Re: [PATCH 04/19] include: drm: drm_atomic: Make use of 'new_plane_state'

[Ville Syrjälä]

On Fri, Mar 19, 2021 at 08:24:13AM +0000, Lee Jones wrote:
> In the macro for_each_oldnew_plane_in_state() 'new_plane_state' is provided
> as a container for state->planes[i].new_state, but is not utilised in
> some use-cases, so we fake-use it instead.
> 
> Fixes the following W=1 kernel build warning(s):
> 
>  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function ‘amdgpu_dm_commit_cursors’:
>  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:7649:44: warning: variable ‘new_plane_state’ set but not used [-Wunused-but-set-variable]
> 
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <mripard@xxxxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
>  include/drm/drm_atomic.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
> index ac5a28eff2c86..259e6970dc836 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -871,7 +871,8 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>  			     ((plane) = (__state)->planes[__i].ptr,	\
>  			      (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
>  			      (old_plane_state) = (__state)->planes[__i].old_state,\
> -			      (new_plane_state) = (__state)->planes[__i].new_state, 1))
> +			      (new_plane_state) = (__state)->planes[__i].new_state, \
> +			      (void)(new_plane_state) /* Only to avoid unused-but-set-variable warning */, 1))

In this case you can just switch the code to use
for_each_old_plane_in_state() instead.

>  
>  /**
>   * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic
> -- 
> 2.27.0
> 
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-- 
Ville Syrjälä
Intel