linux-kernel - Re: [PATCH] Revert "console: don't prefer first registered if DT specifies stdout-path"

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Date:   Thu, 10 Nov 2016 15:14:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Burton <paul.burton@...tec.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Tejun Heo <tj@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "console: don't prefer first registered if DT
 specifies stdout-path"

On Tue, Nov 08, 2016 at 08:00:32AM +0100, Greg Kroah-Hartman wrote:
> On Tue, Nov 08, 2016 at 11:46:35AM +1100, Michael Ellerman wrote:
> > Hans de Goede <hdegoede@...hat.com> writes:
> > 
> > > This reverts commit 05fd007e4629 ("console: don't prefer first registered
> > > if DT specifies stdout-path").
> > >
> > > The reverted commit changes existing behavior on which many ARM boards
> > > rely. Many ARM small-board-computers, like e.g. the Raspberry Pi have
> > > both a video output and a serial console. Depending on whether the user
> > > is using the device as a more regular computer; or as a headless device
> > > we need to have the console on either one or the other.
> > >
> > > Many users rely on the kernel behavior of the console being present on
> > > both outputs, before the reverted commit the console setup with no
> > > console= kernel arguments on an ARM board which sets stdout-path in dt
> > > would look like this:
> > >
> > > [root@...alhost ~]# cat /proc/consoles
> > > ttyS0                -W- (EC p a)    4:64
> > > tty0                 -WU (E  p  )    4:1
> > >
> > > Where as after the reverted commit, it looks like this:
> > >
> > > [root@...alhost ~]# cat /proc/consoles
> > > ttyS0                -W- (EC p a)    4:64
> > >
> > > This commit reverts commit 05fd007e4629 ("console: don't prefer first
> > > registered if DT specifies stdout-path") restoring the original behavior.
> > >
> > > Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> > 
> > This is also breaking various powerpc systems.
> > 
> > Linus can you please merge this revert for 4.9 ?
> 
> I'll queue it up with other tty changes for 4.9-final.

Oops, wait, it's going through Andrew's tree, nevermind...