From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sam Ravnborg Date: Fri, 17 Apr 2020 16:50:41 +0000 Subject: Re: [PATCH 6/8] drm: decouple from CONFIG_FB Message-Id: <20200417165041.GA30483@ravnborg.org> List-Id: References: <20200417155553.675905-1-arnd@arndb.de> <20200417155553.675905-7-arnd@arndb.de> In-Reply-To: <20200417155553.675905-7-arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Arnd Bergmann Cc: marex@denx.de, linux-renesas-soc@vger.kernel.org, linux-fbdev@vger.kernel.org, dsd@laptop.org, Nicolas Pitre , airlied@linux.ie, masahiroy@kernel.org, jfrederich@gmail.com, Saeed Mahameed , thellstrom@vmware.com, haojian.zhuang@gmail.com, Andrzej Hajda , kieran.bingham+renesas@ideasonboard.com, geert@linux-m68k.org, dri-devel@lists.freedesktop.org, linux-graphics-maintainer@vmware.com, robert.jarzmik@free.fr, Jason Gunthorpe , daniel@zonque.org, Laurent.pinchart@ideasonboard.com Hi Arnd. On Fri, Apr 17, 2020 at 05:55:51PM +0200, Arnd Bergmann wrote: > CONFIG_DRM_KMS_FB_HELPER selects CONFIG_FB, which is something it > really should not, to avoid circular dependencies and accidentally > including potentially dangerous user interfaces in the kernel, > so change this into a 'depends on' check. > > Two device drivers currently select CONFIG_DRM_KMS_FB_HELPER, but > as far as I can tell, they do not really need to any more, so those > selects can be removed. > > This leaves DRM_FBDEV_EMULATION as the only thing that rightfully > selects CONFIG_DRM_KMS_FB_HELPER, and this now has to depend on > CONFIG_FB and its dependencies. > > Signed-off-by: Arnd Bergmann > --- > drivers/gpu/drm/Kconfig | 5 +++-- > drivers/gpu/drm/mxsfb/Kconfig | 1 - > drivers/gpu/drm/zte/Kconfig | 1 - > 3 files changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 43594978958e..7c3109133685 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -80,7 +80,7 @@ config DRM_KMS_HELPER > config DRM_KMS_FB_HELPER > bool > depends on DRM_KMS_HELPER > - select FB > + depends on FB > select FRAMEBUFFER_CONSOLE if !EXPERT > select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE > select FB_SYS_FOPS > @@ -111,7 +111,8 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS > > config DRM_FBDEV_EMULATION > bool "Enable legacy fbdev support for your modesetting driver" > - depends on DRM > + depends on DRM && FB > + depends on FB=y || DRM=m > select DRM_KMS_HELPER > select DRM_KMS_FB_HELPER > default y This statement: depends on DRM && FB tell us that both symbols must be either y or m. Any combination of y and m will do the trick Then we have this statement: depends on FB=y || DRM=m It tells us that either FB equals y or DRM equals m. So we have following table FB DRM Result n n n n y n n m n y n n y y y y m y m n n m y N m m y So what this try to say is that we cannot have FB a module while DRM is built-in (marked N in the above). Could you explain in the changelog why this combination is not good. (Or tell me if my analysis was flawed). With this fixed (assuming I am right): Reviewed-by: Sam Ravnborg Sam > diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig > index 0dca8f27169e..33916b7b2c50 100644 > --- a/drivers/gpu/drm/mxsfb/Kconfig > +++ b/drivers/gpu/drm/mxsfb/Kconfig > @@ -10,7 +10,6 @@ config DRM_MXSFB > depends on COMMON_CLK > select DRM_MXS > select DRM_KMS_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_CMA_HELPER > select DRM_PANEL > help > diff --git a/drivers/gpu/drm/zte/Kconfig b/drivers/gpu/drm/zte/Kconfig > index 90ebaedc11fd..aa8594190b50 100644 > --- a/drivers/gpu/drm/zte/Kconfig > +++ b/drivers/gpu/drm/zte/Kconfig > @@ -3,7 +3,6 @@ config DRM_ZTE > tristate "DRM Support for ZTE SoCs" > depends on DRM && ARCH_ZX > select DRM_KMS_CMA_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_HELPER > select SND_SOC_HDMI_CODEC if SND_SOC > select VIDEOMODE_HELPERS > -- > 2.26.