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efi: split efisubsystem from efivars

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This registers /sys/firmware/efi/{,systab,efivars/} whenever EFI is enabled
and the system is booted with EFI.

This allows
 *) userspace to check for the existence of /sys/firmware/efi as a way
    to determine whether or it is running on an EFI system.
 *) 'mount -t efivarfs none /sys/firmware/efi/efivars' without manually
    loading any modules.

[ Also, move the efivar API into vars.c and unconditionally compile it.
  This allows us to move efivars.c, which now only contains the sysfs
  variable code, into the firmware/efi directory. Note that the efivars.c
  filename is kept to maintain backwards compatability with the old
  efivars.ko module. With this patch it is now possible for efivarfs
  to be built without CONFIG_EFI_VARS - Matt ]

Cc: Seiji Aguchi <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Mike Waychison <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Jeremy Kerr <[email protected]>
Cc: Matthew Garrett <[email protected]>
Cc: Chun-Yi Lee <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Tobias Powalowski <[email protected]>
Signed-off-by: Tom Gundersen <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
This commit is contained in:
Tom Gundersen 2013-02-08 15:37:06 +00:00 • committed by Matt Fleming
commit a9499fa7cd
8 changed files with 769 additions and 761 deletions
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2
fs/efivarfs/Kconfig
View file

@ -1,6 +1,6 @@
config EFIVAR_FS
tristate "EFI Variable filesystem"
depends on EFI_VARS
depends on EFI
help
efivarfs is a replacement filesystem for the old EFI
variable support via sysfs, as it doesn't suffer from the