linux-kernel - [GIT PULL] RCU fixes for v6.7-rc1

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Message-ID: <ZUoX2lAwknn9JkEm@lothringen>
Date:   Tue, 7 Nov 2023 11:56:26 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        Boqun Feng <boqun.feng@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Neeraj Upadhyay <neeraj.upadhyay@....com>,
        Uladzislau Rezki <urezki@...il.com>,
        Z qiang <qiang.zhang1211@...il.com>
Subject: [GIT PULL] RCU fixes for v6.7-rc1

Hello Linus,

Please pull the latest RCU git tree from:

  git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git tags/rcu-fixes-v6.7

for you to fetch changes up to a80712b9cc7e57830260ec5e1feb9cdb59e1da2f:

  rcu/tasks-trace: Handle new PF_IDLE semantics (2023-11-01 22:12:03 +0100)

----------------------------------------------------------------
RCU fixes for v6.7

* Fix a lock inversion between scheduler and RCU introduced
  in v6.2-rc4. The scenario could trigger on any user of RCU_NOCB
  (mostly Android and also nohz_full).

* Fix PF_IDLE semantic changes introduced in v6.6-rc3 breaking some
  RCU-Tasks and RCU-Tasks-Trace expectations as to what exactly is
  an idle task. This resulted in potential spurious stalls and
  warnings.

----------------------------------------------------------------
Frederic Weisbecker (3):
      rcu: Introduce rcu_cpu_online()
      rcu/tasks: Handle new PF_IDLE semantics
      rcu/tasks-trace: Handle new PF_IDLE semantics

Peter Zijlstra (1):
      rcu: Break rcu_node_0 --> &rq->__lock order

 kernel/rcu/rcu.h   |  2 ++
 kernel/rcu/tasks.h | 32 +++++++++++++++++++++++++++++---
 kernel/rcu/tree.c  | 43 ++++++++++++++++++++++++++++++++-----------
 3 files changed, 63 insertions(+), 14 deletions(-)