These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / filesystems / efivarfs.txt

diff --git a/kernel/Documentation/filesystems/efivarfs.txt b/kernel/Documentation/filesystems/efivarfs.txt
index c477af0..686a64b 100644 (file)
--- 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.