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From: Greg KH <greg@kroah.com>
To: Jorge Fernandez Monteagudo <jorgefm@cirsa.com>
Cc: "kernelnewbies@kernelnewbies.org" <kernelnewbies@kernelnewbies.org>
Subject: Re: How to replace set_fs(KERNEL_DS) for a kernel 5.10.x module driver version
Date: Tue, 12 Jan 2021 11:26:26 +0100	[thread overview]
Message-ID: <X/15UtDqBoX8RIw1@kroah.com> (raw)
In-Reply-To: <DB9PR10MB452259065E8697A9BE5AE9B8A1AA0@DB9PR10MB4522.EURPRD10.PROD.OUTLOOK.COM>

On Tue, Jan 12, 2021 at 09:55:01AM +0000, Jorge Fernandez Monteagudo wrote:
> >Patents have almost nothing to do with licenses, we have many things in
> >the Linux kernel that are under a GPLv2 license that have patents issued
> >for (and are actively enforced.)  The GPL can, and does, work with the
> >patent system, so if that's a reason that any company tries to give for
> >not releasing kernel code, it's very misinformed.
> 
> Well, I think the only the reason not to publish the code was because
> it's a driver for a custom hardware with no interest outside our
> department...

Doesn't matter, we take drivers for anything, as long as someone is
using the hardware.

> > Anyway, off-topic but I figured I would try to clear that up.
> 
> I was wondering that with the current limitation, there is no way to
> call functions in a driver as the cdc-acm from other drivers as the
> dummy I sent. Maybe our driver was designed the way is to avoid
> latencies from context switching if the code were in userspace... It's
> only a guess...

You are dealing with USB speeds and latencies, kernel syscall issues are
the least of your worries here.

thanks,

greg k-h

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      reply	other threads:[~2021-01-12 10:25 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-12  7:21 How to replace set_fs(KERNEL_DS) for a kernel 5.10.x module driver version Jorge Fernandez Monteagudo
2021-01-12  7:29 ` Greg KH
2021-01-12  7:39   ` Jorge Fernandez Monteagudo
2021-01-12  8:16     ` Greg KH
2021-01-12  8:26       ` Jorge Fernandez Monteagudo
2021-01-12  8:56         ` Greg KH
2021-01-12  9:12           ` Jorge Fernandez Monteagudo
2021-01-12  9:28             ` Greg KH
2021-01-12  9:55               ` Jorge Fernandez Monteagudo
2021-01-12 10:26                 ` Greg KH [this message]

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