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Subject: Re: fbcon: remove soft scrollback code (missing Doc. patch)
To:     Bhaskar Chowdhury <unixbhaskar@gmail.com>,
        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>
 <20200915012800.GA17809@Gentoo>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <ada6aecf-b98e-5249-5e68-7a4eaa947ce3@infradead.org>
Date:   Mon, 14 Sep 2020 18:34:25 -0700
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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@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
>>>
>>> ??? 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@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
>>>
>>> ??? 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