linux-kernel - [PATCH RFC tip/core/rcu 0/2] Fix RCU idle-exit problem and comment

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Date:   Thu, 12 Mar 2020 19:40:07 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: [PATCH RFC tip/core/rcu 0/2] Fix RCU idle-exit problem and comment

Hello!

This series fixes a brown-paper-bag NMI self-deadlock bug located by
Thomas Gleixner and adds comments:

1.	Don't acquire lock in NMI handler in rcu_nmi_enter_common().

2.	Add comments marking transitions between RCU watching and not.

These pass light rcutorture testing, and seem like v5.8 material.

							Thanx, Paul

------------------------------------------------------------------------

 tree.c |   31 ++++++++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 5 deletions(-)