linux-kernel - Re: [PATCH 03/29] drm/atomic: Fix unused but set warning in for_each_old_private_obj_in

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Message-ID: <c76f914e-13ed-463f-be94-1a5c3d031986@suse.de>
Date: Tue, 2 Sep 2025 15:10:47 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Maxime Ripard <mripard@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Jyri Sarha <jyri.sarha@....fi>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Devarsh Thakkar <devarsht@...com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/29] drm/atomic: Fix unused but set warning in
 for_each_old_private_obj_in_state



Am 02.09.25 um 10:32 schrieb Maxime Ripard:
> The for_each_old_private_obj_in_state() macro triggers a compiler
> warning if the obj parameter passed to it isn't used in the code block.
>
> Add a similar workaround than in most other macros.
>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   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 689a29bdeb4a06672ab6fffecb513d58ff6e07f9..f13f926d21047e42bb9ac692c2dd4b88f2ebd91c 100644
> --- a/include/drm/drm_atomic.h
> +++ b/include/drm/drm_atomic.h
> @@ -1112,10 +1112,11 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
>    */
>   #define for_each_old_private_obj_in_state(__state, obj, old_obj_state, __i) \
>   	for ((__i) = 0; \
>   	     (__i) < (__state)->num_private_objs && \
>   		     ((obj) = (__state)->private_objs[__i].ptr, \
> +		      (void)(obj) /* Only to avoid unused-but-set-variable warning */, \
>   		      (old_obj_state) = (__state)->private_objs[__i].old_state, 1); \
>   	     (__i)++)
>   
>   /**
>    * for_each_new_private_obj_in_state - iterate over all private objects in an atomic update
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)