1# SPDX-License-Identifier: GPL-2.0-only 2config SYSFS 3 bool "sysfs file system support" if EXPERT 4 default y 5 select KERNFS 6 help 7 The sysfs filesystem is a virtual filesystem that the kernel uses to 8 export internal kernel objects, their attributes, and their 9 relationships to one another. 10 11 Users can use sysfs to ascertain useful information about the running 12 kernel, such as the devices the kernel has discovered on each bus and 13 which driver each is bound to. sysfs can also be used to tune devices 14 and other kernel subsystems. 15 16 Some system agents rely on the information in sysfs to operate. 17 /sbin/hotplug uses device and object attributes in sysfs to assist in 18 delegating policy decisions, like persistently naming devices. 19 20 sysfs is currently used by the block subsystem to mount the root 21 partition. If sysfs is disabled you must specify the boot device on 22 the kernel boot command line via its major and minor numbers. For 23 example, "root=03:01" for /dev/hda1. 24 25 Designers of embedded systems may wish to say N here to conserve space. 26