• Bartlomiej Zolnierkiewicz's avatar
    x86, mce: don't log boot MCEs on Pentium M (model == 13) CPUs · c7f6fa44
    Bartlomiej Zolnierkiewicz authored
    On my legacy Pentium M laptop (Acer Extensa 2900) I get bogus MCE on a cold
    boot with CONFIG_X86_NEW_MCE enabled, i.e. (after decoding it with mcelog):
    
    MCE 0
    HARDWARE ERROR. This is *NOT* a software problem!
    Please contact your hardware vendor
    CPU 0 BANK 1 MCG status:
    MCi status:
    Error overflow
    Uncorrected error
    Error enabled
    Processor context corrupt
    MCA: Data CACHE Level-1 UNKNOWN Error
    STATUS f200000000000195 MCGSTATUS 0
    
    [ The other STATUS values observed: f2000000000001b5 (... UNKNOWN error)
      and f200000000000115 (... READ Error).
    
      To verify that this is not a CONFIG_X86_NEW_MCE bug I also modified
      the CONFIG_X86_OLD_MCE code (which doesn't log any MCEs) to dump
      content of STATUS MSR before it is cleared during initialization. ]
    
    Since the bogus MCE results in a kernel taint (which in turn disables
    lockdep support) don't log boot MCEs on Pentium M (model == 13) CPUs
    by default ("mce=bootlog" boot parameter can be be used to get the old
    behavior).
    Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
    Reviewed-by: default avatarAndi Kleen <andi@firstfloor.org>
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    c7f6fa44
mce.c 46.6 KB