linux-kernel - Re: [PATCH 08/13] drm: remove drm_fb_helper

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Date:   Thu, 21 Jan 2021 09:25:40 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Christoph Hellwig <hch@....de>
Cc:     Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>, Jessica Yu <jeyu@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        live-patching@...r.kernel.org,
        linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 08/13] drm: remove drm_fb_helper_modinit

On Thu, Jan 21, 2021 at 8:55 AM Christoph Hellwig <hch@....de> wrote:
>
> drm_fb_helper_modinit has a lot of boilerplate for what is not very
> simple functionality.  Just open code it in the only caller using
> IS_ENABLED and IS_MODULE.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

I didn't spot any dependencies with your series, should I just merge
this through drm trees? Or do you want an ack?
-Daniel

> ---
>  drivers/gpu/drm/drm_crtc_helper_internal.h | 10 ---------
>  drivers/gpu/drm/drm_fb_helper.c            | 16 -------------
>  drivers/gpu/drm/drm_kms_helper_common.c    | 26 +++++++++++-----------
>  3 files changed, 13 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper_internal.h b/drivers/gpu/drm/drm_crtc_helper_internal.h
> index 25ce42e799952c..61e09f8a8d0ff0 100644
> --- a/drivers/gpu/drm/drm_crtc_helper_internal.h
> +++ b/drivers/gpu/drm/drm_crtc_helper_internal.h
> @@ -32,16 +32,6 @@
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_modes.h>
>
> -/* drm_fb_helper.c */
> -#ifdef CONFIG_DRM_FBDEV_EMULATION
> -int drm_fb_helper_modinit(void);
> -#else
> -static inline int drm_fb_helper_modinit(void)
> -{
> -       return 0;
> -}
> -#endif
> -
>  /* drm_dp_aux_dev.c */
>  #ifdef CONFIG_DRM_DP_AUX_CHARDEV
>  int drm_dp_aux_dev_init(void);
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index ce6d63ca75c32a..0b9f1ae1b7864c 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2499,19 +2499,3 @@ void drm_fbdev_generic_setup(struct drm_device *dev,
>         drm_client_register(&fb_helper->client);
>  }
>  EXPORT_SYMBOL(drm_fbdev_generic_setup);
> -
> -/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
> - * but the module doesn't depend on any fb console symbols.  At least
> - * attempt to load fbcon to avoid leaving the system without a usable console.
> - */
> -int __init drm_fb_helper_modinit(void)
> -{
> -#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
> -       const char name[] = "fbcon";
> -
> -       if (!module_loaded(name))
> -               request_module_nowait(name);
> -#endif
> -       return 0;
> -}
> -EXPORT_SYMBOL(drm_fb_helper_modinit);
> diff --git a/drivers/gpu/drm/drm_kms_helper_common.c b/drivers/gpu/drm/drm_kms_helper_common.c
> index 221a8528c9937a..b694a7da632eae 100644
> --- a/drivers/gpu/drm/drm_kms_helper_common.c
> +++ b/drivers/gpu/drm/drm_kms_helper_common.c
> @@ -64,19 +64,19 @@ MODULE_PARM_DESC(edid_firmware,
>
>  static int __init drm_kms_helper_init(void)
>  {
> -       int ret;
> -
> -       /* Call init functions from specific kms helpers here */
> -       ret = drm_fb_helper_modinit();
> -       if (ret < 0)
> -               goto out;
> -
> -       ret = drm_dp_aux_dev_init();
> -       if (ret < 0)
> -               goto out;
> -
> -out:
> -       return ret;
> +       /*
> +        * The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
> +        * but the module doesn't depend on any fb console symbols.  At least
> +        * attempt to load fbcon to avoid leaving the system without a usable
> +        * console.
> +        */
> +       if (IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION) &&
> +           IS_MODULE(CONFIG_FRAMEBUFFER_CONSOLE) &&
> +           !IS_ENABLED(CONFIG_EXPERT) &&
> +           !module_loaded("fbcon"))
> +               request_module_nowait("fbcon");
> +
> +       return drm_dp_aux_dev_init();
>  }
>
>  static void __exit drm_kms_helper_exit(void)
> --
> 2.29.2
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch