linux-kernel - Re: [PATCH v9 4/4] console: Make persistent scrollback a boot parameter

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Date:   Tue, 10 Jan 2017 23:58:46 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     Manuel Schölling <manuel.schoelling@....de>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com, lkml14@...tdoyle.com,
        rdunlap@...radead.org, shorne@...il.com, andrey_utkin@...tmail.com,
        akpm@...ux-foundation.org, paul.burton@...tec.com,
        daniel.vetter@...ll.ch, tj@...nel.org, hdegoede@...hat.com,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v9 4/4] console: Make persistent scrollback a boot
 parameter

On Tue, Jan 10, 2017 at 10:28:38PM +0100, Manuel Schölling wrote:
> The impact of the persistent scrollback feature on the code size is
> rather small, so the config option is removed. The feature stays
> disabled by default and can be enabled by using the boot command line
> parameter 'vgacon.scrollback_persistent=1' or by setting
> VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT=y.
> 
> Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
> Suggested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

> +module_param_named(scrollback_persistent, scrollback_persistent, bool, 0000);
> +MODULE_PARM_DESC(scrollback_persistent, "Enable persistent scrollback for all vga consoles");

A command-line knob settable by the end-user is something more persistent
than a config option.  As you're going to extend this code beyond vgacon in
the near future, perhaps it'd be better to have a shared setting for all
console drivers?


Meow!
-- 
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