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[106.72.41.33]) by smtp.gmail.com with ESMTPSA id w145sm9410903pfc.39.2021.07.19.08.22.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Jul 2021 08:22:41 -0700 (PDT) Subject: Re: [PATCH v4 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall To: Geert Uytterhoeven Cc: Palmer Dabbelt , Guenter Roeck , Qiu Wenbo , Paul Walmsley , Albert Ou , linux-riscv , Linux Kernel Mailing List References: <5e1b5d90-5a1e-5e9f-7b92-6c53b8589c2a@gmail.com> From: Akira Tsukamoto Message-ID: <97ee158e-0fe8-cd7a-6ee2-35f9018838de@gmail.com> Date: Tue, 20 Jul 2021 00:22:37 +0900 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210719_082242_612265_D683E426 X-CRM114-Status: GOOD ( 19.79 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org SGkgR2VlcnQsCgpPbiA3LzE5LzIwMjEgMTE6NDkgUE0sIEdlZXJ0IFV5dHRlcmhvZXZlbiB3cm90 ZToKPiBIaSBUc3VrYW1vdG8tc2FuLAo+IAo+IE9uIE1vbiwgSnVsIDE5LCAyMDIxIGF0IDI6NTMg UE0gQWtpcmEgVHN1a2Ftb3RvCj4gPGFraXJhLnRzdWthbW90b0BnbWFpbC5jb20+IHdyb3RlOgo+ PiBUaGlzIHBhdGNoIHdpbGwgcmVkdWNlIGNwdSB1c2FnZSBkcmFtYXRpY2FsbHkgaW4ga2VybmVs IHNwYWNlIGVzcGVjaWFsbHkKPj4gZm9yIGFwcGxpY2F0aW9uIHdoaWNoIHVzZSBzeXMtY2FsbCB3 aXRoIGxhcmdlIGJ1ZmZlciBzaXplLCBzdWNoIGFzCj4+IG5ldHdvcmsgYXBwbGljYXRpb25zLiBU aGUgbWFpbiByZWFzb24gYmVoaW5kIHRoaXMgaXMgdGhhdCBldmVyeQo+PiB1bmFsaWduZWQgbWVt b3J5IGFjY2VzcyB3aWxsIHJhaXNlIGV4Y2VwdGlvbnMgYW5kIHN3aXRjaCBiZXR3ZWVuIHMtbW9k ZQo+PiBhbmQgbS1tb2RlIGNhdXNpbmcgbGFyZ2Ugb3ZlcmhlYWQuCj4gCj4gWy4uLl0KPiAKPj4g U2lnbmVkLW9mZi1ieTogQWtpcmEgVHN1a2Ftb3RvIDxha2lyYS50c3VrYW1vdG9AZ21haWwuY29t Pgo+IAo+IFRoYW5rcyBmb3IgeW91ciBwYXRjaCEKClRoYW5rcyBmb3IgdHJ5aW5nIQoKPiAKPiBB cyB2MyBpcyBwYXJ0IG9mIHY1LjE0LXJjMSwgYWxsIGZpeGVzIGFuZCBpbXByb3ZlbWVudHMgbmVl ZCB0byBiZQo+IHNlbmQgYXMgaW5jcmVtZW50YWwgcGF0Y2hlcy4KClllYWgsIEkgd2FzIG5vdCBw YXlpbmcgYXR0ZW50aW9uIHRvIHY1LjE0LXJjMS4gV2lsbCByZWdlbmVyYXRlIGl0IAp3aGVuIEkg c3BvdCB0aGUgcmVtYWluaW5nIGJ1ZyBvbiBydjMyLgoKPiAKPiBBZnRlciByZXZlcnRpbmcgY2E2 ZWFhYTIxMGRlZWMwZSAoInJpc2N2OiBfX2FzbV9jb3B5X3RvLWZyb21fdXNlcjoKPiBPcHRpbWl6 ZSB1bmFsaWduZWQgbWVtb3J5IGFjY2VzcyBhbmQgcGlwZWxpbmUgc3RhbGwiKSBhbmQgYXBwbHlp bmcKPiB2NCwgYm9vdGluZyBsaW51eC1vbi1saXRleC12ZXhyaXNjdiBzdGlsbCBmYWlscywgYnV0 IG5vdyBkaWZmZXJlbnRseQo+IChyZWFsIGNyYXNoKToKClRoaXMgdGltZSBpdCBsb29rcyBsaWtl IHVuZGVyIGNvcHkgaW5zdGVhZCBvZiBvdmVycnVuIGNvcHkgbGFzdCB0aW1lLgpUaGUgU1pSRUcs IExHUkVHLCBSRUdfTCBhbmQgUkVHX1Mgc2hvdWxkIGJlZW4gdGFraW5nIGNhcmUgb2YgdGhlIApk aWZmZXJlbmNlIG9mIHJ2MzIgYW5kIHJ2NjQsIGJ1dCBwcm9iYWJseSBzdGlsbCBmb3JnZXR0aW5n