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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: 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>,
	张云海 <zhangyunhai@nsfocus.com>,
	"Andy Lutomirski" <luto@amacapital.net>
Subject: Re: fbcon: remove soft scrollback code (missing Doc. patch)
Date: Mon, 14 Sep 2020 18:28:34 -0700	[thread overview]
Message-ID: <CAHk-=wiNTWpqUF0HgzoyPGEaaAjxD-Bor+EE3DbJ52S30cfCWg@mail.gmail.com> (raw)
In-Reply-To: <c9cd22ec-60dc-d761-b488-d3a1392708c0@infradead.org>

On Mon, Sep 14, 2020 at 6:19 PM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> Now someone can remove the documentation for scrollback (and "no-scroll")...

Note that scrollback hasn't actually gone away entirely - the original
scrollback supported by _hardware_ still exists.

Of course, that's really just the old-fashioned text VGA console, but
that one actually scrolls not by moving any bytes around, but by
moving the screen start address. And the scrollback similarly isn't
about any software buffering, but about the ability of moving back
that screen start address.

Do people use that? Probably not. But it wasn't removed because it
didn't have any of the complexities and bitrot that all the software
buffering code had.

That said, I didn't check how much of the documentation is for the VGA
text console, and how much of it is for the actual software scrollback
for fbcon etc. So it is entirely possible that all the docs are about
the removed parts.

              Linus

  parent reply	other threads:[~2020-09-15  1:29 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <git-mailbomb-linux-master-50145474f6ef4a9c19205b173da6264a644c7489@kernel.org>
2020-09-15  1:18 ` fbcon: remove soft scrollback code (missing Doc. patch) Randy Dunlap
2020-09-15  1:28   ` Bhaskar Chowdhury
2020-09-15  1:30     ` Linus Torvalds
2020-09-15  1:34     ` Randy Dunlap
2020-09-15  1:28   ` Linus Torvalds [this message]
2020-09-16 20:54     ` Pavel Machek
2020-09-18 10:27       ` Adam Borowski
2020-09-30 21:29         ` Maciej W. Rozycki
2021-01-08 19:01       ` Phillip Susi
2021-01-08 23:11         ` Linus Torvalds
2021-01-12 15:00           ` Phillip Susi
2021-01-12 16:11             ` Greg Kroah-Hartman
2021-01-12 15:57           ` Daniel Vetter
2021-01-14 15:56             ` Geert Uytterhoeven
2021-01-14 16:11               ` Daniel Vetter
2021-01-15  8:06                 ` Geert Uytterhoeven
2021-02-03  8:03                   ` Thomas Zimmermann
2021-01-22 18:55               ` Phillip Susi
2021-01-25 15:39                 ` Geert Uytterhoeven
2021-02-02 14:18                 ` Daniel Vetter
2021-02-02 15:13                   ` Phillip Susi
2021-02-02 15:23                     ` Daniel Vetter
2021-01-14 17:43           ` fbcon: remove soft scrollback code Alan Mackenzie

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