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drm/todo: Add idr_init_base todo 

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180219145708.23523-1-daniel.vetter@ffwll.ch
hifive-unleashed-5.1
Daniel Vetter 2018-02-19 15:57:08 +01:00
parent e86584c537
commit 1aecabb5b2
1 changed files with 10 additions and 0 deletions
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Documentation/gpu/todo.rst
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@ -212,6 +212,16 @@ probably use drm_fb_helper_fbdev_teardown().
Contact: Maintainer of the driver you plan to convert
idr_init_base()
---------------
DRM core&drivers uses a lot of idr (integer lookup directories) for mapping
userspace IDs to internal objects, and in most places ID=0 means NULL and hence
is never used. Switching to idr_init_base() for these would make the idr more
efficient.
Contact: Daniel Vetter
Core refactorings
=================