linux-kernel - Re: [PATCH] drm/fbdev: fix drm_fb_helper_deferred

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Message-ID: <0bbc250b-fe6a-4e8e-927b-35bd47475d69@suse.de>
Date: Mon, 21 Oct 2024 09:18:46 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Jonathan Cavitt <jonathan.cavitt@...el.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/fbdev: fix drm_fb_helper_deferred_io() build failure

Hi

Am 18.10.24 um 22:35 schrieb Dmitry Baryshkov:
> The drm_fb_helper_deferred_io() uses struct fb_deferred_io_pageref,
> which isn't available without CONFIG_FB_DEFERRED_IO. Put the function
> under corresponding #ifdef to fix build failure if deferred I/O isn't
> enabled.
>
> Fixes: 8058944f5226 ("drm/fbdev: Select fbdev I/O helpers from modules that require them")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/drm_fb_helper.c | 2 ++

Thanks for this fix. The combination of all these fbdev options is a bit 
of headache. Could you please also protect the function's declaration? [1]

[1] 
https://elixir.bootlin.com/linux/v6.11/source/include/drm/drm_fb_helper.h#L259

Best regards
Thomas

>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index d5e8994345bb..c9008113111b 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -697,6 +697,7 @@ void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u3
>   }
>   EXPORT_SYMBOL(drm_fb_helper_damage_area);
>   
> +#ifdef CONFIG_FB_DEFERRED_IO
>   /**
>    * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
>    * @info: fb_info struct pointer
> @@ -740,6 +741,7 @@ void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagerefli
>   	}
>   }
>   EXPORT_SYMBOL(drm_fb_helper_deferred_io);
> +#endif
>   
>   /**
>    * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
>
> ---
> base-commit: 2063ca42486bc07b49bc145b5dfcb421f4deebaf
> change-id: 20241018-fix-drm-deferred-01c9996c17a6
>
> Best regards,

-- 
--
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)