x86/nmi: Accumulate NMI-progress evidence in exc_nmi()

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CPUs ignoring NMIs is often a sign of those CPUs going bad, but there
are quite a few other reasons why a CPU might ignore NMIs.  Therefore,
accumulate evidence within exc_nmi() as to what might be preventing a
given CPU from responding to an NMI.

[ paulmck: Apply Peter Zijlstra feedback. ]

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Paul E. McKenney 2022-12-16 15:57:51 -08:00

parent 1b929c02af

commit 1a3ea611fc

2 changed files with 45 additions and 1 deletions

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35

arch/x86/kernel/nmi.c

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11

lib/Kconfig.debug

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