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[106.72.41.33]) by smtp.gmail.com with ESMTPSA id u21sm4937658pfh.163.2021.07.14.23.20.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jul 2021 23:20:05 -0700 (PDT) Cc: akira.tsukamoto@gmail.com, Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv , Linux Kernel Mailing List Subject: Re: [PATCH v3 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall To: Geert Uytterhoeven , Guenter Roeck References: <3e1dbea4-3b0f-de32-5447-2e23c6d4652a@gmail.com> <60c1f087-1e8b-8f22-7d25-86f5f3dcee3f@gmail.com> <20210710014915.GA149706@roeck-us.net> From: Akira Tsukamoto Message-ID: Date: Thu, 15 Jul 2021 15:20:03 +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-20210714_232009_478415_BF0AF8A8 X-CRM114-Status: GOOD ( 20.65 ) 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 CgpPbiA3LzE0LzIwMjEgMzoxMCBBTSwgR2VlcnQgVXl0dGVyaG9ldmVuIHdyb3RlOgo+IEhpIEfD vG50ZXIsIFRzdWthbW90by1zYW4sCj4gCj4gT24gU2F0LCBKdWwgMTAsIDIwMjEgYXQgMzo1MCBB TSBHdWVudGVyIFJvZWNrIDxsaW51eEByb2Vjay11cy5uZXQ+IHdyb3RlOgo+PiBPbiBXZWQsIEp1 biAyMywgMjAyMSBhdCAwOTo0MDozOVBNICswOTAwLCBBa2lyYSBUc3VrYW1vdG8gd3JvdGU6Cj4+ PiBUaGlzIHBhdGNoIHdpbGwgcmVkdWNlIGNwdSB1c2FnZSBkcmFtYXRpY2FsbHkgaW4ga2VybmVs IHNwYWNlIGVzcGVjaWFsbHkKPj4+IGZvciBhcHBsaWNhdGlvbiB3aGljaCB1c2Ugc3lzLWNhbGwg d2l0aCBsYXJnZSBidWZmZXIgc2l6ZSwgc3VjaCBhcyBuZXR3b3JrCj4+PiBhcHBsaWNhdGlvbnMu IFRoZSBtYWluIHJlYXNvbiBiZWhpbmQgdGhpcyBpcyB0aGF0IGV2ZXJ5IHVuYWxpZ25lZCBtZW1v cnkKPj4+IGFjY2VzcyB3aWxsIHJhaXNlIGV4Y2VwdGlvbnMgYW5kIHN3aXRjaCBiZXR3ZWVuIHMt bW9kZSBhbmQgbS1tb2RlIGNhdXNpbmcKPj4+IGxhcmdlIG92ZXJoZWFkLgo+Pj4KPj4+IEZpcnN0 IGNvcHkgaW4gYnl0ZXMgdW50aWwgcmVhY2hlcyB0aGUgZmlyc3Qgd29yZCBhbGlnbmVkIGJvdW5k YXJ5IGluCj4+PiBkZXN0aW5hdGlvbiBtZW1vcnkgYWRkcmVzcy4gVGhpcyBpcyB0aGUgcHJlcGFy YXRpb24gYmVmb3JlIHRoZSBidWxrCj4+PiBhbGlnbmVkIHdvcmQgY29weS4KPj4+Cj4+PiBUaGUg ZGVzdGluYXRpb24gYWRkcmVzcyBpcyBhbGlnbmVkIG5vdywgYnV0IG9mdGVudGltZXMgdGhlIHNv dXJjZSBhZGRyZXNzCj4+PiBpcyBub3QgaW4gYW4gYWxpZ25lZCBib3VuZGFyeS4gVG8gcmVkdWNl IHRoZSB1bmFsaWduZWQgbWVtb3J5IGFjY2VzcywgaXQKPj4+IHJlYWRzIHRoZSBkYXRhIGZyb20g c291cmNlIGluIGFsaWduZWQgYm91bmRhcmllcywgd2hpY2ggd2lsbCBjYXVzZSB0aGUKPj4+IGRh dGEgdG8gaGF2ZSBhbiBvZmZzZXQsIGFuZCB0aGVuIGNvbWJpbmVzIHRoZSBkYXRhIGluIHRoZSBu ZXh0IGl0ZXJhdGlvbgo+Pj4gYnkgZml4aW5nIG9mZnNldCB3aXRoIHNoaWZ0aW5nIGJlZm9yZSB3 