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 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 64494C63706 for ; Fri, 25 Nov 2022 21:21:16 +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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vTWc6n3BqaRPN21EsuNHXNFwnZjoDcnS4c+QQ0e8Vaw=; b=mXCQJXgar1wE35 kMxk+gVOg6gqZdCHC0YDT5u81E3jZ33s4svIWjg0TPzBBHW0FEirbip4PxtwDAofeihKMOY84j2BG bq5JLhQJW5eqPJiCU7v14HV6uZbo6bmneg7Nh0eHCQndmrUEIMVbaDsod+4tky6PijTlGw3edgL7G HyOX/vvltnmAjz3z/2tikPfk7UVD1APP5KoUjIAPA3ug6Dx+2oDTOBQdoHj6aDDYYCGskZpovCLEq eMx6J08X/Rj1hVBbCN6yHNmp9lmzMiXpjqIwl89o5m9Mx5Yeu76WRDMRqfZxqQXw+AoAnndNz6xib IpmvlYUKl/LI8aieb5Kg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oyg8J-002E63-Qf; Fri, 25 Nov 2022 21:21:15 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxuD1-001Sb3-Qj for linux-i3c@lists.infradead.org; Wed, 23 Nov 2022 18:10:59 +0000 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 Cc: Jason Gunthorpe , Maximilian Luz , Andy Shevchenko , linux-kernel@vger.kernel.org, Jens Axboe , "Rafael J. Wysocki" , Len Brown , Stefan Richter , Wolfram Sang , Alexandre Belloni , Dmitry Torokhov , Sean Young , Mauro Carvalho Chehab , Rob Herring , Frank Rowand , Hans de Goede , Mark Gross , Vinod Koul , Bard Liao , Pierre-Louis Bossart , Sanyog Kale , Andreas Noever , Michael Jamet , Mika Westerberg , Yehezkel Bernat , Jiri Slaby , Heikki Krogerus , "Martin K. Petersen" , Chaitanya Kulkarni , Ming Lei , Jilin Yuan , Alan Stern , Sakari Ailus , Thomas Gleixner , Ira Weiny , Dan Williams , Won Chung , alsa-devel@alsa-project.org, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org, linux-block@vger.kernel.org, linux-i2c@vger.kernel.org, linux-i3c@lists.infradead.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, linux1394-devel@lists.sourceforge.net, platform-driver-x86@vger.kernel.org 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-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221123_101056_209133_71E4F3E0 X-CRM114-Status: GOOD ( 13.86 ) X-Mailman-Approved-At: Fri, 25 Nov 2022 13:21:11 -0800 X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org 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 -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c