From patchwork Tue Nov 7 09:17:42 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: 742113 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 F0446C04E83 for ; Tue, 7 Nov 2023 09:20:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233817AbjKGJUf (ORCPT ); Tue, 7 Nov 2023 04:20:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233822AbjKGJUb (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 1116A106 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 1r0IG1-0000IZ-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 1r0IG0-007FlL-Ap; 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 1r0IG0-00ENW7-1c; Tue, 07 Nov 2023 10:20:24 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Helge Deller Cc: Thomas Zimmermann , Sam Ravnborg , Atul Raut , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel@pengutronix.de Subject: [PATCH 01/22] fb: amifb: Stop using platform_driver_probe() Date: Tue, 7 Nov 2023 10:17:42 +0100 Message-ID: <20231107091740.3924258-2-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=2258; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=oG9a0u8ePiuLkRlvrucgb/21kgy596LDbVG/7UHObeY=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBlSgC1g6l8kfiGZf6ynAygClDXnAjXuiMZglr7D 301DDl/mpuJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCZUoAtQAKCRCPgPtYfRL+ TmqUB/wK6QlmNM5mlXhL8RKtrnCHxGYe0CQuYyJnA1GDGHLA5/LyyVw0Csuu9SdZT3jdPqdglPp Fb/K6ywolgkCzdfaGWUatEjvAmoc1fSbL+7cAQuZ96RivUKoQyFBPLMYfD3XY9hCXqogjRTf1WE BzcQ/YKDbFoHuVqE4SGRyV5ovVirgZmQrDPWIydy/nFglqlQRIEbwqhEfGnC1gjEuBvTYV0bPAl jXQhFIRu39qDNiaJOC1GsbtEhugprWuTAgPjp/UPxoIoUWDDU4oSRbNzPIdFfJIlGVRfkte2TyA 9Zo6dID5j4LjKqo7nXTlwIQOmTGhiaOa0UfpvVWIf6jpWBKn 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/amifb: section mismatch in reference: amifb_driver+0x4 (section: .data) -> amifb_remove (section: .exit.text) Signed-off-by: Uwe Kleine-König --- drivers/video/fbdev/amifb.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/video/fbdev/amifb.c b/drivers/video/fbdev/amifb.c index b18c6b4f129a..85da43034166 100644 --- a/drivers/video/fbdev/amifb.c +++ b/drivers/video/fbdev/amifb.c @@ -3530,7 +3530,7 @@ static inline void chipfree(void) * Initialisation */ -static int __init amifb_probe(struct platform_device *pdev) +static int amifb_probe(struct platform_device *pdev) { struct fb_info *info; int tag, i, err = 0; @@ -3752,7 +3752,7 @@ static int __init amifb_probe(struct platform_device *pdev) } -static int __exit amifb_remove(struct platform_device *pdev) +static int amifb_remove(struct platform_device *pdev) { struct fb_info *info = platform_get_drvdata(pdev); @@ -3769,13 +3769,13 @@ static int __exit amifb_remove(struct platform_device *pdev) } static struct platform_driver amifb_driver = { - .remove = __exit_p(amifb_remove), - .driver = { + .probe = amifb_probe, + .remove = amifb_remove, + .driver = { .name = "amiga-video", }, }; - -module_platform_driver_probe(amifb_driver, amifb_probe); +module_platform_driver(amifb_driver); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:amiga-video");