linux-kernel - Re: [PATCH 3/3] drm/gem-vram: revert the 8-byte alignment constraint

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Message-ID: <4bdbbbd8-3777-444d-bb49-c79c3137abf5@suse.de>
Date: Tue, 2 Dec 2025 18:09:45 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Ludovic Desroches <ludovic.desroches@...rochip.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] drm/gem-vram: revert the 8-byte alignment constraint

Hi

Am 26.11.25 um 15:44 schrieb Ludovic Desroches:
> Using drm_mode_size_dumb() to compute the size of dumb buffers introduced
> an 8-byte alignment constraint on the pitch that wasn’t present before.
> Let’s remove this constraint, which isn’t necessarily required and may
> cause buffers to be allocated larger than needed.
>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> ---
>   drivers/gpu/drm/drm_gem_vram_helper.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> index f40f6e167f126681201b13d60be9c508f25d481f..3ab91965ec6f8fa275b9556079dfb335a02664bb 100644
> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> @@ -553,7 +553,7 @@ int drm_gem_vram_driver_dumb_create(struct drm_file *file,
>   	if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
>   		return -EINVAL;
>   
> -	ret = drm_mode_size_dumb(dev, args, SZ_8, 0);
> +	ret = drm_mode_size_dumb(dev, args, 0, 0);
>   	if (ret)
>   		return ret;

This code has not been merged yet AFAICT. I'll add the fix to the 
patch's next update.

Best regards
Thomas

>   
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)