linux-kernel - Re: [PATCH] kernel/panic: Drop unblank

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Message-ID: <Yw9W6qYo6Acg7rad@linutronix.de>
Date:   Wed, 31 Aug 2022 14:41:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Xuezhi Zhang <zhangxuezhi1@...lpad.com>,
        Yangxi Xiang <xyangxi5@...il.com>,
        nick black <dankamongmen@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Marco Elver <elver@...gle.com>,
        John Ogness <john.ogness@...utronix.de>,
        David Gow <davidgow@...gle.com>,
        tangmeng <tangmeng@...ontech.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH] kernel/panic: Drop unblank_screen call

On 2022-08-30 16:50:04 [+0200], Daniel Vetter wrote:
> Long story short, I have no idea why the direct call to unblank_screen
> survived for so long (the infrastructure to do it properly existed for
> years), nor why it wasn't removed when the console_unblank() call was
> finally added. But it makes a ton more sense to finally do that than
> not - it's just better encapsulation to go through the console
> functions instead of doing a direct call, so let's dare. Plus it
> really does not make much sense to call the only unblank
> implementation there is twice, once without, and once with appropriate
> locking.

Yup, calling it twice is redundant. 
The only difference I see is that the console implementation relies on
CONFIG_VT_CONSOLE while the former relied only on CONFIG_VT. There
should be no console output without CONFIG_VT_CONSOLE so no need to
unblank it.

Acked-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Sebastian