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doc-guide: kernel-doc: tell about object-like macros

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Since 2014 kernel-doc has supported describing object-like macros
but it is not documented anywhere. I should have required some
documentation for it when I merged the patch. :(

There are currently only 3 uses of this (all in DRM headers, in
include/drm/*.h).

Add object-like macro kernel-doc documentation now so that more may
know about it and use it.

Fixes: cbb4d3e651 ("scripts/kernel-doc: handle object-like macros")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240107012400.32587-1-rdunlap@infradead.org
This commit is contained in:
Randy Dunlap 2024-01-06 17:24:00 -08:00 committed by Jonathan Corbet
parent d2a70e28ef
commit 91a3d6be99
1 changed files with 45 additions and 0 deletions
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45
Documentation/doc-guide/kernel-doc.rst
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@ -341,6 +341,51 @@ Typedefs with function prototypes can also be documented::
*/
typedef void (*type_name)(struct v4l2_ctrl *arg1, void *arg2);
Object-like macro documentation
-------------------------------
Object-like macros are distinct from function-like macros. They are
differentiated by whether the macro name is immediately followed by a
left parenthesis ('(') for function-like macros or not followed by one
for object-like macros.
Function-like macros are handled like functions by ``scripts/kernel-doc``.
They may have a parameter list. Object-like macros have do not have a
parameter list.
The general format of an object-like macro kernel-doc comment is::
/**
* define object_name - Brief description.
*
* Description of the object.
*/
Example::
/**
* define MAX_ERRNO - maximum errno value that is supported
*
* Kernel pointers have redundant information, so we can use a
* scheme where we can return either an error code or a normal
* pointer with the same return value.
*/
#define MAX_ERRNO 4095
Example::
/**
* define DRM_GEM_VRAM_PLANE_HELPER_FUNCS - \
* Initializes struct drm_plane_helper_funcs for VRAM handling
*
* This macro initializes struct drm_plane_helper_funcs to use the
* respective helper functions.
*/
#define DRM_GEM_VRAM_PLANE_HELPER_FUNCS \
.prepare_fb = drm_gem_vram_plane_helper_prepare_fb, \
.cleanup_fb = drm_gem_vram_plane_helper_cleanup_fb
Highlights and cross-references
-------------------------------