linux-kernel - Re: fbcon: remove soft scrollback code (missing Doc. patch)

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Date:   Mon, 14 Sep 2020 18:34:25 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Bhaskar Chowdhury <unixbhaskar@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Yuan Ming <yuanmingbuaa@...il.com>, Willy Tarreau <w@....eu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        NopNop Nop <nopitydays@...il.com>,
        张云海 <zhangyunhai@...ocus.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jonathan Corbet <corbet@....net>
Subject: Re: fbcon: remove soft scrollback code (missing Doc. patch)

On 9/14/20 6:28 PM, Bhaskar Chowdhury wrote:
> On 18:18 Mon 14 Sep 2020, Randy Dunlap wrote:
>> HI--
>>
>> On 9/14/20 3:48 PM, Linux Kernel Mailing List wrote:
>>> Commit:     50145474f6ef4a9c19205b173da6264a644c7489
>>> Parent:     856deb866d16e29bd65952e0289066f6078af773
>>> Refname:    refs/heads/master
>>> Web:        https://git.kernel.org/torvalds/c/50145474f6ef4a9c19205b173da6264a644c7489
>>> Author:     Linus Torvalds <torvalds@...ux-foundation.org>
>>> AuthorDate: Mon Sep 7 11:45:27 2020 -0700
>>> Committer:  Linus Torvalds <torvalds@...ux-foundation.org>
>>> CommitDate: Mon Sep 14 10:06:15 2020 -0700
>>>
>>>     fbcon: remove soft scrollback code
>>>         This (and the VGA soft scrollback) turns out to have various nasty small
>>>     special cases that nobody really is willing to fight.  The soft
>>>     scrollback code was really useful a few decades ago when you typically
>>>     used the console interactively as the main way to interact with the
>>>     machine, but that just isn't the case any more.
>>
>> and:
>>
>>> Commit:     973c096f6a85e5b5f2a295126ba6928d9a6afd45
>>> Parent:     06a0df4d1b8b13b551668e47b11fd7629033b7df
>>> Refname:    refs/heads/master
>>> Web:        https://git.kernel.org/torvalds/c/973c096f6a85e5b5f2a295126ba6928d9a6afd45
>>> Author:     Linus Torvalds <torvalds@...ux-foundation.org>
>>> AuthorDate: Wed Sep 9 14:53:50 2020 -0700
>>> Committer:  Linus Torvalds <torvalds@...ux-foundation.org>
>>> CommitDate: Mon Sep 14 10:06:15 2020 -0700
>>>
>>>     vgacon: remove software scrollback support
>>
>>
>>
>> diffstats:
>>
>>> ---
>>>  drivers/video/fbdev/core/fbcon.c | 334 +--------------------------------------
>>>  1 file changed, 4 insertions(+), 330 deletions(-)
>>
>>>  arch/powerpc/configs/pasemi_defconfig |   1 -
>>>  arch/powerpc/configs/ppc6xx_defconfig |   1 -
>>>  arch/x86/configs/i386_defconfig       |   1 -
>>>  arch/x86/configs/x86_64_defconfig     |   1 -
>>>  drivers/video/console/Kconfig         |  46 -------
>>>  drivers/video/console/vgacon.c        | 221 +---------------------------------
>>>  6 files changed, 1 insertion(+), 270 deletions(-)
>>
>>
>>
>>
>> Now someone can remove the documentation for scrollback (and "no-scroll")...
>>
>>
> If you wont mind ...let me stab at it ...

Sure, go for it.  Thanks.

> 
> Documentation/admin-guide/kernel-parameters.txt:        no-scroll       [VGA] Disables scrollback.
> Documentation/fb/fbcon.rst:2. fbcon=scrollback:<value>[k]
> Documentation/fb/fbcon.rst:     The scrollback buffer is memory that is used to preserve display
> Documentation/fb/matroxfb.rst:   with 'video=scrollback:0'.
> Documentation/fb/sstfb.rst:  disable software scrollback, as it can oops badly ...
> Documentation/fb/vesafb.rst:            * You'll get scrollback (the Shift-PgUp thing),
> Documentation/fb/vesafb.rst:              the video memory can be used as scrollback buffer


-- 
~Randy