x86/mce/dev-mcelog: Dynamically allocate space for machine check records

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We have had a hard coded limit of 32 machine check records since the
dawn of time.  But as numbers of cores increase, it is possible for
more than 32 errors to be reported before a user process reads from
/dev/mcelog. In this case the additional errors are lost.

Keep 32 as the minimum. But tune the maximum value up based on the
number of processors.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200218184408.GA23048@agluck-desk2.amr.corp.intel.com

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Tony Luck 2020-02-18 10:44:08 -08:00 • committed by Borislav Petkov

parent 2976908e41

commit d8ecca4043

2 changed files with 30 additions and 23 deletions

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6

arch/x86/include/asm/mce.h

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47

arch/x86/kernel/cpu/mce/dev-mcelog.c

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