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Slight refactor to make call sites less annoying.
Now takes a (setting_desc_t *) instead of the members as discrete
parameters, and returns an errno on error so callers can simply
propagate error codes out rather than having to get access to errno
defines, check for NULL and return -ENOMEM etc.
It also makes the call sites self documenting by employing designated
initializers in compound literals for the supplied setting_desc_t.
This is in prep for runtime-configurable module settings.
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The fb_ops entrypoints and their descendants are purely readers
of the settings, so constify their settings_t instances and the
operative functions which only read settings.
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This should probably be split into multiple commits, but
for simplicity sake it's all cut over at once.
drm_fb.c sees major changes, migrating the remaining drm-specific bits
from drmsetup into it, behind the settings API.
rototiller.c sees a bunch of scaffolding surrounding the settings API
and wiring it up into the commandline handling and renderers and video
backends.
fb.[ch] see minor changes as settings get plumbed to the backend
drmsetup.[ch] goes bye bye
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Largely mechanical copying of the drm code into the new fb_ops_t
abstraction. Dormant for now.
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