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rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers 

commit 54b7429efffc99e845ba9381bee3244f012a06c2 upstream.

Deferred wakeup of rcuog kthreads upon RCU idle mode entry is going to
be handled differently whether initiated by idle, user or guest. Prepare
with pulling that control up to rcu_eqs_enter() callers.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20210131230548.32970-2-frederic@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frederic Weisbecker 2021-02-01 00:05:44 +01:00 committed by Greg Kroah-Hartman
parent 14122331b1
commit 3cd9a74bea
1 changed files with 10 additions and 1 deletions
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11
kernel/rcu/tree.c
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@ -579,7 +579,6 @@ static void rcu_eqs_enter(bool user)
trace_rcu_dyntick(TPS("Start"), rdp->dynticks_nesting, 0, atomic_read(&rdp->dynticks));
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
rdp = this_cpu_ptr(&rcu_data);
do_nocb_deferred_wakeup(rdp);
rcu_prepare_for_idle();
rcu_preempt_deferred_qs(current);
WRITE_ONCE(rdp->dynticks_nesting, 0); /* Avoid irq-access tearing. */
@ -600,7 +599,10 @@ static void rcu_eqs_enter(bool user)
*/
void rcu_idle_enter(void)
{
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
lockdep_assert_irqs_disabled();
do_nocb_deferred_wakeup(rdp);
rcu_eqs_enter(false);
}
@ -618,7 +620,14 @@ void rcu_idle_enter(void)
*/
void rcu_user_enter(void)
{
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
lockdep_assert_irqs_disabled();
instrumentation_begin();
do_nocb_deferred_wakeup(rdp);
instrumentation_end();
rcu_eqs_enter(true);
}
#endif /* CONFIG_NO_HZ_FULL */