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=-5.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 6FB3EC433DB for ; Mon, 18 Jan 2021 12:59:37 +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 DA16322571 for ; Mon, 18 Jan 2021 12:59:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA16322571 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 6BD1186354; Mon, 18 Jan 2021 12:59:36 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kw37bEAiBcNS; Mon, 18 Jan 2021 12:59:34 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id AD555863D0; Mon, 18 Jan 2021 12:59:34 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8C4A2C088B; Mon, 18 Jan 2021 12:59:34 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2DD02C013A for ; Mon, 18 Jan 2021 12:59:33 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 12F118701F for ; Mon, 18 Jan 2021 12:59:33 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RTPI2ewz79Xs for ; Mon, 18 Jan 2021 12:59:32 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by hemlock.osuosl.org (Postfix) with ESMTP id 24F3C8700D for ; Mon, 18 Jan 2021 12:59:32 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 52AC731B; Mon, 18 Jan 2021 04:59:31 -0800 (PST) Received: from [10.57.39.58] (unknown [10.57.39.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2E36F3F719; Mon, 18 Jan 2021 04:59:30 -0800 (PST) Subject: Re: [PATCH v4 2/3] iommu/iova: Avoid double-negatives in magazine helpers To: John Garry , Jean-Philippe Brucker References: <1607538189-237944-1-git-send-email-john.garry@huawei.com> <1607538189-237944-3-git-send-email-john.garry@huawei.com> <69c30e85-4a72-a0e1-1e56-4ffbd0df5aba@huawei.com> From: Robin Murphy Message-ID: <69614e38-fcc0-4220-e1cd-15de91dd61ef@arm.com> Date: Mon, 18 Jan 2021 12:59:26 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Cc: will@kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linuxarm@huawei.com 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" T24gMjAyMS0wMS0xOCAxMDo1NSwgSm9obiBHYXJyeSB3cm90ZToKPiBPbiAxOC8wMS8yMDIxIDEw OjA4LCBKZWFuLVBoaWxpcHBlIEJydWNrZXIgd3JvdGU6Cj4+Pj4gQW55IGlkZWEgd2h5IHRoYXQn cyBoYXBwZW5pbmc/wqAgVGhpcyBmaXggc2VlbXMgb2sgYnV0IGlmIHdlJ3JlIAo+Pj4+IGV4cGVj dGluZwo+Pj4+IGFsbG9jYXRpb24gZmFpbHVyZXMgZm9yIHRoZSBsb2FkZWQgbWFnYXppbmUgdGhl biB3ZSBjb3VsZCBlYXNpbHkgZ2V0IGl0Cj4+Pj4gZm9yIGNwdV9yY2FjaGVzIHRvbywgYW5kIGdl