svn commit: r192535 - head/sys/kern

John Baldwin jhb at
Fri May 22 13:21:42 UTC 2009

On Thursday 21 May 2009 6:11:02 pm Attilio Rao wrote:
> At this point I wonder what's the purpose of maintaining the sleeping
> version for such functions?

Actually, I still very much do not like using M_NOWAIT needlessly.  I would 
much rather the solution for make_dev() be that the 1 or 2 places that need 
to do it with a mutex held instead queue a task to do the actual make_dev() 
in a taskqueue when no locks are held.  This is basically what 
destroy_dev_sched() is doing.  Perhaps a make_dev_sched() with a similar 
callback to be called on completion would be better.  Having a device driver 
do all the work to setup the hardware only to fail to create a node in /dev 
so that userland can actually use it is pretty rediculous and useless.

John Baldwin

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