linux-kernel - [PATCH 02/30] include: drm: drm_atomic: Artificially use 'crtc' to avoid 'not used' warning

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Date:   Thu, 12 Nov 2020 19:00:11 +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 02/30] include: drm: drm_atomic: Artificially use 'crtc' to avoid 'not used' warning

The precedent has already been set by other macros in the same file.

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/vkms/vkms_drv.c:55:19: warning: variable ‘crtc’ set but not used [-Wunused-but-set-variable]
 55 | struct drm_crtc *crtc;
 | ^~~~

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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 413fd0ca56a8f..dc5e0fbecc04e 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -802,6 +802,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 	     (__i)++)							\
 		for_each_if ((__state)->crtcs[__i].ptr &&		\
 			     ((crtc) = (__state)->crtcs[__i].ptr,	\
+			     (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
 			     (old_crtc_state) = (__state)->crtcs[__i].old_state, 1))
 
 /**
-- 
2.25.1