x86/mce: Make mce_timed_out() identify holdout CPUs

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The

  "Timeout: Not all CPUs entered broadcast exception handler"

message will appear from time to time given enough systems, but this
message does not identify which CPUs failed to enter the broadcast
exception handler. This information would be valuable if available,
for example, in order to correlate with other hardware-oriented error
messages.

Add a cpumask of CPUs which maintains which CPUs have entered this
handler, and print out which ones failed to enter in the event of a
timeout.

 [ bp: Massage. ]

Reported-by: Jonathan Lemon <bsd@fb.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20210106174102.GA23874@paulmck-ThinkPad-P72

...

This commit is contained in:

Paul E. McKenney 2020-12-23 17:04:19 -08:00 • committed by Borislav Petkov

parent e71ba9452f

commit 7bb39313cd

1 changed files with 14 additions and 1 deletions

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arch/x86/kernel/cpu/mce/core.c

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