* [PATCH] efi: add comment to avoid future expanding of sysfs systab
@ 2017-12-05 9:42 Dave Young
2017-12-05 10:16 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Dave Young @ 2017-12-05 9:42 UTC (permalink / raw)
To: Ard Biesheuvel, Matt Fleming; +Cc: linux-efi, linux-kernel, gregkh
/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 <dyoung@redhat.com>
---
drivers/firmware/efi/efi.c | 2 ++
1 file changed, 2 insertions(+)
--- linux-x86.orig/drivers/firmware/efi/efi.c
+++ linux-x86/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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2017-12-05 9:42 [PATCH] efi: add comment to avoid future expanding of sysfs systab Dave Young
2017-12-05 10:16 ` Greg KH
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