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: 13448144 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D3E06C0018C for ; Tue, 7 Nov 2023 09:21:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=GMB1VSV8zM8ayKJ+jJbA0kg37JjYIkZYdgtTNy+1V68=; b=2FNkc1buGREH9U /5g7BpqHIIakfBOZYj1OpbDpJNI80bvDlyfTgm+JqGnCx65J1snqx0QBH/0D9tF5qnoyDajrvncuy b3o+xAFEs7gdHMQvObDqlJ8ZbU5/NZROw+bXfMnHuPnW/kcXurMi1VeX+tZ6IRT0WpxTTkJGLsVIL v5asJgT3RGPPUvpCOk0noNP17CwdELS78okmxb4G1X2+c7QA9SGXuK32SjfDnUghNF0WwaErtK0H2 90LHvvrg+Lowu+hODsGJfREjHlF7leikXQnPogFEOqYVQtz0ly/5TFCS0Pa4+jelFaElHlBRL/Euc mpGERYE6UOYHV131EcQA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r0IGB-000tvG-1U; Tue, 07 Nov 2023 09:20:35 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r0IG8-000ttP-0o for linux-arm-kernel@lists.infradead.org; Tue, 07 Nov 2023 09:20:34 +0000 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 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-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231107_012032_287135_1F795215 X-CRM114-Status: GOOD ( 17.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Belloni , kernel@pengutronix.de, dri-devel@lists.freedesktop.org, Claudiu Beznea , linux-fbdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 ");