linux-kernel - [PATCH 0/3] rcu: Fix yet another wake up from offline related issue

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Message-ID: <20241002145738.38226-1-frederic@kernel.org>
Date: Wed,  2 Oct 2024 16:57:35 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Neeraj Upadhyay <neeraj.upadhyay@....com>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	rcu <rcu@...r.kernel.org>
Subject: [PATCH 0/3] rcu: Fix yet another wake up from offline related issue

Hi,

A new warning has been reported due to swake_up_one_online() use
from an offline IRQ:

	https://lore.kernel.org/oe-lkp/202409231644.4c55582d-lkp@intel.com

Here is a tentative fix.

Similar issue can happen with exp kthread and GP kthread if offline tick
fires and there is a pending deferred quiescent state to report on
PREEMPT_RCU. Currently only oneshot ticks are disabled while the CPU is
offlining. I have yet to take care of the periodic tick implementation.
Work in progress...

Frederic Weisbecker (3):
  rcu/nocb: Use switch/case on NOCB timer state machine
  rcu/nocb: Fix rcuog wake-up from offline softirq
  rcu: Report callbacks enqueued on offline CPU blind spot

 kernel/rcu/tree.c      |  3 +++
 kernel/rcu/tree.h      |  1 +
 kernel/rcu/tree_nocb.h | 47 +++++++++++++++++++++++++++++++-----------
 3 files changed, 39 insertions(+), 12 deletions(-)

-- 
2.46.0