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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 2C54AC433E0 for ; Tue, 23 Jun 2020 10:21:24 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F3E3D20702 for ; Tue, 23 Jun 2020 10:21:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F3E3D20702 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; 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Tue, 23 Jun 2020 10:21:19 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VUfYMbcp904s for ; Tue, 23 Jun 2020 10:21:19 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 0A48B86C08 for ; Tue, 23 Jun 2020 10:21:18 +0000 (UTC) Received: from lhreml724-chm.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id E5BDFB336F6AE3172B42; Tue, 23 Jun 2020 11:21:16 +0100 (IST) Received: from [127.0.0.1] (10.47.2.88) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Tue, 23 Jun 2020 11:21:15 +0100 Subject: Re: [PATCH 4/4] iommu/arm-smmu-v3: Remove cmpxchg() in arm_smmu_cmdq_issue_cmdlist() To: Rikard Falkeborn , "joro@8bytes.org" References: <1592846920-45338-5-git-send-email-john.garry@huawei.com> <202006230905.3HpPgtSC%lkp@intel.com> <5ba2e240-b324-d316-c00c-38c03ee49baa@huawei.com> From: John Garry Message-ID: Date: Tue, 23 Jun 2020 11:19:47 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.47.2.88] X-ClientProxiedBy: lhreml730-chm.china.huawei.com (10.201.108.81) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Cc: "trivial@kernel.org" , kernel test robot , will@kernel.org, "linux-kernel@vger.kernel.org" , Linuxarm , "iommu@lists.linux-foundation.org" , "maz@kernel.org" , "kbuild-all@lists.01.org" , "robin.murphy@arm.com" , "linux-arm-kernel@lists.infradead.org" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMjMvMDYvMjAyMCAxMDozNSwgUmlrYXJkIEZhbGtlYm9ybiB3cm90ZToKPiAKPiAgICAgSSdk IHNheSB0aGF0IEdFTk1BU0tfSU5QVVRfQ0hFQ0soKSBzaG91bGQgYmUgYWJsZSB0byBoYW5kbGUg YSBsPTAgYW5kCj4gICAgIGg9dW5zaWduZWQgdmFsdWUsIHNvIEkgZG91YnQgdGhpcyB3YXJuLgo+ IAo+ICAgICBVc2luZyBHRU5NQVNLKChpbnQpY21kcS0+cS5sbHEubWF4X25fc2hpZnQsIDApIHJl c29sdmVzIGl0LCBidXQgaXQKPiAgICAgbG9va3MKPiAgICAgbGlrZSBHRU5NQVNLX0lOUFVUX0NI RUNLKCkgY291bGQgYmUgaW1wcm92ZWQuCj4gCj4gCj4gSW5kZWVkIGl0IGNvdWxkLCBpdCBpcyBm aXhlZCBpbiAtbmV4dC4KCm9rLCB0aGFua3MgZm9yIHRoZSBwb2ludGVyLCBidXQgSSBzdGlsbCBz ZWUgdGhpcyBvbiB0b2RheSdzIC1uZXh0IHdpdGggCnRoaXMgcGF0Y2g6CgptYWtlIFc9MSBkcml2 ZXJzL2lvbW11L2FybS1zbW11LXYzLm8KCkluIGZpbGUgaW5jbHVkZWQgZnJvbSAuL2luY2x1ZGUv bGludXgvYml0cy5oOjIzOjAsCiAgICAgICAgICAgICAgICAgZnJvbSAuL2luY2x1ZGUvbGludXgv aW9wb3J0Lmg6MTUsCiAgICAgICAgICAgICAgICAgZnJvbSAuL2luY2x1ZGUvbGludXgvYWNwaS5o OjEyLAogICAgICAgICAgICAgICAgIGZyb20gZHJpdmVycy9pb21tdS9hcm0tc21tdS12My5jOjEy Ogpkcml2ZXJzL2lvbW11L2FybS1zbW11LXYzLmM6IEluIGZ1bmN0aW9uIOKAmGFybV9zbW11X2Nt ZHFfaXNzdWVfY21kbGlzdOKAmToKLi9pbmNsdWRlL2xpbnV4L2JpdHMuaDoyNzo3OiB3YXJuaW5n OiBjb21wYXJpc29uIG9mIHVuc2lnbmVkIGV4cHJlc3Npb24gCjwgMCBpcyBhbHdheXMgZmFsc2Ug Wy1XdHlwZS1saW1pdHNdCiAgIChsKSA+IChoKSwgMCkpKQogICAgICAgXgouL2luY2x1ZGUvbGlu dXgvYnVpbGRfYnVnLmg6MTY6NjI6IG5vdGU6IGluIGRlZmluaXRpb24gb2YgbWFjcm8gCuKAmEJV SUxEX0JVR19PTl9aRVJP4oCZCiNkZWZpbmUgQlVJTERfQlVHX09OX1pFUk8oZSkgKChpbnQpKHNp emVvZihzdHJ1Y3QgeyBpbnQ6KC0hIShlKSk7IH0pKSkKICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBeCi4vaW5jbHVkZS9saW51eC9i aXRzLmg6NDA6Mzogbm90ZTogaW4gZXhwYW5zaW9uIG9mIG1hY3JvIArigJhHRU5NQVNLX0lOUFVU X0NIRUNL4oCZCiAgKEdFTk1BU0tfSU5QVVRfQ0hFQ0soaCwgbCkgKyBfX0dFTk1BU0soaCwgbCkp CiAgIF5+fn5+fn5+fn5+fn5+fn5+fn4KZHJpdmVycy9pb21tdS9hcm0tc21tdS12My5jOjE0MDQ6 MTg6IG5vdGU6IGluIGV4cGFuc2lvbiBvZiBtYWNybyDigJhHRU5NQVNL4oCZCiAgdTMyIHByb2Rf bWFzayA9IEdFTk1BU0soY21kcS0+cS5sbHEubWF4X25fc2hpZnQsIDApOwoKVGhhdCdzIGdjYyA3 LjUuMCAuCgpDaGVlcnMsCkpvaG4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5saW51eC1mb3VuZGF0 aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0aW5m by9pb21tdQ==