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rcu/nocb: EXP Check use and usefulness of ->nocb_lock_contended

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Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-07-13 12:27:03 -07:00
parent d1b222c6be
commit 6aacd88d17
1 changed files with 3 additions and 1 deletions
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4
kernel/rcu/tree_plugin.h
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@ -1515,6 +1515,7 @@ static void rcu_nocb_bypass_lock(struct rcu_data *rdp)
if (raw_spin_trylock(&rdp->nocb_bypass_lock))
return;
atomic_inc(&rdp->nocb_lock_contended);
WARN_ON_ONCE(smp_processor_id() != rdp->cpu);
smp_mb__after_atomic(); /* atomic_inc() before lock. */
raw_spin_lock(&rdp->nocb_bypass_lock);
smp_mb__before_atomic(); /* atomic_dec() after lock. */
@ -1533,7 +1534,8 @@ static void rcu_nocb_bypass_lock(struct rcu_data *rdp)
*/
static void rcu_nocb_wait_contended(struct rcu_data *rdp)
{
while (atomic_read(&rdp->nocb_lock_contended))
WARN_ON_ONCE(smp_processor_id() != rdp->cpu);
while (WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended)))
cpu_relax();
}