linux-kernel - [PATCH 0/5] rcu/sched: Fix ignored rescheduling after rcu_eqs

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Date:   Mon,  1 Feb 2021 00:05:43 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E . McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>, stable@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 0/5] rcu/sched: Fix ignored rescheduling after rcu_eqs_enter() v4

So, here is a hopefully improved version with the following changes:

* No more late wake up debugging, objtool should debug that later with
  noinstr code calling into the scheduler (Peter suggestion)

* Dropped the double rdp fetch patch, just keep the fix part for now

* Properly protect irq work call from rcu_user_enter() inside
  instrumention_begin()

* Handle CONFIG_KVM_XFER_TO_GUEST_WORK (as per Peter suggestion)

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	sched/idle-v4

HEAD: d3e956d0b693a572bd5f56241816a6390c5b2797

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers
      rcu/nocb: Perform deferred wake up before last idle's need_resched() check
      rcu/nocb: Trigger self-IPI on late deferred wake up before user resume
      entry: Explicitly flush pending rcuog wakeup before last rescheduling point
      entry/kvm: Explicitly flush pending rcuog wakeup before last rescheduling point


 arch/x86/kvm/x86.c        |  1 +
 include/linux/entry-kvm.h | 14 +++++++++++++
 include/linux/rcupdate.h  |  2 ++
 kernel/entry/common.c     |  7 +++++++
 kernel/rcu/tree.c         | 53 ++++++++++++++++++++++++++++++++++++++++++++++-
 kernel/rcu/tree.h         |  2 +-
 kernel/rcu/tree_plugin.h  | 31 +++++++++++++++++++--------
 kernel/sched/idle.c       |  3 +++
 8 files changed, 102 insertions(+), 11 deletions(-)