efi: Autoload efivars
The original patch is from Ben Hutchings's contribution to debian kernel. Got Ben's permission to remove the code of efi-pstore.c and send to linux-efi: https://github.com/BlankOn/linux-debian/blob/master/debian/patches/features/all/efi-autoload-efivars.patch efivars is generally useful to have on EFI systems, and in some cases it may be impossible to load it after a kernel upgrade in order to complete a boot loader update. At the same time we don't want to waste memory on non-EFI systems by making them built-in. Instead, give them module aliases as if they are platform drivers, and register a corresponding platform device whenever EFI runtime services are available. This should trigger udev to load them. Signed-off-by: NLee, Chun-Yi <jlee@suse.com> Cc: Ben Hutchings <ben@decadent.org.uk> Tested-by: NArd Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
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