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

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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()
This commit is contained in:
Linus Torvalds
2023-02-23 09:28:37 -08:00
parent 192a5e0a19 344da544f1
commit 525445efac
4 changed files with 128 additions and 1 deletions
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11
lib/Kconfig.debug
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@ -1562,6 +1562,17 @@ config TRACE_IRQFLAGS_NMI
depends on TRACE_IRQFLAGS
depends on TRACE_IRQFLAGS_NMI_SUPPORT
config NMI_CHECK_CPU
bool "Debugging for CPUs failing to respond to backtrace requests"
depends on DEBUG_KERNEL
depends on X86
default n
help
Enables debug prints when a CPU fails to respond to a given
backtrace NMI. These prints provide some reasons why a CPU
might legitimately be failing to respond, for example, if it
is offline of if ignore_nmis is set.
config DEBUG_IRQFLAGS
bool "Debug IRQ flag manipulation"
help