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Date:   Wed, 6 Dec 2017 12:30:44 -0800
From:   tip-bot for Dave Young <>
Subject: [tip:efi/urgent] efi: Add comment to avoid future expanding of
 sysfs systab

Commit-ID:  0b02e448a2ebb46eb9be4f1bdfc87112bd420cbf
Author:     Dave Young <>
AuthorDate: Wed, 6 Dec 2017 09:50:10 +0000
Committer:  Ingo Molnar <>
CommitDate: Wed, 6 Dec 2017 19:32:23 +0100

efi: Add comment to avoid future expanding of sysfs systab

/sys/firmware/efi/systab shows several different values, it breaks sysfs
one file one value design.  But since there are already userspace tools
depend on it eg. kexec-tools so add code comment to alert future expanding
of this file.

Signed-off-by: Dave Young <>
Signed-off-by: Ard Biesheuvel <>
Reviewed-by: Greg Kroah-Hartman <>
Cc: H. Peter Anvin <>
Cc: Linus Torvalds <>
Cc: Matt Fleming <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Ingo Molnar <>
 drivers/firmware/efi/efi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index c3eefa1..557a478 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -109,6 +109,8 @@ struct kobject *efi_kobj;
  * Let's not leave out systab information that snuck into
  * the efivars driver
+ * Note, do not add more fields in systab sysfs file as it breaks sysfs
+ * one value per file rule!
 static ssize_t systab_show(struct kobject *kobj,
 			   struct kobj_attribute *attr, char *buf)

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