linux-kernel - [PATCH 20/40] include: drm: drm_atomic: Make use of 'new_plane

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Date:   Fri,  8 Jan 2021 20:14:37 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 20/40] include: drm: drm_atomic: Make use of 'new_plane_state'

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@...ux.intel.com>
Cc: Maxime Ripard <mripard@...nel.org>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Rob Clark <robdclark@...il.com>
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 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 54e051a957dfc..866daba4c4a55 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -847,7 +847,8 @@ 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))
 
 /**
  * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic
-- 
2.25.1