linux-kernel - Re: [PATCH] powerpc: Use shared font data

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Message-ID: <ZMABj6UNK98fONEQ@gallifrey>
Date:   Tue, 25 Jul 2023 17:08:31 +0000
From:   "Dr. David Alan Gilbert" <linux@...blig.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        benh@...nel.crashing.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: Use shared font data

* Sam Ravnborg (sam@...nborg.org) wrote:
> Hi David,
> 
> On Tue, Jul 25, 2023 at 01:01:41AM +0100, linux@...blig.org wrote:
> > From: "Dr. David Alan Gilbert" <linux@...blig.org>
> > 
> > PowerPC has a 'btext' font used for the console which is almost identical
> > to the shared font_sun8x16, so use it rather than duplicating the data.
> > 
> > They were actually identical until about a decade ago when
> >    commit bcfbeecea11c ("drivers: console: font_: Change a glyph from
> >                         "broken bar" to "vertical line"")
> > 
> > which changed the | in the shared font to be a solid
> > bar rather than a broken bar.  That's the only difference.
> > 
> > This was originally spotted by PMD which noticed that sparc does
> > the same thing with the same data, and they also share a bunch
> > of functions to manipulate the data.  I've previously posted a near
> > identical patch for sparc.
> > 
> > One difference I notice in PowerPC is that there are a bunch of compile
> > options for the .c files for the early code to avoid a bunch of security
> > compilation features;  it's not clear to me if this is a problem for
> > this font data.
> > 
> > Tested very lightly with a boot without FS in qemu.
> > 
> > Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> 
> Yep, looks very similar to sparc, so
> 
> Reviewed-by: Sam Ravnborg <sam@...nborg.org>

Thanks!

Dave

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