Re: [PATCH 30/31] driver/base: implement subsys_virtual_register()

Greg Kroah-Hartman
2013-03-02T18:17:15Z

On Fri, Mar 01, 2013 at 07:24:21PM -0800, Tejun Heo wrote:
> Kay tells me the most appropriate place to expose workqueues to
> userland would be /sys/devices/virtual/workqueues/WQ_NAME which is
> symlinked to /sys/bus/workqueue/devices/WQ_NAME and that we're lacking
> a way to do that outside of driver core as virtual_device_parent()
> isn't exported and there's no inteface to conveniently create a
> virtual subsystem.

I'm almost afraid to ask what you want to export to userspace for a
workqueue that userspace would care about...

If you create a subsystem, the devices will show up under the virtual
"bus" if you don't give them a parent, so this patch shouldn't be
needed, unless you are abusing the driver model. What am I missing
here?

thanks,

greg k-h