summaryrefslogtreecommitdiffstats
path: root/kernel/rcu
diff options
context:
space:
mode:
authorPaul E. McKenney <paulmck@kernel.org>2021-01-27 22:57:16 +0100
committerPaul E. McKenney <paulmck@kernel.org>2021-03-08 23:21:41 +0100
commit7308e0240410d3644c9d7cc6263079a58e3effeb (patch)
treea6586d7044ef9e1bac4c3779a87b75d119874717 /kernel/rcu
parentrcutorture: Fix testing of RCU priority boosting (diff)
downloadlinux-7308e0240410d3644c9d7cc6263079a58e3effeb.tar.xz
linux-7308e0240410d3644c9d7cc6263079a58e3effeb.zip
rcu: Make rcu_read_unlock_special() expedite strict grace periods
In kernels built with CONFIG_RCU_STRICT_GRACE_PERIOD=y, every grace period is an expedited grace period. However, rcu_read_unlock_special() does not treat them that way, instead allowing the deferred quiescent state to be reported whenever. This commit therefore adds a check of this Kconfig option that causes rcu_read_unlock_special() to treat all grace periods as expedited for CONFIG_RCU_STRICT_GRACE_PERIOD=y kernels. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree_plugin.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index e17cb233bfc9..a21c41cc86ad 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -615,6 +615,7 @@ static void rcu_read_unlock_special(struct task_struct *t)
expboost = (t->rcu_blocked_node && READ_ONCE(t->rcu_blocked_node->exp_tasks)) ||
(rdp->grpmask & READ_ONCE(rnp->expmask)) ||
+ IS_ENABLED(CONFIG_RCU_STRICT_GRACE_PERIOD) ||
(IS_ENABLED(CONFIG_RCU_BOOST) && irqs_were_disabled &&
t->rcu_blocked_node);
// Need to defer quiescent state until everything is enabled.