7608a43d8f
4badad35 ("locking/mutex: Disable optimistic spinning on some
architectures") added a ARCH_SUPPORTS_ATOMIC_RMW flag to
disable the mutex optimistic feature on specific archs.
Because CONFIG_MUTEX_SPIN_ON_OWNER only depended on DEBUG and
SMP, it was ok to have the ->owner field conditional a bit
flexible. However by adding a new variable to the matter,
we can waste space with the unused field, ie: CONFIG_SMP &&
(!CONFIG_MUTEX_SPIN_ON_OWNER && !CONFIG_DEBUG_MUTEX).
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Jason Low <jason.low2@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: aswin@hp.com
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jason Low <jason.low2@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/1406752916-3341-5-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
48 lines
1.3 KiB
C
48 lines
1.3 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 prototypes, for the
|
|
* !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
|
|
*/
|
|
|
|
#define spin_lock_mutex(lock, flags) \
|
|
do { spin_lock(lock); (void)(flags); } while (0)
|
|
#define spin_unlock_mutex(lock, flags) \
|
|
do { spin_unlock(lock); (void)(flags); } while (0)
|
|
#define mutex_remove_waiter(lock, waiter, ti) \
|
|
__list_del((waiter)->list.prev, (waiter)->list.next)
|
|
|
|
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
|
|
static inline void mutex_set_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = current;
|
|
}
|
|
|
|
static inline void mutex_clear_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = NULL;
|
|
}
|
|
#else
|
|
static inline void mutex_set_owner(struct mutex *lock)
|
|
{
|
|
}
|
|
|
|
static inline void mutex_clear_owner(struct mutex *lock)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#define debug_mutex_wake_waiter(lock, waiter) do { } while (0)
|
|
#define debug_mutex_free_waiter(waiter) do { } while (0)
|
|
#define debug_mutex_add_waiter(lock, waiter, ti) do { } while (0)
|
|
#define debug_mutex_unlock(lock) do { } while (0)
|
|
#define debug_mutex_init(lock, name, key) do { } while (0)
|
|
|
|
static inline void
|
|
debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
|
|
{
|
|
}
|