linux-kernel - [tip: timers/core] lib/irq_poll: Declare IRQ_POLL softirq vector as ksoftirqd-parking safe

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Date:   Mon, 14 Mar 2022 09:28:14 -0000
From:   "tip-bot2 for Frederic Weisbecker" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/core] lib/irq_poll: Declare IRQ_POLL softirq vector as
 ksoftirqd-parking safe

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     f96272a90d9eaea9933aaab704ddbd258feb3841
Gitweb:        https://git.kernel.org/tip/f96272a90d9eaea9933aaab704ddbd258feb3841
Author:        Frederic Weisbecker <frederic@...nel.org>
AuthorDate:    Tue, 08 Feb 2022 17:16:35 +01:00
Committer:     Frederic Weisbecker <frederic@...nel.org>
CommitterDate: Mon, 07 Mar 2022 23:53:50 +01:00

lib/irq_poll: Declare IRQ_POLL softirq vector as ksoftirqd-parking safe

The following warning may appear while setting a CPU down:

	NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!

The IRQ_POLL_SOFTIRQ vector can be raised during the hotplug cpu_down()
path after ksoftirqd is parked and before the CPU actually dies. However
this is handled afterward at the CPUHP_IRQ_POLL_DEAD stage where the
queue gets migrated.

Hence this warning can be considered spurious and the vector can join
the "hotplug-safe" list.

Reported-and-tested-by: Paul Menzel <pmenzel@...gen.mpg.de>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Paul Menzel <pmenzel@...gen.mpg.de>
---
 include/linux/interrupt.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 9613326..f40754c 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -580,12 +580,15 @@ enum
 };
 
 /*
- * Ignoring the RCU vector after ksoftirqd is parked is fine
- * because:
- * 	1) rcutree_migrate_callbacks() takes care of the queue.
+ * The following vectors can be safely ignored after ksoftirqd is parked:
+ *
+ * _ RCU:
+ * 	1) rcutree_migrate_callbacks() migrates the queue.
  * 	2) rcu_report_dead() reports the final quiescent states.
+ *
+ * _ IRQ_POLL: irq_poll_cpu_dead() migrates the queue
  */
-#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(RCU_SOFTIRQ))
+#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(RCU_SOFTIRQ) | BIT(IRQ_POLL_SOFTIRQ))
 
 /* map softirq index to softirq name. update 'softirq_to_name' in
  * kernel/softirq.c when adding a new softirq.