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c6eb3dda25
Since we now have p->on_cpu unconditionally available, use it to re-implement mutex_spin_on_owner. Requested-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frank Rowand <frank.rowand@am.sony.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110405152728.826338173@chello.nl
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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* Mutexes: blocking mutual exclusion locks
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*
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* started by Ingo Molnar:
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*
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* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*
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* This file contains mutex debugging related internal declarations,
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* prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
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* More details are in kernel/mutex-debug.c.
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*/
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/*
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* This must be called with lock->wait_lock held.
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*/
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extern void debug_mutex_lock_common(struct mutex *lock,
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struct mutex_waiter *waiter);
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extern void debug_mutex_wake_waiter(struct mutex *lock,
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struct mutex_waiter *waiter);
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extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
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extern void debug_mutex_add_waiter(struct mutex *lock,
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struct mutex_waiter *waiter,
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struct thread_info *ti);
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extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
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struct thread_info *ti);
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extern void debug_mutex_unlock(struct mutex *lock);
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extern void debug_mutex_init(struct mutex *lock, const char *name,
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struct lock_class_key *key);
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static inline void mutex_set_owner(struct mutex *lock)
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{
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lock->owner = current;
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}
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static inline void mutex_clear_owner(struct mutex *lock)
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{
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lock->owner = NULL;
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}
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#define spin_lock_mutex(lock, flags) \
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do { \
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struct mutex *l = container_of(lock, struct mutex, wait_lock); \
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\
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DEBUG_LOCKS_WARN_ON(in_interrupt()); \
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local_irq_save(flags); \
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arch_spin_lock(&(lock)->rlock.raw_lock);\
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DEBUG_LOCKS_WARN_ON(l->magic != l); \
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} while (0)
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#define spin_unlock_mutex(lock, flags) \
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do { \
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arch_spin_unlock(&(lock)->rlock.raw_lock); \
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local_irq_restore(flags); \
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preempt_check_resched(); \
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} while (0)
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