From patchwork Tue Nov 7 09:17:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 13448101 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E21F2C04E88 for ; Tue, 7 Nov 2023 09:20:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233828AbjKGJUg (ORCPT ); Tue, 7 Nov 2023 04:20:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233833AbjKGJUb (ORCPT ); Tue, 7 Nov 2023 04:20:31 -0500 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F72C135 for ; Tue, 7 Nov 2023 01:20:28 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r0IG1-0000Ia-7N; Tue, 07 Nov 2023 10:20:25 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1r0IG0-007FlO-Jz; Tue, 07 Nov 2023 10:20:24 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1r0IG0-00ENWA-8S; Tue, 07 Nov 2023 10:20:24 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Helge Deller Cc: Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de Subject: [PATCH 02/22] fb: atmel_lcdfb: Stop using platform_driver_probe() Date: Tue, 7 Nov 2023 10:17:43 +0100 Message-ID: <20231107091740.3924258-3-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.42.0.586.gbc5204569f7d.dirty In-Reply-To: <20231107091740.3924258-1-u.kleine-koenig@pengutronix.de> References: <20231107091740.3924258-1-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2613; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=dViB4btntHJ8M6t2Xogb0R6R3AcjJZCT3JGQYrKvEno=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBlSgC2f+uKvbz9/nNrsa9JiZSvDTZ/flnLpvlDk HrLIcTj6s+JATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCZUoAtgAKCRCPgPtYfRL+ TuWrCACHxojW66Ruyo7Q9FV007Rvu0G1GK7/0ei2gddy1gnhgoj5PLFm3ShyqF1fn2UPq18F3gX 2bKTSwKHvJ/qSHpnEkCqf5yZB6Nf0CT+PuOnXho0v9ccL/zcHp8GW2TvaaUZHI8Kw792Ut6BZgW xbEhZBn24Xq3iVvkBZ2vsYx4JJoyNipKagrDE2rMZK7lIZBdM4NA5Dp/59Z2eulL4mzZEl/VNY9 qyeylRWqN7RffrjgsJO8suNDWORZfhygfnANCwMlJTco93tlJzE2fN20o2IvI5xlwXW/EeX7cJW AsnheFt8g+Q/Nca6ehrM2JI9V4d9uD3+gKhnd8NkLerQ08ou X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-fbdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On today's platforms the benefit of platform_driver_probe() isn't that relevant any more. It allows to drop some code after booting (or module loading) for .probe() and discard the .remove() function completely if the driver is built-in. This typically saves a few 100k. The downside of platform_driver_probe() is that the driver cannot be bound and unbound at runtime which is ancient and also slightly complicates testing. There are also thoughts to deprecate platform_driver_probe() because it adds some complexity in the driver core for little gain. Also many drivers don't use it correctly. This driver for example misses to mark the driver struct with __refdata which is needed to suppress a (W=1) modpost warning: WARNING: modpost: drivers/video/fbdev/atmel_lcdfb: section mismatch in reference: atmel_lcdfb_driver+0x4 (section: .data) -> atmel_lcdfb_remove (section: .exit.text) Signed-off-by: Uwe Kleine-König --- drivers/video/fbdev/atmel_lcdfb.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c index a908db233409..b218731ef732 100644 --- a/drivers/video/fbdev/atmel_lcdfb.c +++ b/drivers/video/fbdev/atmel_lcdfb.c @@ -1017,7 +1017,7 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo) return ret; } -static int __init atmel_lcdfb_probe(struct platform_device *pdev) +static int atmel_lcdfb_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct fb_info *info; @@ -1223,7 +1223,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev) return ret; } -static int __exit atmel_lcdfb_remove(struct platform_device *pdev) +static int atmel_lcdfb_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct fb_info *info = dev_get_drvdata(dev); @@ -1301,7 +1301,8 @@ static int atmel_lcdfb_resume(struct platform_device *pdev) #endif static struct platform_driver atmel_lcdfb_driver = { - .remove = __exit_p(atmel_lcdfb_remove), + .probe = atmel_lcdfb_probe, + .remove = atmel_lcdfb_remove, .suspend = atmel_lcdfb_suspend, .resume = atmel_lcdfb_resume, .driver = { @@ -1310,7 +1311,7 @@ static struct platform_driver atmel_lcdfb_driver = { }, }; -module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe); +module_platform_driver(atmel_lcdfb_driver, ); MODULE_DESCRIPTION("AT91 LCD Controller framebuffer driver"); MODULE_AUTHOR("Nicolas Ferre ");