Merge tag 'nmi.2023.02.14a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull x86 NMI diagnostics from Paul McKenney:
 "Add diagnostics to the x86 NMI handler to help detect NMI-handler bugs
  on the one hand and failing hardware on the other"

* tag 'nmi.2023.02.14a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  x86/nmi: Print reasons why backtrace NMIs are ignored
  x86/nmi: Accumulate NMI-progress evidence in exc_nmi()