|From:||Andrew Morton <akpm-AT-linux-foundation.org>|
|To:||Greg KH <gregkh-AT-suse.de>|
|Subject:||Re: [GIT PATCH] UIO patches for 2.6.21|
|Date:||Fri, 27 Apr 2007 16:04:25 -0700|
|Cc:||Linus Torvalds <torvalds-AT-linux-foundation.org>, linux-kernel-AT-vger.kernel.org, tglx-AT-linutronix.de, Benedikt Spranger <b.spranger-AT-linutronix.de>, "Hans J. Koch" <hjk-AT-linutronix.de>|
On Fri, 27 Apr 2007 15:49:57 -0700 Greg KH <firstname.lastname@example.org> wrote: > Here are the updated UIO (Userspace I/O driver framework) patches for > 2.6.21. I'm a bit uncertain about the whole UIO idea, really. I have this vague feeling that we'd prefer to encourage people to move device drivers into GPL'ed kernel rather than encouraging them to do closed-source userspace implementations which will probably end up being slower, less reliable and unavailable on various architectures, distros, etc. But I don't think I have the capacity to actually think about this further - just tossing it out there ;) > They have been revamped from the last time you have seen them, and they > include a real driver, the Hilscher CIF DeviceNet and Profibus card > controller, which is being used in production systems with this driver > framework right now. The kernel driver they replaced was a total mess, > with over 60+ ioctls to try to control the different aspects of the > device. See the last patch in this series for more details on this > driver. > > These patches include full documentation, are self-contained from the > rest of the kernel, and have been in the -mm tree for the past few > months with no complaints. > > Please pull from: > master.kernel.org:/pub/scm/linux/kernel/git/gregkh/uio-2.6.git/ > > Patches will be sent as a follow-on to this message to lkml for people > to see. > > drivers/uio/uio_cif.c | 156 ++++++++ eh? How come a particular device requires 156 lines of kernel code to support a userspace driver? Doesn't that kind of defeat the point?
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