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD7D0C2D0EF for ; Fri, 17 Apr 2020 16:50:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0A8D22202 for ; Fri, 17 Apr 2020 16:50:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726644AbgDQQuv (ORCPT ); Fri, 17 Apr 2020 12:50:51 -0400 Received: from asavdk4.altibox.net ([109.247.116.15]:52200 "EHLO asavdk4.altibox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726429AbgDQQuv (ORCPT ); Fri, 17 Apr 2020 12:50:51 -0400 Received: from ravnborg.org (unknown [158.248.194.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by asavdk4.altibox.net (Postfix) with ESMTPS id E83F780502; Fri, 17 Apr 2020 18:50:42 +0200 (CEST) Date: Fri, 17 Apr 2020 18:50:41 +0200 From: Sam Ravnborg To: Arnd Bergmann Cc: dri-devel@lists.freedesktop.org, Jani Nikula , linux-fbdev@vger.kernel.org, marex@denx.de, dsd@laptop.org, Andrzej Hajda , airlied@linux.ie, masahiroy@kernel.org, Nicolas Pitre , Saeed Mahameed , thellstrom@vmware.com, haojian.zhuang@gmail.com, geert@linux-m68k.org, linux-renesas-soc@vger.kernel.org, Jason Gunthorpe , kieran.bingham+renesas@ideasonboard.com, linux-graphics-maintainer@vmware.com, Laurent.pinchart@ideasonboard.com, jfrederich@gmail.com, robert.jarzmik@free.fr, daniel@zonque.org Subject: Re: [PATCH 6/8] drm: decouple from CONFIG_FB Message-ID: <20200417165041.GA30483@ravnborg.org> References: <20200417155553.675905-1-arnd@arndb.de> <20200417155553.675905-7-arnd@arndb.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200417155553.675905-7-arnd@arndb.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=XpTUx2N9 c=1 sm=1 tr=0 a=UWs3HLbX/2nnQ3s7vZ42gw==:117 a=UWs3HLbX/2nnQ3s7vZ42gw==:17 a=kj9zAlcOel0A:10 a=7gkXJVJtAAAA:8 a=e5mUnYsNAAAA:8 a=9L1dKAkHxsO5wRH54ekA:9 a=CjuIK1q_8ugA:10 a=E9Po1WZjFZOl8hwRPBS3:22 a=Vxmtnl_E_bksehYqCbjh:22 a=pHzHmUro8NiASowvMSCR:22 a=nt3jZW36AmriUCFCBwmW:22 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Hi Arnd. On Fri, Apr 17, 2020 at 05:55:51PM +0200, Arnd Bergmann wrote: > CONFIG_DRM_KMS_FB_HELPER selects CONFIG_FB, which is something it > really should not, to avoid circular dependencies and accidentally > including potentially dangerous user interfaces in the kernel, > so change this into a 'depends on' check. > > Two device drivers currently select CONFIG_DRM_KMS_FB_HELPER, but > as far as I can tell, they do not really need to any more, so those > selects can be removed. > > This leaves DRM_FBDEV_EMULATION as the only thing that rightfully > selects CONFIG_DRM_KMS_FB_HELPER, and this now has to depend on > CONFIG_FB and its dependencies. > > Signed-off-by: Arnd Bergmann > --- > drivers/gpu/drm/Kconfig | 5 +++-- > drivers/gpu/drm/mxsfb/Kconfig | 1 - > drivers/gpu/drm/zte/Kconfig | 1 - > 3 files changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 43594978958e..7c3109133685 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -80,7 +80,7 @@ config DRM_KMS_HELPER > config DRM_KMS_FB_HELPER > bool > depends on DRM_KMS_HELPER > - select FB > + depends on FB > select FRAMEBUFFER_CONSOLE if !EXPERT > select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE > select FB_SYS_FOPS > @@ -111,7 +111,8 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS > > config DRM_FBDEV_EMULATION > bool "Enable legacy fbdev support for your modesetting driver" > - depends on DRM > + depends on DRM && FB > + depends on FB=y || DRM=m > select DRM_KMS_HELPER > select DRM_KMS_FB_HELPER > default y This statement: depends on DRM && FB tell us that both symbols must be either y or m. Any combination of y and m will do the trick Then we have this statement: depends on FB=y || DRM=m It tells us that either FB equals y or DRM equals m. So we have following table FB DRM Result n n n n y n n m n y n n y y y y m y m n n m y N m m y So what this try to say is that we cannot have FB a module while DRM is built-in (marked N in the above). Could you explain in the changelog why this combination is not good. (Or tell me if my analysis was flawed). With this fixed (assuming I am right): Reviewed-by: Sam Ravnborg Sam > diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig > index 0dca8f27169e..33916b7b2c50 100644 > --- a/drivers/gpu/drm/mxsfb/Kconfig > +++ b/drivers/gpu/drm/mxsfb/Kconfig > @@ -10,7 +10,6 @@ config DRM_MXSFB > depends on COMMON_CLK > select DRM_MXS > select DRM_KMS_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_CMA_HELPER > select DRM_PANEL > help > diff --git a/drivers/gpu/drm/zte/Kconfig b/drivers/gpu/drm/zte/Kconfig > index 90ebaedc11fd..aa8594190b50 100644 > --- a/drivers/gpu/drm/zte/Kconfig > +++ b/drivers/gpu/drm/zte/Kconfig > @@ -3,7 +3,6 @@ config DRM_ZTE > tristate "DRM Support for ZTE SoCs" > depends on DRM && ARCH_ZX > select DRM_KMS_CMA_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_HELPER > select SND_SOC_HDMI_CODEC if SND_SOC > select VIDEOMODE_HELPERS > -- > 2.26.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A32EC38A2B for ; Fri, 17 Apr 2020 16:50:52 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5A52C20771 for ; Fri, 17 Apr 2020 16:50:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A52C20771 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ravnborg.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D353E6E0ED; Fri, 17 Apr 2020 16:50:51 +0000 (UTC) Received: from asavdk4.altibox.net (asavdk4.altibox.net [109.247.116.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id D386E6E0ED for ; Fri, 17 Apr 2020 16:50:50 +0000 (UTC) Received: from ravnborg.org (unknown [158.248.194.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by asavdk4.altibox.net (Postfix) with ESMTPS id E83F780502; Fri, 17 Apr 2020 18:50:42 +0200 (CEST) Date: Fri, 17 Apr 2020 18:50:41 +0200 From: Sam Ravnborg To: Arnd Bergmann Subject: Re: [PATCH 6/8] drm: decouple from CONFIG_FB Message-ID: <20200417165041.GA30483@ravnborg.org> References: <20200417155553.675905-1-arnd@arndb.de> <20200417155553.675905-7-arnd@arndb.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200417155553.675905-7-arnd@arndb.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=XpTUx2N9 c=1 sm=1 tr=0 a=UWs3HLbX/2nnQ3s7vZ42gw==:117 a=UWs3HLbX/2nnQ3s7vZ42gw==:17 a=kj9zAlcOel0A:10 a=7gkXJVJtAAAA:8 a=e5mUnYsNAAAA:8 a=9L1dKAkHxsO5wRH54ekA:9 a=CjuIK1q_8ugA:10 a=E9Po1WZjFZOl8hwRPBS3:22 a=Vxmtnl_E_bksehYqCbjh:22 a=pHzHmUro8NiASowvMSCR:22 a=nt3jZW36AmriUCFCBwmW:22 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: marex@denx.de, linux-renesas-soc@vger.kernel.org, linux-fbdev@vger.kernel.org, dsd@laptop.org, Nicolas Pitre , airlied@linux.ie, masahiroy@kernel.org, jfrederich@gmail.com, Saeed Mahameed , thellstrom@vmware.com, haojian.zhuang@gmail.com, Andrzej Hajda , kieran.bingham+renesas@ideasonboard.com, geert@linux-m68k.org, dri-devel@lists.freedesktop.org, linux-graphics-maintainer@vmware.com, robert.jarzmik@free.fr, Jason Gunthorpe , daniel@zonque.org, Laurent.pinchart@ideasonboard.