[PATCH 6/7] efi: efivars: limit availability to X86 builds

From: Ard Biesheuvel
Date: Wed Sep 23 2020 - 12:15:28 EST


CONFIG_EFI_VARS controls the code that exposes EFI variables via
sysfs entries, which was deprecated before support for non-Intel
architectures was added to EFI. So let's limit its availability
to Intel architectures for the time being, and hopefully remove
it entirely in the not too distant future.

Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
Documentation/arm/uefi.rst | 2 +-
drivers/firmware/efi/Kconfig | 13 ++++---------
2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/Documentation/arm/uefi.rst b/Documentation/arm/uefi.rst
index f868330df6be..f732f957421f 100644
--- a/Documentation/arm/uefi.rst
+++ b/Documentation/arm/uefi.rst
@@ -23,7 +23,7 @@ makes it possible for the kernel to support additional features:
For actually enabling [U]EFI support, enable:

- CONFIG_EFI=y
-- CONFIG_EFI_VARS=y or m
+- CONFIG_EFIVAR_FS=y or m

The implementation depends on receiving information about the UEFI environment
in a Flattened Device Tree (FDT) - so is only available with CONFIG_OF.
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 80f5c67e3638..da1887f72a51 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -4,20 +4,15 @@ menu "EFI (Extensible Firmware Interface) Support"

config EFI_VARS
tristate "EFI Variable Support via sysfs"
- depends on EFI
+ depends on EFI && (X86 || IA64)
default n
help
If you say Y here, you are able to get EFI (Extensible Firmware
Interface) variable information via sysfs. You may read,
write, create, and destroy EFI variables through this interface.
-
- Note that using this driver in concert with efibootmgr requires
- at least test release version 0.5.0-test3 or later, which is
- available from:
- <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
-
- Subsequent efibootmgr releases may be found at:
- <http://github.com/vathpela/efibootmgr>
+ Note that this driver is only retained for compatibility with
+ legacy users: new users should use the efivarfs filesystem
+ instead.

config EFI_ESRT
bool
--
2.17.1