Re: [PATCH] RFC: Attributes in /sys/cdev

[Patrick Mochel]

> BTW, I suspect that we need a way to say "this kobject and its children
> will *never* have any attributes and will never be seen in sysfs".  There
> are quite a few uses when we keep kobject as a refcounting vehicle, etc.,
> but have nothing meaningful to show in sysfs tree.  Keep in mind that
> sysfs nodes (including attributes) are not free - it's struct inode +
> struct dentry at the very least.  Both pinned down and permanently mapped...

There is already - use kobject_init() to initialize the refcount to 1, and 
kobject_put() to clean it up. (kobject_add() and kobject_del() can be used 
to later add/remove it from the sysfs hierarchy). 

Or, since those objects will probably never get added to sysfs, and since 
few objects are ever promoted, we may just want to create a new, smaller 
object purely for the refcounting vehicle.. 


	Pat

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