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    x86, reboot: Add EFI and CF9 reboot methods into the default list · a4f1987e
    Li, Aubrey 提交于
    Reboot is the last service linux OS provides to the end user. We are
    supposed to make this function more robust than today. This patch adds
    all of the known reboot methods into the default attempt list. The
    machines requiring reboot=efi or reboot=p or reboot=bios get a chance
    to reboot automatically now.
    
    If there is a new reboot method emerged, we are supposed to add it to
    the default list as well, instead of adding the endless dmidecode entry.
    
    If one method required is in the default list in this patch but the
    machine reboot still hangs, that means some methods ahead of the
    required method cause the system hangs, then reboot the machine by
    passing reboot= arguments and submit the reboot dmidecode table quirk.
    
    We are supposed to remove the reboot dmidecode table from the kernel,
    but to be safe, we keep it. This patch prevents us from adding more.
    If you happened to have a machine listed in the reboot dmidecode
    table and this patch makes reboot work on your machine, please submit
    a patch to remove the quirk.
    
    The default reboot order with this patch is now:
    
        ACPI > KBD > ACPI > KBD > EFI > CF9_COND > BIOS
    
    Because BIOS and TRIPLE are mutually exclusive (either will either
    work or hang the machine) that method is not included.
    
    [ hpa: as with any changes to the reboot order, this patch will have
      to be monitored carefully for regressions. ]
    Signed-off-by: NAubrey Li <aubrey.li@intel.com>
    Acked-by: NMatthew Garrett <mjg59@srcf.ucam.org>
    Link: http://lkml.kernel.org/r/53130A46.1010801@linux.intel.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
    a4f1987e
reboot.c 19.1 KB