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| author |   Tony Luck <tony.luck@intel.com> | 2020-02-18 10:44:08 -0800 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-03-10 10:25:14 +0100 |
| commit | d8ecca4043f2d9d89daab7915eca8c2ec6254d0f (patch) | |
| tree | 8c2f8fc25eec3c76eecb2aecfd0cbe1a16e60f40 /arch/x86/include/asm/mce.h | |
| parent | x86/mce: Do not log spurious corrected mce errors (diff) | |
| download | wireguard-linux-d8ecca4043f2d9d89daab7915eca8c2ec6254d0f.tar.xz wireguard-linux-d8ecca4043f2d9d89daab7915eca8c2ec6254d0f.zip | |
x86/mce/dev-mcelog: Dynamically allocate space for machine check records
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
Diffstat (limited to 'arch/x86/include/asm/mce.h')
| -rw-r--r-- | arch/x86/include/asm/mce.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index 4359b955e0b7..9d5b09913ef3 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -102,7 +102,7 @@ #define MCE_OVERFLOW 0 /* bit 0 in flags means overflow */ -#define MCE_LOG_LEN 32 +#define MCE_LOG_MIN_LEN 32U #define MCE_LOG_SIGNATURE "MACHINECHECK" /* AMD Scalable MCA */ @@ -135,11 +135,11 @@ */ struct mce_log_buffer { char signature[12]; /* "MACHINECHECK" */ - unsigned len; /* = MCE_LOG_LEN */ + unsigned len; /* = elements in .mce_entry[] */ unsigned next; unsigned flags; unsigned recordlen; /* length of struct mce */ - struct mce entry[MCE_LOG_LEN]; + struct mce entry[]; }; enum mce_notifier_prios { |