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

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Date:   Tue, 08 Nov 2016 11:46:35 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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"

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 ?

cheers