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locking: Remove smp_read_barrier_depends() from queued_spin_lock_slowpath()

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commit 548095dea6 upstream.

Queued spinlocks are not used by DEC Alpha, and furthermore operations
such as READ_ONCE() and release/relaxed RMW atomics are being changed
to imply smp_read_barrier_depends().  This commit therefore removes the
now-redundant smp_read_barrier_depends() from queued_spin_lock_slowpath(),
and adjusts the comments accordingly.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney
2018-12-18 18:13:51 +01:00
committed by Greg Kroah-Hartman
parent f02ef68bda
commit a9febd662c
1 changed files with 5 additions and 7 deletions
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12
kernel/locking/qspinlock.c
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@@ -170,7 +170,7 @@ static __always_inline void clear_pending_set_locked(struct qspinlock *lock)
* @tail : The new queue tail code word
* Return: The previous queue tail code word
*
* xchg(lock, tail)
* xchg(lock, tail), which heads an address dependency
*
* p,*,* -> n,*,* ; prev = xchg(lock, node)
*/
@@ -417,13 +417,11 @@ queue:
if (old & _Q_TAIL_MASK) {
prev = decode_tail(old);
/*
* The above xchg_tail() is also a load of @lock which generates,
* through decode_tail(), a pointer.
*
* The address dependency matches the RELEASE of xchg_tail()
* such that the access to @prev must happen after.
* The above xchg_tail() is also a load of @lock which
* generates, through decode_tail(), a pointer. The address
* dependency matches the RELEASE of xchg_tail() such that
* the subsequent access to @prev happens after.
*/
smp_read_barrier_depends();
WRITE_ONCE(prev->next, node);