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

[Paul E. McKenney]

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(-)