linux-kernel - Re: PREEMPT_RT causes scheduling errors with f

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Message-ID: <YiSlDqqk0gnUouWd@kroah.com>
Date:   Sun, 6 Mar 2022 13:11:58 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yunhao Tian <t123yh.xyz@...il.com>
Cc:     linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: PREEMPT_RT causes scheduling errors with f_rndis USB gadget

On Sun, Mar 06, 2022 at 06:57:08PM +0800, Yunhao Tian wrote:
> Greg KH <gregkh@...uxfoundation.org> 于2022年3月6日周日 18:36写道：
> >
> > On Sun, Mar 06, 2022 at 06:17:54PM +0800, Yunhao Tian wrote:
> > > Hi everyone,
> > >
> > > I'm using Linux 5.15.24-rt31 kernel with PREEMPT_RT enabled, on my
> > > RK3308 board. I set up f_rndis gadget with the following script, and
> > > plugged my board to a x86 Linux computer running 5.15.25 kernel:
> >
> > Does the same thing happen with the non-rt kernel?
> >
> > thanks,
> >
> > greg k-h
> 
> Hi Greg,
> 
> Thanks for your reply!
> 
> This doesn't happen to non-rt kernel. It will only happen when
> PREEMPT_RT is turned on, with rt kernel.

Great, thanks for letting us know.  I'll let you work this out with the
-rt developers :)