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 X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 255C1C433E9 for ; Mon, 28 Dec 2020 16:47:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 005082245C for ; Mon, 28 Dec 2020 16:47:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728481AbgL1QrM (ORCPT ); Mon, 28 Dec 2020 11:47:12 -0500 Received: from www.zeus03.de ([194.117.254.33]:41050 "EHLO mail.zeus03.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728627AbgL1Mzt (ORCPT ); Mon, 28 Dec 2020 07:55:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=sang-engineering.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=k1; bh=cUkCmu3K5ZBrw9JS/0zXOSslVzo2 IcTlMaVAEVlMv64=; b=aitghaC+Sz/FmOJ0sA4ASt9o7xQl/IOD8f4yhEZR1U97 C9uxXbMnlsLRkl3Mjwv3G1y1JHP78x2Z3HSb+W8/XnhXGQ9nWnd2Xh4OYCUfG89k PrkL4sTG3QMMLGBu7oJ8orBL2RwYInP+Tw8UVcDSrQO01cYwDlyaYW5MelH7W60= Received: (qmail 1758329 invoked from network); 28 Dec 2020 13:55:07 +0100 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 28 Dec 2020 13:55:07 +0100 X-UD-Smtp-Session: l3s3148p1@ZiKZyIW37pUgAwDPXwIpAOUwDQytQs2L Date: Mon, 28 Dec 2020 13:55:07 +0100 From: Wolfram Sang To: Geert Uytterhoeven Cc: Linux I2C , Linux-Renesas , Kuninori Morimoto , Yoshihiro Shimoda Subject: Re: [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition Message-ID: <20201228125507.GD10822@kunai> Mail-Followup-To: Wolfram Sang , Geert Uytterhoeven , Linux I2C , Linux-Renesas , Kuninori Morimoto , Yoshihiro Shimoda References: <20201223172154.34462-1-wsa+renesas@sang-engineering.com> <20201223172154.34462-3-wsa+renesas@sang-engineering.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Qrgsu6vtpU/OV/zm" Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org --Qrgsu6vtpU/OV/zm Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > But if this really can make a difference, IMHO it is still broken It *is* broken on Gen2, no way around that. We can only minimze the race best as we can. --Qrgsu6vtpU/OV/zm Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAl/p1asACgkQFA3kzBSg KbbO4A/+J70Auekngjemk5Awmyr634n5FxmgB6LEvBjf7L4+lGD7fj3fKbEWFe9k QET6JThjcNlnVwQHGIpZevXuCyv8cXqKKFIt+S3Hm3nRFWaK+qjZvlVRSAgs5ueN ERXHltsjWPM2HVgxGS+d2WoG7Y6/CyCFE8PmgeIJE6i32jGLUgZckOWZjWLYbpUc elSKxAHBv9gXWAOO3f69zvgAjOrB8VhLS12hM/0SpjsTxJYGVqIREu/mPgWpIEv3 8SWlwcQC/pk/Kq0zSsGHFOvBp3zwhQgc2pe/WAGnO87KFtZk9/6Ev/sTv424zijS EVMTNa6o07mr/izhAPt8Zdvf+S0d8Bt6xu51Ufd7xEvMxvCZqWPuICPWg8rNCW+G zC2iiliTi/9CV5xr6ONyFmBTa2FSWVpfxGmal+SalTvOAJrwrIham2iua62PMc3i 1R0O6lMK0OQ10dB/9kGbIR6KrlnGwxTy/b5u83+RBkUv2iOAeNYb4m24IL+MhTWM edXeMWl7OUYWqpaOn32djrGzAeQkrgNOGTqofmpopp3s0FMTY4MYvcqKOKp0HVp6 jDBvs1BCqgwqMFr1KcESen1vM5YGnj2ndJ+Gphi7cjSo+wuZ0nOkpOLHXkvOVaZX C6ZvHLR6hKqhyKcpNcqVktOKYRYRUxVPK/94m4oq2xWSdeLYBME= =7sFN -----END PGP SIGNATURE----- --Qrgsu6vtpU/OV/zm--