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 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 EDCECC4332F for ; Sat, 26 Nov 2022 08:14:12 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 2567418CB; Sat, 26 Nov 2022 09:13:21 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 2567418CB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1669450451; bh=7X1Me0V7EXsm5r0OrPDHsQK8HbsG4Re2XTojZLZDjdc=; h=Date:From:To:Subject:References:In-Reply-To:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=uIRljW1Pbpoxkf5npB3N+kg3DIUW2aIeCvYCewmLFdmhbNyxvMTJny7A41mkvm0iv Kk9S0jt6iJIIIxf0Qa6v/bL5bTkNe8Iy9qwydLKhGGXbKXazWoxOu+wpRgzkqGXMte BiAXJuht2gJupqhXszB3hQBf6P9hjE0X+QuqyBr4= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 4AA5BF8070D; Sat, 26 Nov 2022 08:59:30 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 2A219F8025D; Wed, 23 Nov 2022 19:10:58 +0100 (CET) Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id AF6B0F800BB for ; Wed, 23 Nov 2022 19:10:55 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz AF6B0F800BB Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YTyA9A1R" Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 30963B81FE3; Wed, 23 Nov 2022 18:10:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BB2DC433D6; Wed, 23 Nov 2022 18:10:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669227053; bh=7X1Me0V7EXsm5r0OrPDHsQK8HbsG4Re2XTojZLZDjdc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YTyA9A1RK3VBVc4OuLsGmjha4gZZFX3fOAmM46DVvT12a9cMFNag8b+bk1nJBSkOS iYBRuVdyoNseo7VxiYe+zfzA7cAKf7r+yPGFV7L1PjP6Bq7qE0QAPRFkIwzbad3cyJ 8YPFAWrJ2IcD41r/Fw+Je3USDQVOZs3K0ic3VM6I= Date: Wed, 23 Nov 2022 19:10:49 +0100 From: Greg Kroah-Hartman To: Matthew Wilcox Subject: Re: [PATCH 3/5] driver core: make struct device_type.uevent() take a const * Message-ID: References: <20221123122523.1332370-3-gregkh@linuxfoundation.org> <711d5275-7e80-c00d-0cdc-0f3d52175361@gmail.com> <97be39ed-3cea-d55a-caa6-c2652baef399@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Mailman-Approved-At: Sat, 26 Nov 2022 08:58:53 +0100 Cc: Alexandre Belloni , Heikki Krogerus , Sean Young , "Rafael J. Wysocki" , alsa-devel@alsa-project.org, platform-driver-x86@vger.kernel.org, linux-i2c@vger.kernel.org, Andreas Noever , linux-i3c@lists.infradead.org, linux1394-devel@lists.sourceforge.net, Frank Rowand , Dan Williams , Andy Shevchenko , linux-acpi@vger.kernel.org, Bard Liao , Pierre-Louis Bossart , Jason Gunthorpe , Alan Stern , linux-serial@vger.kernel.org, linux-input@vger.kernel.org, Won Chung , Len Brown , devicetree@vger.kernel.org, Chaitanya Kulkarni , Ira Weiny , Michael Jamet , Ming Lei , Mark Gross , Hans de Goede , Rob Herring , Jiri Slaby , Thomas Gleixner , Mauro Carvalho Chehab , Mika Westerberg , Jens Axboe , linux-block@vger.kernel.org, Jilin Yuan , "Martin K. Petersen" , Dmitry Torokhov , linux-kernel@vger.kernel.org, Wolfram Sang , Vinod Koul , Stefan Richter , Sakari Ailus , Yehezkel Bernat , Sanyog Kale , linux-media@vger.kernel.org, Maximilian Luz , linux-usb@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On Wed, Nov 23, 2022 at 05:49:36PM +0000, Matthew Wilcox wrote: > On Wed, Nov 23, 2022 at 01:29:56PM -0400, Jason Gunthorpe wrote: > > #define generic_container_of(in_type, in, out_type, out_member) \ > > _Generic(in, \ > > const in_type *: ((const out_type *)container_of(in, out_type, out_member)), \ > > in_type *: ((out_type *)container_of(in, out_type, out_member)) \ > > ) > > There's a neat trick I found in seqlock.h: > > #define generic_container_of(in_t, in, out_t, m) \ > _Generic(*(in), \ > const in_t: ((const out_t *)container_of(in, out_t, m)), \ > in_t: ((out_t *)container_of(in, out_type, m)) \ > ) > > and now it fits in 80 columns ;-) Nice trick! Dropping the inline functions is a bit different, let me see if that still gives a sane error if we pass an incorrect type or mess with the const * the wrong way. I'll run some tests tomorrow afternoon... thanks, greg k-h