Commit c301a2e2 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Greg Kroah-Hartman
Browse files

samples/kobject: add is_visible() callback to attribute group 



There was no example for the is_visible() callback so far.

It will also become an example and test for the constification of
'struct attribute' later.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20251029-sysfs-const-attr-prep-v5-5-ea7d745acff4@weissschuh.net


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7dd9fdb4

samples/kobject/kset-example.c

+16 −1
Original line number Diff line number Diff line
@@ -178,7 +178,22 @@ static struct attribute *foo_default_attrs[] = { 
	&bar_attribute.attr,

	NULL,	/* need to NULL terminate the list of attributes */

};

ATTRIBUTE_GROUPS(foo_default);



static umode_t foo_default_attrs_is_visible(struct kobject *kobj,

					    struct attribute *attr,

					    int n)

{

	/* Hide attributes with the same name as the kobject. */

	if (strcmp(kobject_name(kobj), attr->name) == 0)

		return 0;

	return attr->mode;

}



static const struct attribute_group foo_default_group = {

	.attrs		= foo_default_attrs,

	.is_visible	= foo_default_attrs_is_visible,

};

__ATTRIBUTE_GROUPS(foo_default);



/*

 * Our own ktype for our kobjects.  Here we specify our sysfs ops, the