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DRM uses a magic number of 4 for the maximum number of planes per color format. Declare this constant via DRM_FORMAT_MAX_PLANES and update the related code. Some code depends on the length of arrays that are now declared with DRM_FORMAT_MAX_PLANES. Convert it from '4' to ARRAY_SIZE. v2: * mention usage of ARRAY_SIZE() in the commit message (Maxime) * also fix error handling in drm_gem_fb_init_with_funcs() (kernel test robot) * include <drm/drm_fourcc.h> for DRM_FORMAT_MAX_PLANES Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210730183511.20080-2-tzimmermann@suse.de
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.