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Date:   Tue, 15 Sep 2020 06:58:00 +0530
From:   Bhaskar Chowdhury <unixbhaskar@gmail.com>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Yuan Ming <yuanmingbuaa@gmail.com>, Willy Tarreau <w@1wt.eu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        NopNop Nop <nopitydays@gmail.com>,
        =?utf-8?B?5byg5LqR5rW3?= <zhangyunhai@nsfocus.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Jonathan Corbet <corbet@lwn.net>
Subject: Re: fbcon: remove soft scrollback code (missing Doc. patch)
Message-ID: <20200915012800.GA17809@Gentoo>
Mail-Followup-To: Bhaskar Chowdhury <unixbhaskar@gmail.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Daniel Vetter <daniel@ffwll.ch>, Yuan Ming <yuanmingbuaa@gmail.com>,
        Willy Tarreau <w@1wt.eu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        NopNop Nop <nopitydays@gmail.com>,
        =?utf-8?B?5byg5LqR5rW3?= <zhangyunhai@nsfocus.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Jonathan Corbet <corbet@lwn.net>
References: <git-mailbomb-linux-master-50145474f6ef4a9c19205b173da6264a644c7489@kernel.org>
 <c9cd22ec-60dc-d761-b488-d3a1392708c0@infradead.org>
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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/50145474f6ef4a9c19205b173d=
a6264a644c7489
>> Author:     Linus Torvalds <torvalds@linux-foundation.org>
>> AuthorDate: Mon Sep 7 11:45:27 2020 -0700
>> Committer:  Linus Torvalds <torvalds@linux-foundation.org>
>> CommitDate: Mon Sep 14 10:06:15 2020 -0700
>>=20
>>     fbcon: remove soft scrollback code
>>    =20
>>     This (and the VGA soft scrollback) turns out to have various nasty s=
mall
>>     special cases that nobody really is willing to fight.  The soft
>>     scrollback code was really useful a few decades ago when you typical=
ly
>>     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/973c096f6a85e5b5f2a295126b=
a6928d9a6afd45
>> Author:     Linus Torvalds <torvalds@linux-foundation.org>
>> AuthorDate: Wed Sep 9 14:53:50 2020 -0700
>> Committer:  Linus Torvalds <torvalds@linux-foundation.org>
>> CommitDate: Mon Sep 14 10:06:15 2020 -0700
>>=20
>>     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").=
=2E.
>
>
If you wont mind ...let me stab at it ...

Documentation/admin-guide/kernel-parameters.txt:        no-scroll       [VG=
A] Disables scrollback.
Documentation/fb/fbcon.rst:2. fbcon=3Dscrollback:<value>[k]
Documentation/fb/fbcon.rst:     The scrollback buffer is memory that is use=
d to preserve display
Documentation/fb/matroxfb.rst:   with 'video=3Dscrollback:0'.
Documentation/fb/sstfb.rst:  disable software scrollback, as it can oops ba=
dly ...
Documentation/fb/vesafb.rst:            * You'll get scrollback (the Shift-=
PgUp thing),
Documentation/fb/vesafb.rst:              the video memory can be used as s=
crollback buffer


~Bhaskar
>--=20
>~Randy
>

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