cml0aW5nIHRvIGRlc3RpbmF0aW9uLiBUaGUgbWFqb3JpdHkKPj4+IG9mIHRoZSBpbXByb3Zpbmcg Y29weSBzcGVlZCBjb21lcyBmcm9tIHRoaXMgc2hpZnQgY29weS4KPj4+Cj4+PiBJbiB0aGUgbHVj a3kgc2l0dWF0aW9uIHRoYXQgdGhlIGJvdGggc291cmNlIGFuZCBkZXN0aW5hdGlvbiBhZGRyZXNz IGFyZSBvbgo+Pj4gdGhlIGFsaWduZWQgYm91bmRhcnksIHBlcmZvcm0gbG9hZCBhbmQgc3RvcmUg d2l0aCByZWdpc3RlciBzaXplIHRvIGNvcHkgdGhlCj4+PiBkYXRhLiBXaXRob3V0IHRoZSB1bnJv bGxpbmcsIGl0IHdpbGwgcmVkdWNlIHRoZSBzcGVlZCBzaW5jZSB0aGUgbmV4dCBzdG9yZQo+Pj4g aW5zdHJ1Y3Rpb24gZm9yIHRoZSBzYW1lIHJlZ2lzdGVyIHVzaW5nIGZyb20gdGhlIGxvYWQgd2ls bCBzdGFsbCB0aGUKPj4+IHBpcGVsaW5lLgo+Pj4KPj4+IEF0IGxhc3QsIGNvcHlpbmcgdGhlIHJl bWFpbmRlciBpbiBvbmUgYnl0ZSBhdCBhIHRpbWUuCj4+Pgo+Pj4gU2lnbmVkLW9mZi1ieTogQWtp cmEgVHN1a2Ftb3RvIDxha2lyYS50c3VrYW1vdG9AZ21haWwuY29tPgo+Pgo+PiBUaGlzIHBhdGNo IGNhdXNlcyBhbGwgcmlzY3YzMiBxZW11IGVtdWxhdGlvbnMgdG8gc3RhbGwgZHVyaW5nIGJvb3Qu Cj4+IFRoZSBsb2cgc3VnZ2VzdHMgdGhhdCBzb21ldGhpbmcgaW4ga2VybmVsL3VzZXIgY29tbXVu aWNhdGlvbiBtYXkgYmUgd3JvbmcuCj4+Cj4+IEJhZCBjYXNlOgo+Pgo+PiBTdGFydGluZyBzeXNs b2dkOiBPSwo+PiBTdGFydGluZyBrbG9nZDogT0sKPj4gL2V0Yy9pbml0LmQvUzAyc3lzY3RsOiBs aW5lIDY4OiBzeW50YXggZXJyb3I6IEVPRiBpbiBiYWNrcXVvdGUgc3Vic3RpdHV0aW9uCj4+IC9l dGMvaW5pdC5kL1MyMHVyYW5kb206IGxpbmUgMTogc3ludGF4IGVycm9yOiB1bnRlcm1pbmF0ZWQg cXVvdGVkIHN0cmluZwo+PiBTdGFydGluZyBuZXR3b3JrOiAvYmluL3NoOiBzeW50YXggZXJyb3I6 IHVudGVybWluYXRlZCBxdW90ZWQgc3RyaW5nCj4gCj4+ICMgZmlyc3QgYmFkIGNvbW1pdDogW2Nh NmVhYWEyMTBkZWVjMGU0MWNiZmMzODBiZjg5Y2YwNzkyMDM1NjldIHJpc2N2OiBfX2FzbV9jb3B5 X3RvLWZyb21fdXNlcjogT3B0aW1pemUgdW5hbGlnbmVkIG1lbW9yeSBhY2Nlc3MgYW5kIHBpcGVs aW5lIHN0YWxsCj4gCj4gU2FtZSBoZXJlIG9uIHZleHJpc2N2LiBCaXNlY3RlZCB0byB0aGUgc2Ft ZSBjb21taXQuCj4gCj4gVGhlIGFjdHVhbCBzY3JpcHRzIGxvb2sgZmluZSB3aGVuIHVzaW5nICJj YXQiLCBidXQgY29udGFpbiBzb21lIGdhcmJhZ2UKPiB3aGVuIGV4ZWN1dGluZyB0aGVtIHVzaW5n ICJzaCAtdiIuCj4gCj4gVHN1a2Ftb3RvLXNhbjogZ2xhbmNpbmcgYXQgdGhlIHBhdGNoOgo+IAo+ ICsgICAgICAgYWRkaSAgICBhMCwgYTAsIDgqU1pSRUcKPiArICAgICAgIGFkZGkgICAgYTEsIGEx LCA4KlNaUkVHCj4gCj4gSSB0aGluayB5b3UgZm9yZ290IGFib3V0IHJ2MzIsIHdoZXJlIHJlZ2lz dGVycyBjb3ZlciBvbmx5IDQKPiBieXRlcyBlYWNoPwoKVGhhbmtzIEfDvG50ZXIgYW5kIEdlZXJ0 IGZvciB0aGUgcG9pbnRpbmcgb3V0IHRoZSBlcnJvcnMuCkkgd2lsbCBzZW5kIHRoZSBmaXhlcywg cHJvYmFibHkgdGhpcyB3ZWVrZW5kLgoKQWtpcmEKCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNj dkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4v bGlzdGluZm8vbGludXgtcmlzY3YK