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| author |   Paul E. McKenney <paulmck@kernel.org> | 2021-01-27 13:57:16 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-03-08 14:21:41 -0800 |
| commit | 7308e0240410d3644c9d7cc6263079a58e3effeb (patch) | |
| tree | a6586d7044ef9e1bac4c3779a87b75d119874717 | |
| parent | rcutorture: Fix testing of RCU priority boosting (diff) | |
| download | linux-dev-7308e0240410d3644c9d7cc6263079a58e3effeb.tar.xz linux-dev-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>
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 1 |
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. |