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[106.72.41.33]) by smtp.gmail.com with ESMTPSA id gb10sm20161764pjb.43.2021.07.19.07.49.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Jul 2021 07:49:57 -0700 (PDT) Subject: Re: [PATCH v4 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall To: Guenter Roeck , Palmer Dabbelt , Geert Uytterhoeven , Qiu Wenbo , Paul Walmsley , Albert Ou , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org References: <5e1b5d90-5a1e-5e9f-7b92-6c53b8589c2a@gmail.com> <9a2bf544-2aaa-d175-bc0a-c8bcefd8141a@roeck-us.net> From: Akira Tsukamoto Message-ID: <718c5a83-de9f-3b5a-ef36-e52ad5bb4d67@gmail.com> Date: Mon, 19 Jul 2021 23:49:53 +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: <9a2bf544-2aaa-d175-bc0a-c8bcefd8141a@roeck-us.net> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210719_074959_192433_06064708 X-CRM114-Status: GOOD ( 21.27 ) 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 Ck9uIDcvMTkvMjAyMSAxMToyNCBQTSwgR3VlbnRlciBSb2VjayB3cm90ZToKPiBPbiA3LzE5LzIx IDc6MDAgQU0sIEFraXJhIFRzdWthbW90byB3cm90ZToKPj4KPj4gT24gNy8xOS8yMDIxIDEwOjUx IFBNLCBHdWVudGVyIFJvZWNrIHdyb3RlOgo+Pj4gSGksCj4+Pgo+Pj4gT24gNy8xOS8yMSA1OjUz IEFNLCBBa2lyYSBUc3VrYW1vdG8gd3JvdGU6Cj4+Pj4KPj4+PiBUaGlzIHBhdGNoIHdpbGwgcmVk dWNlIGNwdSB1c2FnZSBkcmFtYXRpY2FsbHkgaW4ga2VybmVsIHNwYWNlIGVzcGVjaWFsbHkKPj4+ PiBmb3IgYXBwbGljYXRpb24gd2hpY2ggdXNlIHN5cy1jYWxsIHdpdGggbGFyZ2UgYnVmZmVyIHNp emUsIHN1Y2ggYXMKPj4+PiBuZXR3b3JrIGFwcGxpY2F0aW9ucy4gVGhlIG1haW4gcmVhc29uIGJl aGluZCB0aGlzIGlzIHRoYXQgZXZlcnkKPj4+PiB1bmFsaWduZWQgbWVtb3J5IGFjY2VzcyB3aWxs IHJhaXNlIGV4Y2VwdGlvbnMgYW5kIHN3aXRjaCBiZXR3ZWVuIHMtbW9kZQo+Pj4+IGFuZCBtLW1v ZGUgY2F1c2luZyBsYXJnZSBvdmVyaGVhZC4KPj4+Pgo+Pj4KPj4+IEkgaGFkIHRvIHJldmVydCB0 aGUgb3JpZ2luYWwgcGF0Y2ggZnJvbSB0aGUgbWFpbmxpbmUga2VybmVsIHByaW9yIHRvIGFwcGx5 aW5nCj4+PiB0aGlzIHBhdGNoLiBPYnZpb3VzbHkgdGhhdCBtZWFucyB0aGF0IHRoZXJlIG1heSBi ZSBvdGhlciBjaGFuZ2VzIGFmZmVjdGluZyB0aGUKPj4+IG91dGNvbWUuCj4+Pgo+Pj4gcmlzY3Y2 NCBpbWFnZXMgd29yaywgYnV0IHJpc2N2MzIgaW1hZ2VzIHN0aWxsIGZhaWwgd2l0aCB0aGlzIHBh dGNoIGFwcGxpZWQuCj4+PiBUaGUgZXJyb3IgaXMgYSBiaXQgZGlmZmVyZW50IHRoYW4gYmVmb3Jl LCB0aG91Z2guCj4+Pgo+Pj4gLi4uCj4+PiBbwqDCoCAxMS44OTk5NzldIFJ1biAvc2Jpbi9pbml0 IGFzIGluaXQgcHJvY2Vzcwo+Pj4gW8KgwqAgMTIuMTUyNjY2XSByYW5kb206IGZhc3QgaW5pdCBk b25lCj4+PiBtb3VuOiBhcHBsZXQgbm90IGZvdW5kCj4+PiAi77+977+977+977+977+9Vu+/vXQ6 IGFwcGxldCBub3QgZm91bmQKPj4+IC9iae+/ve+/ve+/ve+/ve+/vVbvv71GLTogYXBwbGV0IG5v