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rcu: Invert passed_quiesce and rename to cpu_no_qs

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This commit inverts the sense of the rcu_data structure's ->passed_quiesce
field and renames it to ->cpu_no_qs.  This will allow a later commit to
use an "aggregate OR" operation to test expedited as well as normal grace
periods without added overhead.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-08-06 14:17:29 -07:00
parent 97c668b8e9
commit 0d43eb34f9
5 changed files with 33 additions and 33 deletions
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6
kernel/rcu/tree_plugin.h
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@ -265,11 +265,11 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp,
*/
static void rcu_preempt_qs(void)
{
if (!__this_cpu_read(rcu_data_p->passed_quiesce)) {
if (__this_cpu_read(rcu_data_p->cpu_no_qs)) {
trace_rcu_grace_period(TPS("rcu_preempt"),
__this_cpu_read(rcu_data_p->gpnum),
TPS("cpuqs"));
__this_cpu_write(rcu_data_p->passed_quiesce, 1);
__this_cpu_write(rcu_data_p->cpu_no_qs, false);
barrier(); /* Coordinate with rcu_preempt_check_callbacks(). */
current->rcu_read_unlock_special.b.need_qs = false;
}
@ -620,7 +620,7 @@ static void rcu_preempt_check_callbacks(void)
}
if (t->rcu_read_lock_nesting > 0 &&
__this_cpu_read(rcu_data_p->core_needs_qs) &&
!__this_cpu_read(rcu_data_p->passed_quiesce))
__this_cpu_read(rcu_data_p->cpu_no_qs))
t->rcu_read_unlock_special.b.need_qs = true;
}