[PATCH 0/4] ppc, fbdev: Clean up fbdev mmap helper

Thomas Zimmermann tzimmermann at suse.de
Tue Sep 5 22:44:08 AEST 2023


Am 05.09.23 um 04:47 schrieb Michael Ellerman:
> Thomas Zimmermann <tzimmermann at suse.de> writes:
>> Refactor fb_pgprotect() in PowerPC to work without struct file. Then
>> clean up and rename fb_pgprotect(). This change has been discussed at
>> [1] in the context of refactoring fbdev's mmap code.
>> The first three patches adapt PowerPC's internal interfaces to
>> provide a phys_mem_access_prot() that works without struct file. Neither
>> the architecture code or fbdev helpers need the parameter.
>> Patch 4 replaces fbdev's fb_pgprotect() with fb_pgprot_device() on
>> all architectures. The new helper with its stream-lined interface
>> enables more refactoring within fbdev's mmap implementation.
> The content of this series is OK, but the way it's structured makes it a
> real headache to merge, because it's mostly powerpc changes and then a
> dependant cross architecture patch at the end.
> It would be simpler if patch 4 was first and just passed file=NULL to
> the powerpc helper, with an explanation that it's unused and will be
> dropped in a future cleanup.
> We could then put the first patch (previously patch 4) in a topic branch
> that is shared between the powerpc tree and the fbdev tree, and then the
> powerpc changes could be staged on top of that through the powerpc tree.

Ok, thanks for reviewing. The fbdev patch would go through the drm-misc 
tree as base for further refactoring.

I'll update the patchset accordingly.

Best regards

> cheers

Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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