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-rw-r--r--kernel/Documentation/filesystems/efivarfs.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/Documentation/filesystems/efivarfs.txt b/kernel/Documentation/filesystems/efivarfs.txt
index c477af086..686a64bba 100644
--- a/kernel/Documentation/filesystems/efivarfs.txt
+++ b/kernel/Documentation/filesystems/efivarfs.txt
@@ -14,3 +14,10 @@ filesystem.
efivarfs is typically mounted like this,
mount -t efivarfs none /sys/firmware/efi/efivars
+
+Due to the presence of numerous firmware bugs where removing non-standard
+UEFI variables causes the system firmware to fail to POST, efivarfs
+files that are not well-known standardized variables are created
+as immutable files. This doesn't prevent removal - "chattr -i" will work -
+but it does prevent this kind of failure from being accomplished
+accidentally.