dCBmb3VuZAo+Pj4gbW91bjogYXBwbGV0IG5vdCBmb3VuZAo+Pj4gc3dhb246IGFwcGxldCBub3Qg Zm91bmQKPj4+IGhvc3RuYW1lLUY6IGFwcGxldCBub3QgZm91bmQKPj4+Cj4+PiBBZnRlciB0aGlz LCB0aGUgaW1hZ2UgaGFuZ3MuCj4+Pgo+Pj4gRm9yIGNvbXBhcmlzb24sIHRoZSBtYWlubGluZSBr ZXJuZWwgKHY1LjE0LXJjMikgZmFpbHMgYXMgZm9sbG93cy4KPj4+Cj4+PiBbwqDCoCAxMC43ODgx MDVdIFJ1biAvc2Jpbi9pbml0IGFzIGluaXQgcHJvY2Vzcwo+Pj4gU3RhcnRpbmcgc3lzbG9nZDog T0sKPj4+IFN0YXJ0aW5nIGtsb2dkOiBPSwo+Pj4gL2V0Yy9pbml0LmQvUzAyc3lzY3RsOiBsaW5l IDY4OiBzeW50YXggZXJyb3I6IEVPRiBpbiBiYWNrcXVvdGUgc3Vic3RpdHV0aW9uCj4+PiAvZXRj L2luaXQuZC9TMjB1cmFuZG9tOiBsaW5lIDE6IHN5bnRheCBlcnJvcjogdW50ZXJtaW5hdGVkIHF1 b3RlZCBzdHJpbmcKPj4+IFN0YXJ0aW5nIG5ldHdvcms6IC9iaW4vc2g6IHN5bnRheCBlcnJvcjog dW50ZXJtaW5hdGVkIHF1b3RlZCBzdHJpbmcKPj4+IHNlZDogdW5tYXRjaGVkICcvJwo+Pj4gL2Jp bi9zaDogc3ludGF4IGVycm9yOiB1bnRlcm1pbmF0ZWQgcXVvdGVkIHN0cmluZwo+Pj4gRkFJTAo+ Pj4gL2V0Yy9pbml0LmQvUzU1cnVudGVzdDogbGluZSA0ODogc3ludGF4IGVycm9yOiBFT0YgaW4g YmFja3F1b3RlIHN1YnN0aXR1dGlvbgo+Pj4KPj4+IEknbGwgYmUgaGFwcHkgdG8gcHJvdmlkZSBp bmZvcm1hdGlvbiBvbiBob3cgdG8gcmVwcm9kdWNlIHRoZSBwcm9ibGVtCj4+PiBpZiBuZWVkZWQu IFBsZWFzZSBsZXQgbWUga25vdy4KPj4KPj4gWWVzLCBJIGRvIHdvdWxkIGxpa2UgdG8ga25vdyB0 aGUgcHJvY2VkdXJlIG9mIGJ1aWxkIGluc3RydWN0aW9uIG9mIHlvdXIgcnYzMiBpbWFnZS4KPj4g VGhlbiBJIHdvdWxkIHJlcHJvZHVjZSB0aGUgZXJyb3IgYW5kIGxvb2sgaW50byBob3cgdG8gZml4 IGl0Lgo+Pgo+IFBsZWFzZSBoYXZlIGEgbG9vayBhdCBodHRwOi8vc2VydmVyLnJvZWNrLXVzLm5l dC9xZW11L3Jpc2N2MzIvCj4gYW5kIGxldCBtZSBrbm93IGlmIHlvdSBuZWVkIGFueXRoaW5nIGVs c2UuCgpUaGFua3MgZm9yIHRoZSBsaW5rLiBJIHdpbGwgd29yayBvbiBpdCB0b21vcnJvdyBpbiBt eSB0aW1lLgpCdWlsZGluZyB0aGUga2VybmVsIHdpdGggZGVmY29uZmlnIGxvb2tzIG11Y2ggcXVp Y2tlciB0aGFuIHRoZSBjb25maWcuCkkgd2lsbCB0cnkgaXQgZnJvbSBkZWZjb25maWcgYW5kIHRo ZW4gY29uZmlnLgoKQWxzbyBJIHdvdWxkIGxpa2UgdG8gdXNlIHRoZSBzYW1lIHJ2MzIgdG9vbGNo YWluLiBBcmUgeW91IHVzaW5nIHByZWJ1aWx0CnJpc2N2MzItbGludXgtZ2NjPyBTaG91bGQgbm90 IG1ha2UgZGlmZmVyZW5jZXMgYnV0IGp1c3QgaW4gY2FzZS4KCklzIHRoZXJlIGEgcHVibGljIHJl ZmVyZW5jZSBmb3IgdGhlIHdheSBvZiBidWlsZGluZyB5b3VyIHFlbXUgYW5kIG9wZW5zYmk/Ck5v dCBzdXJlIHdoaWNoIHZlcnNpb24gb2YgcWVtdSB3aXRoIHdoaWNoIHJ2MzIgdG8gYnVpbGQgdGhl bSwgcnYzMmksIHJ2MzJpbWFkIG9yIGVsc2UuCgpJIHJlYWxseSBhcHByZWNpYXRlIHlvdXIgaGVs cC4KCkFraXJhCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f XwpsaW51eC1yaXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9y ZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2 Cg==