dCBhIHNpbWlsYXIgYWJvcnQgYXQgcnVudGltZS4KPj4+IEl0J3Mgbm90IHNwZWNpZmljYWxseSB0 aGF0IHdlIGV4cGVjdCB0aGVtIChhbGxvY2F0aW9uIGZhaWx1cmVzIGZvciB0aGUKPj4+IGxvYWRl ZCBtYWdhemluZSksIHJhdGhlciB3ZSBzaG91bGQgbWFrZSBzYWZlIGFnYWluc3QgaXQuCj4+Pgo+ Pj4gU28gY291bGQgeW91IGJlIG1vcmUgc3BlY2lmaWMgaW4geW91ciBjb25jZXJuIGZvciB0aGUg Y3B1X3JjYWNoZSAKPj4+IGZhaWx1cmU/Cj4+PiBjcHVfcmNhY2hlIG1hZ2F6aW5lIGFzc2lnbm1l bnQgY29tZXMgZnJvbSB0aGlzIGxvZ2ljLgo+PiBJZiB0aGlzIGZhaWxzOgo+Pgo+PiBkcml2ZXJz L2lvbW11L2lvdmEuYzo4NDc6IHJjYWNoZS0+Y3B1X3JjYWNoZXMgPSAKPj4gX19hbGxvY19wZXJj cHUoc2l6ZW9mKCpjcHVfcmNhY2hlKSwgY2FjaGVfbGluZV9zaXplKCkpOwo+Pgo+PiB0aGVuIHdl J2xsIGdldCBhbiBPb3BzIGluIF9faW92YV9yY2FjaGVfZ2V0KCkuIFNvIGlmIHdlJ3JlIG1ha2lu ZyB0aGUKPj4gbW9kdWxlIHNhZmVyIGFnYWluc3QgbWFnYXppbmUgYWxsb2NhdGlvbiBmYWlsdXJl LCBzaG91bGRuJ3Qgd2UgYWxzbwo+PiBwcm90ZWN0IGFnYWluc3QgY3B1X3JjYWNoZXMgYWxsb2Nh dGlvbiBmYWlsdXJlPwo+IAo+IEFoLCBnb3RjaGEuIFNvIHdlIGhhdmUgdGhlIFdBUk4gdGhlcmUs IGJ1dCB0aGF0J3Mgbm90IG11Y2ggdXNlIGFzIHRoaXMgCj4gd291bGQgc3RpbGwgY3Jhc2gsIGFz IHlvdSBzYXkuCj4gCj4gU28gbWF5YmUgd2UgY2FuIGVtYmVkIHRoZSBjcHUgcmNhY2hlcyBpbiBp b3ZhX2RvbWFpbiBzdHJ1Y3QsIHRvIGF2b2lkIAo+IHRoZSBzZXBhcmF0ZSAoZmFpbGFibGUpIGNw dSByY2FjaGUgYWxsb2NhdGlvbi4KCklzIHRoYXQgZXZlbiBwb3NzaWJsZT8gVGhlIHNpemUgb2Yg cGVyY3B1IGRhdGEgaXNuJ3Qga25vd24gYXQgY29tcGlsZSAKdGltZSwgc28gYXQgYmVzdCBpdCB3 b3VsZCBhZGQgdWdseSBydW50aW1lIGNvbXBsZXhpdHkgdG8gYW55IGFsbG9jYXRpb24gCm9mIGEg c3RydWN0IGlvdmFfZG9tYWluIGJ5IGl0c2VsZiwgYnV0IHdvcnNlIHRoYW4gdGhhdCBpdCBtZWFu cyB0aGF0IAplbWJlZGRpbmcgaW92YV9kb21haW4gaW4gYW55IG90aGVyIHN0cnVjdHVyZSBiZWNv bWVzIGNvbXBsZXRlbHkgYnJva2VuLCBubz8KClJvYmluLgoKPiBBbHRlcm5hdGl2ZWx5LCB3ZSBj b3VsZCBhZGQgTlVMTCBjaGVja3MgX19pb3ZhX3JjYWNoZV9nZXQoKSBldCBhbCBmb3IgCj4gdGhp cyBhbGxvY2F0aW9uIGZhaWx1cmUgYnV0IHRoYXQncyBub3QgcHJlZmVyYWJsZSBhcyBpdCdzIGZh c3RwYXRoLgo+IAo+IEZpbmFsbHkgc28gd2UgY291bGQgcGFzcyBiYWNrIGFuIGVycm9yIGNvZGUg ZnJvbSBpbml0X2lvdmFfcmNhY2hlKCkgdG8gCj4gaXRzIG9ubHkgY2FsbGVyLCBpbml0X2lvdmFf ZG9tYWluKCk7IGJ1dCB0aGF0IGhhcyBtdWx0aXBsZSBjYWxsZXJzIGFuZCAKPiB3b3VsZCBuZWVk IHRvIGJlIGZpeGVkIHVwLgo+IAo+IE5vdCBzdXJlIHdoaWNoIGlzIGJlc3Qgb3Igb24gb3RoZXIg b3B0aW9ucy4KPiAKPiBUaGFua3MsCj4gSm9obgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwppb21tdSBtYWlsaW5nIGxpc3QKaW9tbXVAbGlzdHMubGludXgt Zm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4v bGlzdGluZm8vaW9tbXU=