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arch: Remove spin_unlock_wait() arch-specific 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 the underlying arch-specific
arch_spin_unlock_wait() for all architectures providing them.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: <linux-arch@vger.kernel.org>
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>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney
2017-06-29 15:53:02 -07:00
parent d3a024abbc
commit 952111d7db
21 changed files with 5 additions and 241 deletions
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23
arch/tile/lib/spinlock_32.c
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@@ -62,29 +62,6 @@ int arch_spin_trylock(arch_spinlock_t *lock)
}
EXPORT_SYMBOL(arch_spin_trylock);
void arch_spin_unlock_wait(arch_spinlock_t *lock)
{
u32 iterations = 0;
int curr = READ_ONCE(lock->current_ticket);
int next = READ_ONCE(lock->next_ticket);
/* Return immediately if unlocked. */
if (next == curr)
return;
/* Wait until the current locker has released the lock. */
do {
delay_backoff(iterations++);
} while (READ_ONCE(lock->current_ticket) == curr);
/*
* The TILE architecture doesn't do read speculation; therefore
* a control dependency guarantees a LOAD->{LOAD,STORE} order.
*/
barrier();
}
EXPORT_SYMBOL(arch_spin_unlock_wait);
/*
* The low byte is always reserved to be the marker for a "tns" operation
* since the low bit is set to "1" by a tns. The next seven bits are