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locking: Remove spin_unlock_wait() generic definitions

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There is no agreed-upon definition of spin_unlock_wait()'s semantics,
and it appears that all callers could do just as well with a lock/unlock
pair.  This commit therefore removes spin_unlock_wait() and related
definitions from core code.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Andrea Parri <parri.andrea@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul E. McKenney 2017-06-29 15:47:44 -07:00
parent a4f08141d0
commit d3a024abbc
4 changed files with 0 additions and 148 deletions
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14
include/asm-generic/qspinlock.h
View file

@ -21,17 +21,6 @@
#include <asm-generic/qspinlock_types.h>
/**
* queued_spin_unlock_wait - wait until the _current_ lock holder releases the lock
* @lock : Pointer to queued spinlock structure
*
* There is a very slight possibility of live-lock if the lockers keep coming
* and the waiter is just unfortunate enough to not see any unlock state.
*/
#ifndef queued_spin_unlock_wait
extern void queued_spin_unlock_wait(struct qspinlock *lock);
#endif
/**
* queued_spin_is_locked - is the spinlock locked?
* @lock: Pointer to queued spinlock structure
@ -41,8 +30,6 @@ extern void queued_spin_unlock_wait(struct qspinlock *lock);
static __always_inline int queued_spin_is_locked(struct qspinlock *lock)
{
/*
* See queued_spin_unlock_wait().
*
* Any !0 state indicates it is locked, even if _Q_LOCKED_VAL
* isn't immediately observable.
*/
@ -135,6 +122,5 @@ static __always_inline bool virt_spin_lock(struct qspinlock *lock)
#define arch_spin_trylock(l) queued_spin_trylock(l)
#define arch_spin_unlock(l) queued_spin_unlock(l)
#define arch_spin_lock_flags(l, f) queued_spin_lock(l)
#define arch_spin_unlock_wait(l) queued_spin_unlock_wait(l)
#endif /* __ASM_GENERIC_QSPINLOCK_H */