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Wed, 8 Dec 2021 10:40:35 -0800 (PST) Message-ID: Date: Wed, 8 Dec 2021 18:40:31 +0000 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Thunderbird/91.3.2 Subject: Re: [PATCH v3 1/1] iommu/arm-smmu-v3: Simplify useless instructions in arm_smmu_cmdq_build_cmd() Content-Language: en-GB To: John Garry , "Leizhen (ThunderTown)" , Will Deacon , Joerg Roedel , linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20211207094109.1962-1-thunder.leizhen@huawei.com> <20211207094109.1962-2-thunder.leizhen@huawei.com> <9da73d96-c61d-4ed2-607d-4861e6bfd696@huawei.com> <58e8e7c6-a47b-7816-ac74-aefa5b55dd17@huawei.com> <4f296b55-a59a-49b4-ad4d-902bb83a203c@huawei.com> From: Robin Murphy In-Reply-To: <4f296b55-a59a-49b4-ad4d-902bb83a203c@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" T24gMjAyMS0xMi0wOCAxODoxNywgSm9obiBHYXJyeSB3cm90ZToKPj4+IERpZCB5b3Ugbm90aWNl IGFueSBwZXJmb3JtYW5jZSBjaGFuZ2Ugd2l0aCB0aGlzIGNoYW5nZT8KPj4KPj4gSGkgSm9objoK Pj4gwqDCoCBUaGFua3MgZm9yIHRoZSB0aXAuIEkgd3JvdGUgYSB0ZXN0IGNhc2UgdG9kYXksIGFu ZCBJIGZvdW5kIHRoYXQgdGhlCj4+IHBlcmZvcm1hbmNlIGRpZCBub3QgZ28gdXAgYnV0IGRvd24u Cj4gCj4gSSB2ZXJ5IHF1aWNrbHkgdGVzdGVkIG9uIGEgRE1BIG1hcHBpbmcgYmVuY2htYXJrIHZl cnkgc2ltaWxhciB0byB0aGUgCj4ga2VybmVsIERNQSBiZW5jaG1hcmsgbW9kdWxlIC0gSSBnb3Qg bWl4ZWQgcmVzdWx0cy4gRm9yIGZld2VyIENQVXMgKDw4KSwgCj4gYSBzbWFsbCBpbXByb3ZlbWVu dCwgbGlrZSAwLjclLiBGb3IgbW9yZSBDUFVzLCBhIGRpcy1pbXByb3ZlbWVudCAtIAo+IHRoYXQn cyBzdXJwcmlzaW5nLCBJIGRpZCBleHBlY3QganVzdCBubyBjaGFuZ2UgYXMgYW55IGltcHJvdmVt ZW50IHdvdWxkIAo+IGdldCBkd2FyZmVkIGZyb20gdGhlIHNsb3dlciB1bm1hcCByYXRlcyBmb3Ig bW9yZSBDUFVzLiBJIGNhbiBjaGVjayB0aGlzCj4gbW9yZSB0b21vcnJvdy4KPiAKPj4gSXQncyBz byB3ZWlyZC4gU28gSSBkZWNpZGVkIG5vdCB0bwo+PiBjaGFuZ2UgaXQsIGJlY2F1c2UgaXQncyBh bHNvIHBvb3JseSByZWFkYWJsZS4gU28gSSBwbGFuIHRvIG1ha2Ugb25seQo+PiB0aGUgZm9sbG93 aW5nIG1vZGlmaWNhdGlvbnM6Cj4+IEBAIC0yMzcsNyArMjM3LDcgQEAgc3RhdGljIGludCBxdWV1 ZV9yZW1vdmVfcmF3KHN0cnVjdCBhcm1fc21tdV9xdWV1ZSAKPj4gKnEsIHU2NCAqZW50KQo+PiDC oCBzdGF0aWMgaW50IGFybV9zbW11X2NtZHFfYnVpbGRfY21kKHU2NCAqY21kLCBzdHJ1Y3QgCj4+ IGFybV9zbW11X2NtZHFfZW50ICplbnQpCj4+IMKgIHsKPj4gwqDCoMKgwqDCoMKgwqDCoCBtZW1z ZXQoY21kLCAwLCAxIDw8IENNRFFfRU5UX1NaX1NISUZUKTsKPj4gLcKgwqDCoMKgwqDCoCBjbWRb MF0gfD0gRklFTERfUFJFUChDTURRXzBfT1AsIGVudC0+b3Bjb2RlKTsKPj4gK8KgwqDCoMKgwqDC oCBjbWRbMF0gPSBGSUVMRF9QUkVQKENNRFFfMF9PUCwgZW50LT5vcGNvZGUpOwo+Pgo+PiDCoMKg wqDCoMKgwqDCoMKgIHN3aXRjaCAoZW50LT5vcGNvZGUpIHsKPj4gwqDCoMKgwqDCoMKgwqDCoCBj YXNlIENNRFFfT1BfVExCSV9FTDJfQUxMOgo+Pgo+PiBUaGlzIHByZXZlbnRzIHRoZSBjb21waWxl ciBmcm9tIGdlbmVyYXRpbmcgdGhlIGZvbGxvd2luZyB0d28gaW5lZmZpY2llbnQKPj4gaW5zdHJ1 Y3Rpb25zOgo+PiDCoMKgwqDCoMKgIDM5NDrCoMKgwqDCoMKgwqAgZjk0MDAwMDLCoMKgwqDCoMKg wqDCoCBsZHLCoMKgwqDCoCB4MiwgW3gwXcKgwqDCoCAvL3gyID0gY21kWzBdCj4+IMKgwqDCoMKg wqAgMzk4OsKgwqDCoMKgwqDCoCBhYTAyMDA2MsKgwqDCoMKgwqDCoMKgIG9ycsKgwqDCoMKgIHgy LCB4MywgeDLCoMKgwqAgLy94MyA9IAo+PiBGSUVMRF9QUkVQKENNRFFfMF9PUCwgZW50LT5vcGNv ZGUpCj4+Cj4+IE1heWJlIGl0J3Mgbm90IHdvcnRoIGNoYW5naW5nIGJlY2F1c2UgSSd2ZSBvbmx5 IHNlZW4gYSAwLnggbmFub3NlY29uZCAKPj4gcmVkdWN0aW9uCj4+IGluIHBlcmZvcm1hbmNlLiBC dXQgb25lIHRoaW5nIGlzLCBpdCBvbmx5IGNvbWVzIHdpdGggYmVuZWZpdHMsIG5vIHNpZGUgCj4+ IGVmZmVjdHMuCj4+Cj4gCj4gSSBqdXN0IHRoaW5rIHRoYXQgd2l0aCB0aGUgb3JpZ2luYWwgY29k ZSB0aGF0IGNtZFtdIGlzIG9uIHRoZSBzdGFjayBhbmQgCj4gY2FjaGVkLCBzbyBpZiB3ZSBoYXZl IHdyaXRlLWJhY2sgYXR0cmlidXRlICh3aGljaCBJIHRoaW5rIHdlIGRvKSB0aGVuIAo+IHRoZXJl IHdvdWxkIG5vdCBuZWNlc3NhcmlseSBhIHdyaXRlIHRvIGV4dGVybmFsIG1lbW9yeSBwZXIgd3Jp dGUgdG8gY21kW10uCj4gCj4gU28sIGFwYXJ0IGZyb20gdGhpcyBhcHByb2FjaCwgSSB0aGluayB0 aGF0IGlmIHdlIGNhbiBqdXN0IHJlZHVjZSB0aGUgCj4gaW5zdHJ1Y3Rpb25zIHRocm91Z2ggb3Ro ZXIgZWZmaWNpZW5jaWVzIGluIHRoZSBmdW5jdGlvbiB0aGVuIHRoYXQgd291bGQgCj4gYmUgZ29v ZC4KCk5vdCBzdXJlIGlmIGl0J3Mgc3RpbGwgdHJ1ZSwgYnV0IEZXSVcgbGFzdCB0aW1lIHRoZSBi ZXN0IHJlc3VsdCBhY3R1YWxseSAKY2FtZSBmcm9tIGRvaW5nIHRoZSByaWRpY3Vsb3VzbHkgY291 bnRlci1pbnR1aXRpdmU6CgpodHRwczovL2xvcmUua2VybmVsLm9yZy9saW51eC1pb21tdS8xNDFk ZTNjMzI3OGUyODA3MTJkMTZkOWFjOWFiMzA1YzNiODBhODEwLjE1MzQzNDQxNjcuZ2l0LnJvYmlu Lm11cnBoeUBhcm0uY29tLwoKUm9iaW4uCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0cy5saW51eC1mb3Vu ZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0 aW5mby9pb21tdQ==