linux-kernel - [PATCH 0/3] timers & RCU: Fix TREE03 stalls

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Message-ID: <20231218231916.11719-1-frederic@kernel.org>
Date: Tue, 19 Dec 2023 00:19:13 +0100
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>,
	Uladzislau Rezki <urezki@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	rcu <rcu@...r.kernel.org>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/3] timers & RCU: Fix TREE03 stalls

5c0930ccaad5 ("hrtimers: Push pending hrtimers away from outgoing CPU earlier")
has introduced an issue with RCU. This is a proposal to solve the
situation after realizing that fixing that on the timers side wouldn't
be pretty to say the least.

Oh and the last patch is absolutely irrelevant to the issue...

Frederic Weisbecker (3):
  hrtimer: Report offline hrtimer enqueue
  rcu: Defer RCU kthreads wakeup when CPU is dying
  rcu/exp: Remove full barrier upon main thread wakeup

 include/linux/hrtimer.h |  3 ++-
 kernel/rcu/tree.c       | 34 +++++++++++++++++++++++++++++++++-
 kernel/rcu/tree_exp.h   |  8 +++-----
 kernel/time/hrtimer.c   |  3 +++
 4 files changed, 41 insertions(+), 7 deletions(-)

-- 
2.42.1