linux-kernel - Re: [PATCH v2] drm/vram-helper: fix kernel-doc warnings

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Date: Mon, 8 Jan 2024 13:10:12 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Thomas Zimmermann <tzimmermann@...e.de>, linux-kernel@...r.kernel.org
Cc: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 dri-devel@...ts.freedesktop.org,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH v2] drm/vram-helper: fix kernel-doc warnings

Hi Thomas,

On 1/8/24 00:57, Thomas Zimmermann wrote:
> Hi,
> 
> thanks for the fix.
> 
> Am 06.01.24 um 04:29 schrieb Randy Dunlap:
>> Remove the @funcs entry from struct drm_vram_mm to quieten the kernel-doc
>> warning.
>>
>> Use the "define" kernel-doc keyword and an '\' line continuation
>> to fix another kernel-doc warning.
>>
>> drm_gem_vram_helper.h:129: warning: missing initial short description on line:
>>   * DRM_GEM_VRAM_PLANE_HELPER_FUNCS -
>> drm_gem_vram_helper.h:185: warning: Excess struct member 'funcs' description in 'drm_vram_mm'
>>
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: David Airlie <airlied@...il.com>
>> Cc: Daniel Vetter <daniel@...ll.ch>
>> Cc: dri-devel@...ts.freedesktop.org
>> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
>> Cc: Maxime Ripard <mripard@...nel.org>
>> Cc: Thomas Zimmermann <tzimmermann@...e.de>
>> ---
>> v2: Add commit description
>>
>> base-commit: 610a9b8f49fbcf1100716370d3b5f6f884a2835a
>>
>>   include/drm/drm_gem_vram_helper.h |    3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff -- a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h
>> --- a/include/drm/drm_gem_vram_helper.h
>> +++ b/include/drm/drm_gem_vram_helper.h
>> @@ -126,7 +126,7 @@ drm_gem_vram_plane_helper_cleanup_fb(str
>>                        struct drm_plane_state *old_state);
>>     /**
>> - * DRM_GEM_VRAM_PLANE_HELPER_FUNCS -
>> + * define DRM_GEM_VRAM_PLANE_HELPER_FUNCS - \
> 
> Did something change wrt. doc syntax? I think this used to work without warnings. About this 'define': we don't use is in another docs. Can we leave it out here or is this the new syntax?
> 

There are no doc syntax changes that I know of. This is not
new syntax. It has been around since 2014:
  cbb4d3e6510b ("scripts/kernel-doc: handle object-like macros")


"define OBJ_LIKE_MACRO" is used 2 other times in include/drm/:

drm_fb_helper.h:

/**
 * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers
 *
 * Helper define to register default implementations of drm_fb_helper
 * functions. To be used in struct fb_ops of drm drivers.
 */

drm_gem_vram_helper.h: (the file being patched here)

/**
 * define DRM_GEM_VRAM_DRIVER - default callback functions for \
	&struct drm_driver
 *
 * Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
 * &struct drm_driver with default functions.
 */


> 
>>    *    Initializes struct drm_plane_helper_funcs for VRAM handling
>>    *
>>    * Drivers may use GEM BOs as VRAM helpers for the framebuffer memory. This
>> @@ -170,7 +170,6 @@ void drm_gem_vram_simple_display_pipe_cl
>>    * @vram_base:    Base address of the managed video memory
>>    * @vram_size:    Size of the managed video memory in bytes
>>    * @bdev:    The TTM BO device.
>> - * @funcs:    TTM BO functions
>>    *
>>    * The fields &struct drm_vram_mm.vram_base and
>>    * &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
> 

-- 
#Randy