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 93CE1FD706D for ; Tue, 17 Mar 2026 10:17:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZPn6IHFB3av8NwaUhQnPXimsAv1ybFnsn8TpD5pwo5E=; b=tCs6RL2OEpAvjbtuhNKqjsEIAn y9WqY4TEb2U2sjd/O/SyU/IFRX4GdLkhOl5d/fydAnCH6+C25H006BCZiN3yQUVQFHrguPdYRz+LR dCAQ/tLx6VRiLh5lAmiivJMhEdrmN/OL2XzXwzloF1iCornnsOlEo51vUcN7swLzhNsmwVAUtAf8G yEtgdksu+R1BheRT7o2ANZV7goVeu4Q4ddHKY6X9RGnazB2uVc2G6DakZMGcvXKmewxWRxgIWAI0b 9oj3Xvc+oKDfM1D4yOOrWiQKvDQP6PrIcw9IDLb+DRWtoHwWaTJm05StDC6dV6gonMeeILRJlDq6m BlEgvsDg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2RU0-00000005yEA-2iZo; Tue, 17 Mar 2026 10:17:04 +0000 Received: from mgamail.intel.com ([198.175.65.20]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2RTx-00000005yDS-1YKn for linux-arm-kernel@lists.infradead.org; Tue, 17 Mar 2026 10:17:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1773742622; x=1805278622; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=I2H5RJoMGFDqFLBEur/g+zezU/OdI5LfzcovXuA1vSY=; b=aWEomMbThYXaZkE/Po8eNtPLEIKGprtrxKXg/wuGnM9Xk+VneHoTvNKZ 159v6iimfup27IrvjwhTptOcRUbeTS2BltslNL9dZ7rnLO9GBe1hm95gL di51eqq4hGdYe4TIrb3ZMHR6+Sj9ppyjC5jEhlAI8yk0YQtQyy484Ql/T pvHJ4L9/bK3j8+GEUG4FHm/dIEJW+QsSMRPgMUu+xYIUf1NKpk0lP/Tn5 sKoKAOxpoYksWYAViTmOXUoYrZ0FNlq4sqYbCFmtjf4CxrIfa3gzcNgVf CkSMRLQSYkIq7ZxnQX3bCdkqrVb+t6o+hK+CL/cU0/OLkkEZhZ4kq3u14 w==; X-CSE-ConnectionGUID: 0ySBhjeuSGC6GClXNIehGQ== X-CSE-MsgGUID: qoOpxEZGRVCapeW9MB8VlA== X-IronPort-AV: E=McAfee;i="6800,10657,11731"; a="74472229" X-IronPort-AV: E=Sophos;i="6.23,124,1770624000"; d="scan'208";a="74472229" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2026 03:17:01 -0700 X-CSE-ConnectionGUID: YWwwfd8QSr+Yegj693ADXA== X-CSE-MsgGUID: Bjwo4+7+Q/OCfHxBHIvODg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,124,1770624000"; d="scan'208";a="260126206" Received: from abityuts-desk.ger.corp.intel.com (HELO localhost) ([10.245.245.97]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2026 03:16:53 -0700 Date: Tue, 17 Mar 2026 12:16:50 +0200 From: Andy Shevchenko To: Wolfram Sang Cc: Douglas Anderson , Greg Kroah-Hartman , "Rafael J . Wysocki" , Danilo Krummrich , stable@vger.kernel.org, Andrew Lunn , Daniel Scally , "David S. Miller" , Eric Dumazet , Fabio Estevam , Frank Li , Heikki Krogerus , Heiner Kallweit , Jakub Kicinski , Len Brown , Mark Brown , Paolo Abeni , Pengutronix Kernel Team , Rob Herring , Russell King , Sakari Ailus , Saravana Kannan , Sascha Hauer , devicetree@vger.kernel.org, driver-core@lists.linux.dev, imx@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] device property: Make modifications of fwnode "flags" thread safe Message-ID: References: <20260316154159.1.I0a4d03104ecd5103df3d76f66c8d21b1d15a2e38@changeid> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260317_031701_443631_3A1C3458 X-CRM114-Status: GOOD ( 15.29 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Mar 17, 2026 at 09:42:38AM +0100, Wolfram Sang wrote: > > > > What's the alignment for the u8 member in your SoC? 4 bytes or 8 bytes? > > > (I assume it's 64-bit SoC.) > > > > FWIW, with the given change it will be still inside 64-byte data structure > > which most likely occupies a single cache line (before this patch and after > > as well). > > I consider this directon of the discussion irrelevant. If the number is > (maybe? That's to be discussed!) needlessly bigger than 0, then it > doesn't matter how big the number is. That's why it was written 'FWIW', so it doesn't worth :-) > Why don't you like the idea of taking the lock? Like Danilo I am also not sure what lock protects fwnode accesses. -- With Best Regards, Andy Shevchenko