Re: [PATCH] riscv: uaccess: Add a fast path for small aligned copies
yunhui cui <[email protected]> Wed, 5 Aug 2026 11:48:54 +0800
| Newsgroups | org.infradead.lists.linux-riscv,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <CAEEQ3wkOOLbFrRRyvLtJdwLFfmTOHdacX3zX0b-=vzipwsJcbg@mail.gmail.com> |
SGkgUGF1bCwKCk9uIFR1ZSwgSnVuIDIzLCAyMDI2IGF0IDQ6MzbigK9QTSBZdW5odWkgQ3VpIDxj dWl5dW5odWlAYnl0ZWRhbmNlLmNvbT4gd3JvdGU6Cj4KPiBUaGUgc2NhbGFyIHVzZXIgY29weSBy b3V0aW5lIGN1cnJlbnRseSBlbnRlcnMgdGhlIHdvcmQtY29weSBwYXRoIG9ubHkKPiBmb3IgY29w aWVzIG9mIGF0IGxlYXN0IDkgKiBTWlJFRyAtIDEgYnl0ZXMuIE9uIFJWNjQgdGhpcyBpcyA3MSBi eXRlcywKPiBzbyBjb21tb24gMzItYnl0ZSBhbmQgNjQtYnl0ZSBhbGlnbmVkIHVzZXIva2VybmVs IGNvcGllcyBmYWxsIGJhY2sgdG8KPiBieXRlLWJ5LWJ5dGUgY29weWluZy4KPgo+IEFkZCBhIHNt YWxsLWNvcHkgd29yZCBwYXRoIGZvciBjb3BpZXMgYmVsb3cgdGhhdCB0aHJlc2hvbGQgd2hlbiBi b3RoCj4gc291cmNlIGFuZCBkZXN0aW5hdGlvbiBhcmUgU1pSRUctYWxpZ25lZC4gVW5hbGlnbmVk IGFuZCBzdWItd29yZCBjb3BpZXMKPiBrZWVwIHVzaW5nIHRoZSBleGlzdGluZyBieXRlLWNvcHkg cGF0aCwgYW5kIGxhcmdlciBjb3BpZXMga2VlcCB1c2luZyB0aGUKPiBleGlzdGluZyBsYXJnZS1j b3B5IHBhdGhzLgo+Cj4gVGhpcyBpcyBhIGdlbmVyaWMgdXNlcmNvcHkgaW1wcm92ZW1lbnQuIE9u ZSBjb21tb24gY2FzZSBpcyBMaW51eCBBSU86Cj4gaW9fZ2V0ZXZlbnRzKCkgY29waWVzIDMyLWJ5 dGUgc3RydWN0IGlvX2V2ZW50IG9iamVjdHMgdG8gdXNlcnNwYWNlLCBhbmQKPiBpb19zdWJtaXQo KSBjb3BpZXMgNjQtYnl0ZSBzdHJ1Y3QgaW9jYiBvYmplY3RzIGZyb20gdXNlcnNwYWNlLgo+Cj4g ZmlvIGxpYmFpbyByYW5kcncgdGhyZWUtcnVuIGF2ZXJhZ2VzIGltcHJvdmVkOgo+Cj4gICBiYXNl bGluZTogICByZWFkIDU2MGsgSU9QUywgd3JpdGUgMjQwayBJT1BTLCBzeXMgNjguNjAlCj4gICB0 aGlzIHBhdGNoOiByZWFkIDU5M2sgSU9QUywgd3JpdGUgMjU0ayBJT1BTLCBzeXMgNjkuMDMlCj4K PiBUaGlzIGlzIGFib3V0ICs1LjglIHJlYWQgSU9QUyBhbmQgKzUuNSUgd3JpdGUgSU9QUy4KPgo+ IGxtYmVuY2ggYndfcGlwZSB3aXRoIHNtYWxsIG1lc3NhZ2VzIHdhcyBhbHNvIGltcHJvdmVkOgo+ Cj4gICBid19waXBlIC1tIDxzaXplPiAtTSAxNm0gLVcgMSAtTiA1Cj4KPiAgIHNpemUgICBiYXNl bGluZSBNQi9zICAgdGhpcyBwYXRjaCBNQi9zICAgY2hhbmdlCj4gICAgMzIgICAgICAgNjIuNTIg ICAgICAgICAgICA3NC41NCAgICAgICAgICsxOS4yJQo+ICAgIDY0ICAgICAgMTIyLjU3ICAgICAg ICAgICAxNTUuMzEgICAgICAgICArMjYuNyUKPgo+IFNpZ25lZC1vZmYtYnk6IFl1bmh1aSBDdWkg PGN1aXl1bmh1aUBieXRlZGFuY2UuY29tPgo+IC0tLQo+ICBhcmNoL3Jpc2N2L2xpYi91YWNjZXNz