efivarfs: Move to fs/efivarfs

Now that efivarfs uses the efivar API, move it out of efivars.c and
into fs/efivarfs where it belongs. This move will eventually allow us
to enable the efivarfs code without having to also enable
CONFIG_EFI_VARS built, and vice versa.

Furthermore, things like,

    mount -t efivarfs none /sys/firmware/efi/efivars

will now work if efivarfs is built as a module without requiring the
use of MODULE_ALIAS(), which would have been necessary when the
efivarfs code was part of efivars.c.

Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/efivarfs/Kconfig b/fs/efivarfs/Kconfig
new file mode 100644
index 000000000000..1fb2b7f849f3
--- /dev/null
+++ b/fs/efivarfs/Kconfig
@@ -0,0 +1,12 @@
+config EFIVAR_FS
+        tristate "EFI Variable filesystem"
+        depends on EFI_VARS
+        help
+          efivarfs is a replacement filesystem for the old EFI
+          variable support via sysfs, as it doesn't suffer from the
+          same 1024-byte variable size limit.
+
+          To compile this file system support as a module, choose M
+          here. The module will be called efivarfs.
+
+          If unsure, say N.