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x86/nmi: Accumulate NMI-progress evidence in exc_nmi()
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>
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Paul E. McKenney
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Jan 19, 2023
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