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Date: Sat, 29 Aug 2026 13:33:59 +0000
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>, Simona Vetter <simona@ffwll.ch>,
  linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
  Helge Deller <deller@gmx.de>, Thomas Zimmermann <tzimmermann@suse.de>,
  linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [Patch 3/9]: Replace scr_readw/writew by scr_readg/writeg, etc
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 <2026082934-irrigate-tastiness-c4ff@gregkh>
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From: Alan Mackenzie <acm@muc.de>
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On Sat, Aug 29, 2026 at 14:11:00 +0200, Greg Kroah-Hartman wrote:
> On Thu, Aug 27, 2026 at 06:47:05PM +0000, Alan Mackenzie wrote:

> > vt: 32b glyph: 3. replace scr_readw/writew by scr_readg/writeg, etc.

> I don't understand these lines in your patches, where are they from and
> what are they for?

scr_readg and scr_writeg read and write an entire glyph, regardless of
whether that glyph is 16-bit or 32-bit.  The latter is determined by the
setting of CONFIG_FB_GLYPH_21BIT.

This is the main complication in these patches; having to cope with both
sizes of glyph, for backward compatibility, rather than just switching
to 32-bit glyphs.

> thanks,

> greg k-h

-- 
Alan Mackenzie (Nuremberg, Germany).