linux-kernel - [PATCH v10 4/6] drm/atomic: Avoid unused-but-set-variable warning on for_each_old_plane_in

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Date:   Thu,  7 Apr 2022 17:11:54 +0800
From:   Liu Ying <victor.liu@....com>
To:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     p.zabel@...gutronix.de, airlied@...ux.ie, daniel@...ll.ch,
        robh+dt@...nel.org, krzk+dt@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, guido.gunther@...i.sm,
        marcel.ziswiler@...adex.com, laurentiu.palcu@....nxp.com,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH v10 4/6] drm/atomic: Avoid unused-but-set-variable warning on for_each_old_plane_in_state

Artificially use 'plane' and 'old_plane_state' to avoid 'not used' warning.
The precedent has already been set by other macros in the same file.

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Liu Ying <victor.liu@....com>
---
v9->v10:
* No change.

v8->v9:
* No change.

v7->v8:
* No change.

v6->v7:
* No change.

v5->v6:
* Fix commit message typo - s/Artifically/Artificially/

v4->v5:
* No change.

v3->v4:
* Add Daniel's A-b tag.

v2->v3:
* Add a missing blank line.

v1->v2:
* No change.

 include/drm/drm_atomic.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 1701c2128a5c..50377c80a039 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -928,7 +928,10 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 	     (__i)++)							\
 		for_each_if ((__state)->planes[__i].ptr &&		\
 			     ((plane) = (__state)->planes[__i].ptr,	\
-			      (old_plane_state) = (__state)->planes[__i].old_state, 1))
+			      (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
+			      (old_plane_state) = (__state)->planes[__i].old_state, \
+			      (void)(old_plane_state) /* Only to avoid unused-but-set-variable warning */, 1))
+
 /**
  * for_each_new_plane_in_state - iterate over all planes in an atomic update
  * @__state: &struct drm_atomic_state pointer
-- 
2.25.1