forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

driver/base: implement subsys_virtual_register()

Browse source 
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.

This patch implements subsys_virtual_register() by factoring out
subsys_register() from subsys_system_register() and using it with
virtual_device_parent() as the origin directory.  It's identical to
subsys_system_register() other than the origin directory but we aren't
gonna restrict the device names which should be used under it.

This will be used to expose workqueue attributes to userland.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
This commit is contained in:
Tejun Heo 2013-03-12 11:30:05 -07:00
parent 6dbe51c251
commit d73ce00422
4 changed files with 72 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/base/core.c
View file

@ -690,7 +690,7 @@ void device_initialize(struct device *dev)
set_dev_node(dev, -1);
}
static struct kobject *virtual_device_parent(struct device *dev)
struct kobject *virtual_device_parent(struct device *dev)
{
static struct kobject *virtual_dir = NULL;