{
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local_irq_save(flags);
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lock->slock = 0;
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}
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static inline int arch_spin_trylock(arch_spinlock_t *lock)
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{
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char oldval = lock->slock;
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lock->slock = 0;
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return oldval > 0;
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}
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static inline void arch_spin_unlock(arch_spinlock_t *lock)
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{
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lock->slock = 1;
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}
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/*
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* Read-write spinlocks. No debug version.
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*/
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#define arch_read_lock(lock) do { (void)(lock); } while (0)
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#define arch_write_lock(lock) do { (void)(lock); } while (0)
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#define arch_read_trylock(lock) ({ (void)(lock); 1; })
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#define arch_write_trylock(lock) ({ (void)(lock); 1; })
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#define arch_read_unlock(lock) do { (void)(lock); } while (0)
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#define arch_write_unlock(lock) do { (void)(lock); } while (0)
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#else /* DEBUG_SPINLOCK */
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#define arch_spin_is_locked(lock) ((void)(lock), 0)
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/* for sched.c and kernel_lock.c: */
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# define arch_spin_lock(lock) do { (void)(lock); } while (0)
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# define arch_spin_lock_flags(lock, flags) do { (void)(lock); } while (0)
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# define arch_spin_unlock(lock) do { (void)(lock); } while (0)
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# define arch_spin_trylock(lock) ({ (void)(lock); 1; })
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#endif /* DEBUG_SPINLOCK */
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#define arch_spin_is_contended(lock) (((void)(lock), 0))
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#define arch_read_can_lock(lock) (((void)(lock), 1))
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#define arch_write_can_lock(lock) (((void)(lock), 1))
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#define arch_spin_unlock_wait(lock) \
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do { cpu_relax(); } while (arch_spin_is_locked(lock))
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#endif /* __LINUX_SPINLOCK_UP_H */
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