linux-kernel - Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign endianness

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0802171030330.6848@anakin>
Date:	Sun, 17 Feb 2008 10:44:32 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	avorontsov@...mvista.com, linux-fbdev-devel@...ts.sourceforge.net
cc:	Andrew Morton <akpm@...ux-foundation.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, adaplas@...il.com
Subject: Re: [Linux-fbdev-devel] [PATCH 1/2] fb: add support for foreign
 endianness

On Fri, 15 Feb 2008, Anton Vorontsov wrote:
> On Thu, Feb 14, 2008 at 10:49:42PM -0800, Andrew Morton wrote:
> > On Tue, 5 Feb 2008 18:44:32 +0300 Anton Vorontsov <avorontsov@...mvista.com> wrote:
> > > This patch adds support for the framebuffers with non-native
> > > endianness. This is done via FBINFO_FOREIGN_ENDIAN flag that will
> > > be used by the drivers. Depending on the host endianness this flag
> > > will be overwritten by FBINFO_BE_MATH internal flag, or cleared.
> > > 
> > > Tested to work on MPC8360E-RDK (BE) + Fujitsu MINT framebuffer (LE).
> > 
> > That's a pretty large patch to fbdev core,
> 
> Yes, but changes are mostly trivial. No insurance of typos and thinkos
> though. OTOH, it survived my tests.
> 
> > and Tony appears to have gone
> > offline again and you didn't cc the fbdev mailing list.
> 
> FRAMEBUFFER LAYER
> P:      Antonino Daplas
> M:      adaplas@...il.com
> L:      linux-fbdev-devel@...ts.sourceforge.net (subscribers-only)
> 
> I'm lazy to subscribe on occasional patches. Yup, this is hardly
> an excuse...

While linux-fbdev is subscribers-only, non-subscribers are not plainly
rejected, but moderated, so the casual patch/comment/question comes
through.

I'll cook up a patch for MAINTAINERS to clarify.

> > Actually...  should CONFIG_FB_FOREIGN_ENDIAN exist, or should this feature
> > be permanently enabled?
> 
> It should not. Because with CONFIG_FB_FOREIGN_ENDIAN enabled, drawing
> might be a little bit slower, because of external checks for endianness
> (I didn't noticed any slowdown, but I guess it's still measurable if we
> find some fb benchmark).

> > I'd like to at least queue a patch in -mm so that CONFIG_FB_FOREIGN_ENDIAN
> > is forced-on, so the code gets some runtime testing.  Will that break
> > anything?
> 
> Nope, it should not break anything, just possible fbconsole/tux drawing
> slowdown.

Tux drawing speed doesn't really matter, as it's done once only.
Console text drawing is different.

`time cat MAINTAINERS' is a good test. Of course, is most time is spent
in scrolling, you won't see much difference.

So probably we need a test file that contains lines of text interspersed
with `HOME' escape sequences, so we don't scroll?

> Thinking about it a little bit more, I believe we want to add a choice,
> which exactly foreign endianness we want to compile-in. Then, if we're
> pretty confident that particular BE machine uses only LE framebuffer,
> gcc can optimize away endianness checks.
> 
> Patch on top of previous inlined here. With that patch, slowdown is
> possible with CONFIG_FB_BOTH_ENDIAN option only, which is still
> default if FOREIGN_ENDIAN is selected.
> With this patch FB_FOREIGN_ENDIAN converted to menuconfig with the
> choice inside: which type of foreign endianness we want to compile-in.
> 

The notion of `FOREIGN_ENDIAN' is relative, as it depends on the
architecture you're compiling for.

Suppose you have a PCI graphics card with a frame buffer that's always
big endian. When compiling for a big endian platform, the driver won't
depend on FB_FOREIGN_ENDIAN. When compiling for a little endian
platform, it will.

Shouldn't we add LITTLE_ENDIAN and BIG_ENDIAN Kconfig vars first, just
like we have 64BIT?

> As a bonus, now fb subsystem will refuse to register framebuffer with
> unsupported endianness, and will suggest a way to solve the problem.

I'd like to handle this in Kconfig (cfr. above).

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/