mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Peter Zijlstra](/assets/img/avatar_default.png)
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
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
|
|
* Mutexes: blocking mutual exclusion locks
|
|
*
|
|
* started by Ingo Molnar:
|
|
*
|
|
* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*
|
|
* This file contains mutex debugging related internal declarations,
|
|
* prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
|
|
* More details are in kernel/mutex-debug.c.
|
|
*/
|
|
|
|
/*
|
|
* This must be called with lock->wait_lock held.
|
|
*/
|
|
extern void debug_mutex_lock_common(struct mutex *lock,
|
|
struct mutex_waiter *waiter);
|
|
extern void debug_mutex_wake_waiter(struct mutex *lock,
|
|
struct mutex_waiter *waiter);
|
|
extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
|
|
extern void debug_mutex_add_waiter(struct mutex *lock,
|
|
struct mutex_waiter *waiter,
|
|
struct thread_info *ti);
|
|
extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
|
|
struct thread_info *ti);
|
|
extern void debug_mutex_unlock(struct mutex *lock);
|
|
extern void debug_mutex_init(struct mutex *lock, const char *name,
|
|
struct lock_class_key *key);
|
|
|
|
static inline void mutex_set_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = current;
|
|
}
|
|
|
|
static inline void mutex_clear_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = NULL;
|
|
}
|
|
|
|
#define spin_lock_mutex(lock, flags) \
|
|
do { \
|
|
struct mutex *l = container_of(lock, struct mutex, wait_lock); \
|
|
\
|
|
DEBUG_LOCKS_WARN_ON(in_interrupt()); \
|
|
local_irq_save(flags); \
|
|
arch_spin_lock(&(lock)->rlock.raw_lock);\
|
|
DEBUG_LOCKS_WARN_ON(l->magic != l); \
|
|
} while (0)
|
|
|
|
#define spin_unlock_mutex(lock, flags) \
|
|
do { \
|
|
arch_spin_unlock(&(lock)->rlock.raw_lock); \
|
|
local_irq_restore(flags); \
|
|
preempt_check_resched(); \
|
|
} while (0)
|