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Revert "rcu/nocb: Fix rcuog wake-up from offline softirq"

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This reverts commit f7345ccc62.

swake_up_one_online() has been removed because hrtimers can now assign
a proper online target to hrtimers queued from offline CPUs. Therefore
remove the related hackery.

Link: https://lore.kernel.org/all/20241231170712.149394-4-frederic@kernel.org/
Reviewed-by: Usama Arif <usamaarif642@gmail.com>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
This commit is contained in:
Frederic Weisbecker 2024-12-31 18:07:12 +01:00 committed by Joel Fernandes
parent 9520371e3d
commit b95d15980a
1 changed files with 1 additions and 7 deletions
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8
kernel/rcu/tree_nocb.h
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@ -554,19 +554,13 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
rcu_nocb_unlock(rdp);
wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE_LAZY,
TPS("WakeLazy"));
} else if (!irqs_disabled_flags(flags) && cpu_online(rdp->cpu)) {
} else if (!irqs_disabled_flags(flags)) {
/* ... if queue was empty ... */
rcu_nocb_unlock(rdp);
wake_nocb_gp(rdp, false);
trace_rcu_nocb_wake(rcu_state.name, rdp->cpu,
TPS("WakeEmpty"));
} else {
/*
* Don't do the wake-up upfront on fragile paths.
* Also offline CPUs can't call swake_up_one_online() from
* (soft-)IRQs. Rely on the final deferred wake-up from
* rcutree_report_cpu_dead()
*/
rcu_nocb_unlock(rdp);
wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE,
TPS("WakeEmptyIsDeferred"));