IGFwcGx5aW5nCnNvbWUgcGxhY2VzLgoKQWtpcmEKCj4gCj4gICAgIC9iae+/ve+/ve+/ve+/ve+/ vVbvv71GLTogYXBwbGV0IG5vdCBmb3VuZAo+ICAgICAyJ++/ve+/ve+/ve+/ve+/vXQ6IGFwcGxl dCBub3QgZm91bmQKPiAgICAgS2VybmVsIHBhbmljIC0gbm90IHN5bmNpbmc6IEF0dGVtcHRlZCB0 byBraWxsIGluaXQhIGV4aXRjb2RlPTB4MDAwMDdmMDAKPiAgICAgQ1BVOiAwIFBJRDogMSBDb21t OiBpbml0IE5vdCB0YWludGVkCj4gNS4xNC4wLXJjMi1vcmFuZ2VjcmFiLTAxOTMzLWc1Yzk1NzQ4 NjkwMTcgIzM1Nwo+ICAgICBDYWxsIFRyYWNlOgo+ICAgICBVbmFibGUgdG8gaGFuZGxlIGtlcm5l bCBOVUxMIHBvaW50ZXIgZGVyZWZlcmVuY2UgYXQgdmlydHVhbCBhZGRyZXNzIDAwMDAwYWYwCj4g ICAgIE9vcHMgWyMxXQo+ICAgICBDUFU6IDAgUElEOiAxIENvbW06IGluaXQgTm90IHRhaW50ZWQK PiA1LjE0LjAtcmMyLW9yYW5nZWNyYWItMDE5MzMtZzVjOTU3NDg2OTAxNyAjMzU3Cj4gICAgIGVw YyA6IHdhbGtfc3RhY2tmcmFtZSsweDExYy8weDEzYwo+ICAgICAgcmEgOiBkdW1wX2JhY2t0cmFj ZSsweDJjLzB4M2MKPiAgICAgZXBjIDogYzAwMDM5NzAgcmEgOiBjMDAwMzliYyBzcCA6IGMxODM1 ZTIwCj4gICAgICBncCA6IGMwNmE3NjkwIHRwIDogYzE4MzgwMDAgdDAgOiAwMDAwMDAwMAo+ICAg ICAgdDEgOiAwMDAwMDAwMCB0MiA6IDAwMDAwMDAwIHMwIDogYzE4MzVlNTAKPiAgICAgIHMxIDog YzA1ZDgxODAgYTAgOiAwMDAwMTAwMCBhMSA6IDAwMDAwMDAwCj4gICAgICBhMiA6IGMwNGRmZDY4 IGEzIDogYzA1ZDgxODAgYTQgOiBhYjFkNGNkYwo+ICAgICAgYTUgOiAwMDAwMTAwMCBhNiA6IGMw NjdkMjA0IGE3IDogZmZmZmVmZmYKPiAgICAgIHMyIDogMDAwMDAwMDAgczMgOiBjMDVjYzlmNCBz NCA6IDAwMDAwMDAwCj4gICAgICBzNSA6IGMwNWQ4MTgwIHM2IDogYzA0ZGZkNjggczcgOiAwMDAw MDAwMQo+ICAgICAgczggOiAwMDAwMDAwMCBzOSA6IDk1YjZmMTU4IHMxMDogMDAwMDAwMDAKPiAg ICAgIHMxMTogMDAwMDAwMDEgdDMgOiAwMDAwMDAwMCB0NCA6IDAwMDAwMDAxCj4gICAgICB0NSA6 IDAwMDAwMDAwIHQ2IDogMDAwMDAwMDAKPiAgICAgc3RhdHVzOiAwMDAwMDEwMCBiYWRhZGRyOiAw MDAwMGFmMCBjYXVzZTogMDAwMDAwMGQKPiAgICAgWzxjMDAwMzk3MD5dIHdhbGtfc3RhY2tmcmFt ZSsweDExYy8weDEzYwo+ICAgICBbPGMwMDAzOWJjPl0gZHVtcF9iYWNrdHJhY2UrMHgyYy8weDNj Cj4gICAgIFs8YzA0ZGZkZTg+XSBzaG93X3N0YWNrKzB4NDQvMHg1Ywo+ICAgICBbPGMwNGU0Yzk4 Pl0gZHVtcF9zdGFja19sdmwrMHgyYy8weDQwCj4gICAgIFs8YzA0ZTRjYzg+XSBkdW1wX3N0YWNr KzB4MWMvMHgyYwo+ICAgICBbPGMwNGRmZjNjPl0gcGFuaWMrMHgxM2MvMHgzMzAKPiAgICAgWzxj MDAwYzc3ND5dIGRvX2V4aXQrMHg4MzAvMHg4YjgKPiAgICAgWzxjMDAwYzg4OD5dIGRvX2dyb3Vw X2V4aXQrMHg0MC8weGFjCj4gICAgIFs8YzAwMGM5MTg+XSBfX3dha2VfdXBfcGFyZW50KzB4MC8w eDM0Cj4gICAgIFs8YzAwMDIxMjg+XSByZXRfZnJvbV9zeXNjYWxsKzB4MC8weDQKPiAgICAgLS0t WyBlbmQgdHJhY2UgZDE0N2YwZjE0Njk4MmIwOCBdLS0tCj4gICAgIG5vdGU6IGluaXRbMV0gZXhp dGVkIHdpdGggcHJlZW1wdF9jb3VudCAxCj4gICAgIEZpeGluZyByZWN1cnNpdmUgZmF1bHQgYnV0 IHJlYm9vdCBpcyBuZWVkZWQhCj4gCj4gR3J7b2V0amUsZWV0aW5nfXMsCj4gCj4gICAgICAgICAg ICAgICAgICAgICAgICAgR2VlcnQKPiAKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0 cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGlu Zm8vbGludXgtcmlzY3YK