driver core: documentation: make it clear that sysfs is optional
The original text suggested that sysfs is mandatory and always compiled in the kernel. Signed-off-by: NLucian Adrian Grijincu <lgrijincu@ixiacom.com> Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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