LlMgfCAxOSArKysrKysrKysrKysrKysrKy0tCj4gIDEgZmlsZSBjaGFuZ2VkLCAxNyBpbnNlcnRp b25zKCspLCAyIGRlbGV0aW9ucygtKQo+Cj4gZGlmZiAtLWdpdCBhL2FyY2gvcmlzY3YvbGliL3Vh Y2Nlc3MuUyBiL2FyY2gvcmlzY3YvbGliL3VhY2Nlc3MuUwo+IGluZGV4IDRlZmVhMWIzMzI2Yzgu LjJkNzgwMDdmMTBkMDEgMTAwNjQ0Cj4gLS0tIGEvYXJjaC9yaXNjdi9saWIvdWFjY2Vzcy5TCj4g KysrIGIvYXJjaC9yaXNjdi9saWIvdWFjY2Vzcy5TCj4gQEAgLTcwLDEyICs3MCwyNyBAQCBTWU1f RlVOQ19TVEFSVChmYWxsYmFja19zY2FsYXJfdXNlcmNvcHlfc3VtX2VuYWJsZWQpCj4gICAgICAg ICBhZGQgICAgIHQwLCBhMCwgYTIKPgo+ICAgICAgICAgLyoKPiAtICAgICAgICAqIFVzZSBieXRl IGNvcHkgb25seSBpZiB0b28gc21hbGwuCj4gLSAgICAgICAgKiBTWlJFRyBob2xkcyA0IGZvciBS VjMyIGFuZCA4IGZvciBSVjY0Cj4gKyAgICAgICAgKiBGb3Igc21hbGwgY29waWVzIGJlbG93IHRo ZSBsYXJnZS1jb3B5IHRocmVzaG9sZCwgdXNlIHdvcmQtY29weSBpZgo+ICsgICAgICAgICogYm90 aCBzcmMgYW5kIGRzdCBhcmUgbmF0dXJhbGx5IGFsaWduZWQuIFVuYWxpZ25lZCBvciBzdWItd29y ZCBjb3BpZXMKPiArICAgICAgICAqIGFyZSBsZWZ0IHRvIHRoZSBieXRlLWNvcHkgdGFpbC4KPiAg ICAgICAgICAqLwo+ICAgICAgICAgbGkgICAgICBhMywgOSpTWlJFRy0xIC8qIHNpemUgbXVzdCA+ PSAod29yZF9jb3B5IHN0cmlkZSArIFNaUkVHLTEpICovCj4gKyAgICAgICBiZ2V1ICAgIGEyLCBh MywgLkxsYXJnZV9jb3B5X3VzZXIKPiArICAgICAgIGxpICAgICAgYTMsIFNaUkVHCj4gICAgICAg ICBibHR1ICAgIGEyLCBhMywgLkxieXRlX2NvcHlfdGFpbAo+ICsgICAgICAgb3IgICAgICBhMywg YTAsIGExCj4gKyAgICAgICBhbmRpICAgIGEzLCBhMywgU1pSRUctMQo+ICsgICAgICAgYm5leiAg ICBhMywgLkxieXRlX2NvcHlfdGFpbAo+ICsgICAgICAgYW5kaSAgICB0MSwgdDAsIH4oU1pSRUct MSkKPiArNToKPiArICAgICAgIGZpeHVwIFJFR19MICAgYTUsIDAoYTEpLCAxMGYKPiArICAgICAg IGFkZGkgICAgYTEsIGExLCBTWlJFRwo+ICsgICAgICAgZml4dXAgUkVHX1MgICBhNSwgMChhMCks IDEwZgo+ICsgICAgICAgYWRkaSAgICBhMCwgYTAsIFNaUkVHCj4gKyAgICAgICBibHR1ICAgIGEw LCB0MSwgNWIKPiArICAgICAgIGogICAgICAgLkxieXRlX2NvcHlfdGFpbAo+Cj4gKy5MbGFyZ2Vf Y29weV91c2VyOgo+ICAgICAgICAgLyoKPiAgICAgICAgICAqIENvcHkgZmlyc3QgYnl0ZXMgdW50 aWwgZHN0IGlzIGFsaWduZWQgdG8gd29yZCBib3VuZGFyeS4KPiAgICAgICAgICAqIGEwIC0gc3Rh cnQgb2YgZHN0Cj4gLS0KPiAyLjM5LjUKPgoKQ291bGQgeW91IHBsZWFzZSBoZWxwIGNvbmZpcm0g d2hldGhlciB0aGlzIHBhdGNoIGNhbiBiZSBtZXJnZWQ/CgpUaGFua3PvvIwKWXVuaHVpCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBt YWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMu aW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==