linux-kernel - Re: [GIT PULL rcu/urgent] Don't acquire lock in NMI handler (v5.7)

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Date:   Tue, 14 Apr 2020 08:37:39 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        rcu@...r.kernel.org, joel@...lfernandes.org
Subject: Re: [GIT PULL rcu/urgent] Don't acquire lock in NMI handler (v5.7)

* Paul E. McKenney <paulmck@...nel.org> wrote:

> Hello!
> 
> This pull request contains a single commit that avoid acquiring
> a lock when rcu_nmi_enter_common() is invoked from an NMI handler.
> This issue can of course result in self-deadlock, and the fix is quite
> straightforward.  I am therefore putting it forward for the current
> release (v5.7) instead of following my normal process, which would
> delay it until v5.8.
> 
> This fix has been subjected to rcutorture, kbuild test robot, and -next
> testing and is available at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git urgent-for-mingo
> 
> for you to fetch changes up to bf37da98c51825c90432d340e135cced37a7460d:
> 
>   rcu: Don't acquire lock in NMI handler in rcu_nmi_enter_common() (2020-04-05 14:22:15 -0700)
> 
> ----------------------------------------------------------------
> Paul E. McKenney (1):
>       rcu: Don't acquire lock in NMI handler in rcu_nmi_enter_common()
> 
>  kernel/rcu/tree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Pulled into tip:core/urgent, thanks Paul!

	Ingo