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Arnd. On Fri, Apr 17, 2020 at 05:55:51PM +0200, Arnd Bergmann wrote: > CONFIG_DRM_KMS_FB_HELPER selects CONFIG_FB, which is something it > really should not, to avoid circular dependencies and accidentally > including potentially dangerous user interfaces in the kernel, > so change this into a 'depends on' check. > > Two device drivers currently select CONFIG_DRM_KMS_FB_HELPER, but > as far as I can tell, they do not really need to any more, so those > selects can be removed. > > This leaves DRM_FBDEV_EMULATION as the only thing that rightfully > selects CONFIG_DRM_KMS_FB_HELPER, and this now has to depend on > CONFIG_FB and its dependencies. > > Signed-off-by: Arnd Bergmann > --- > drivers/gpu/drm/Kconfig | 5 +++-- > drivers/gpu/drm/mxsfb/Kconfig | 1 - > drivers/gpu/drm/zte/Kconfig | 1 - > 3 files changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 43594978958e..7c3109133685 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -80,7 +80,7 @@ config DRM_KMS_HELPER > config DRM_KMS_FB_HELPER > bool > depends on DRM_KMS_HELPER > - select FB > + depends on FB > select FRAMEBUFFER_CONSOLE if !EXPERT > select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE > select FB_SYS_FOPS > @@ -111,7 +111,8 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS > > config DRM_FBDEV_EMULATION > bool "Enable legacy fbdev support for your modesetting driver" > - depends on DRM > + depends on DRM && FB > + depends on FB=y || DRM=m > select DRM_KMS_HELPER > select DRM_KMS_FB_HELPER > default y This statement: depends on DRM && FB tell us that both symbols must be either y or m. Any combination of y and m will do the trick Then we have this statement: depends on FB=y || DRM=m It tells us that either FB equals y or DRM equals m. So we have following table FB DRM Result n n n n y n n m n y n n y y y y m y m n n m y N m m y So what this try to say is that we cannot have FB a module while DRM is built-in (marked N in the above). Could you explain in the changelog why this combination is not good. (Or tell me if my analysis was flawed). With this fixed (assuming I am right): Reviewed-by: Sam Ravnborg Sam > diff --git a/drivers/gpu/drm/mxsfb/Kconfig b/drivers/gpu/drm/mxsfb/Kconfig > index 0dca8f27169e..33916b7b2c50 100644 > --- a/drivers/gpu/drm/mxsfb/Kconfig > +++ b/drivers/gpu/drm/mxsfb/Kconfig > @@ -10,7 +10,6 @@ config DRM_MXSFB > depends on COMMON_CLK > select DRM_MXS > select DRM_KMS_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_CMA_HELPER > select DRM_PANEL > help > diff --git a/drivers/gpu/drm/zte/Kconfig b/drivers/gpu/drm/zte/Kconfig > index 90ebaedc11fd..aa8594190b50 100644 > --- a/drivers/gpu/drm/zte/Kconfig > +++ b/drivers/gpu/drm/zte/Kconfig > @@ -3,7 +3,6 @@ config DRM_ZTE > tristate "DRM Support for ZTE SoCs" > depends on DRM && ARCH_ZX > select DRM_KMS_CMA_HELPER > - select DRM_KMS_FB_HELPER > select DRM_KMS_HELPER > select SND_SOC_HDMI_CODEC if SND_SOC > select VIDEOMODE_HELPERS > -- > 2.26.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel