From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7BD801BC5C for ; Sun, 5 May 2024 13:39:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.58.85.151 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714916367; cv=none; b=nytIR/tDgJHTE4hMKiUo/KDBd/xUpYo+8Rj1aqFY/duBxZoxJEvkWkHa9ZzympjWoGjNAXF7UeKEw3sDhnXYYQx7E4JjQJXVeVekk2BUWBTwp6KvCN6GVtLKNy84uECNSgUXAkRCB9W/g6qLO8O0+YCTKHH5Q7UPgXGyNP/hnqA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714916367; c=relaxed/simple; bh=MGNVhHHDkYMXHSgTk7UxWt8BeGW9WOX4CbqGNRY3E0k=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: MIME-Version:Content-Type; b=oM/1bVdcJjmWokMACzanwusYvOxzQTiS5ZiYoREj/zDWf1oOhAOu35UejRPN5kynFnLCR1PJ5KceWmxBEHv37eQq9oZ10z4WP0iSXqw52t/TgWPkiIN5plePoHdFxPzWQVJ2YLuuG90IEl3IP4SpEJfBdI3MgV6jmshvuu+BY10= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM; spf=pass smtp.mailfrom=aculab.com; arc=none smtp.client-ip=185.58.85.151 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aculab.com Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-124-vwaktAuzPpq_9ysQnuYoWQ-1; Sun, 05 May 2024 14:39:22 +0100 X-MC-Unique: vwaktAuzPpq_9ysQnuYoWQ-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Sun, 5 May 2024 14:38:48 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Sun, 5 May 2024 14:38:48 +0100 From: David Laight To: 'Kees Cook' , Andy Shevchenko CC: Hsin-Yu.Chen , "andy@kernel.org" , "akpm@linux-foundation.org" , "linux-hardening@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH 2/2] string: improve strlen performance Thread-Topic: [PATCH 2/2] string: improve strlen performance Thread-Index: AQHanKLZPFuACoaESk2KpN/2ErXiirGIqNYw Date: Sun, 5 May 2024 13:38:48 +0000 Message-ID: <7c1565516531425c8f7cf5ffd5582741@AcuMS.aculab.com> References: <20240502141359.89567-1-harry021633@gmail.com> <202405020809.C8973634BF@keescook> In-Reply-To: <202405020809.C8973634BF@keescook> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 RnJvbTogS2VlcyBDb29rDQo+IFNlbnQ6IDAyIE1heSAyMDI0IDE2OjExDQo+IA0KPiBPbiBUaHUs IE1heSAwMiwgMjAyNCBhdCAwNjowMzowNFBNICswMzAwLCBBbmR5IFNoZXZjaGVua28gd3JvdGU6 DQo+ID4gT24gVGh1LCBNYXkgMiwgMjAyNCBhdCA1OjU54oCvUE0gQW5keSBTaGV2Y2hlbmtvDQo+ ID4gPGFuZHkuc2hldmNoZW5rb0BnbWFpbC5jb20+IHdyb3RlOg0KPiA+ID4gT24gVGh1LCBNYXkg MiwgMjAyNCBhdCA1OjE04oCvUE0gSHNpbi1ZdS5DaGVuIDxoYXJyeTAyMTYzM0BnbWFpbC5jb20+ IHdyb3RlOg0KPiA+DQo+ID4gQW5kIG9uIHRvcCBvZiB0aGF0LCBjaGVjayB3aGF0IHRoaXMgY29k ZSB3aWxsIGRvIG9uIHRoZSBhcmNoaXRlY3R1cmVzDQo+ID4gdGhhdCBkbyBub3Qgc3VwcG9ydCB1 bmFsaWduZWQgYWNjZXNzLiBJZiBldmVyeXRoaW5nIGlzIGZpbmUsIG1lbnRpb24NCj4gPiB0aGlz IGluIHRoZSBjb21taXQgbWVzc2FnZS4gQnR3LCB5b3VyIGNvbW1pdCBtZXNzYWdlIG5lZWRzDQo+ ID4gZWxhYm9yYXRpb24sIGUuZy4sIHBvaW50aW5nIHRvIHRoZSB0ZXN0IGNhc2UgKHdoaWNoIGlz IGFic2VudCBpbiB0aGlzDQo+ID4gcGF0Y2gsIEkgYXNzdW1lIGl0J3MgYWxyZWFkeSBpbiB0aGUg a2VybmVsPykgYW5kIHN0ZXAtYnktc3RlcA0KPiA+IGluc3RydWN0aW9ucyBvbiBob3cgeW91IGdv dCB0aGUgbWVudGlvbmVkIHJlc3VsdHMgd2l0aCBkZXRhaWxzIG9mIHRoZQ0KPiA+IGhhcmR3YXJl IHlvdSB1c2VkIGZvciB0aGF0Lg0KPiANCj4gSSBtaWdodCBiZSB3b3J0aCBsb29raW5nIGF0IHRo ZSBpbXBsZW1lbnRhdGlvbiBvZiBzdHJzY3B5KCksIHdoaWNoIGlzDQo+IGRvaW5nIHNpbWlsYXIg bXVsdGktYnl0ZSBzdGVwcyBhbmQgaGFuZGxlcyB1bmFsaWduZWQgYWNjZXNzLg0KDQpBbmQgeDg2 IHJlYWxseSBkb2Vzbid0IGNhcmUgYWJvdXQgdW5hbGlnbmVkIGFjY2Vzc2VzIChmb3Igbm9ybWFs IHJlZ2lzdGVycykuDQpCdXQgaXQgaXMgaW1wb3J0YW50IHRvIG5vdCBhY2NpZGVudGFsbHkgcnVu IG9mZiB0aGUgZW5kIG9mIGEgcGFnZS4NCg0KVGhlcmUgaXMgYWxzbyB0aGUgd2hvbGUgcXVlc3Rp b24gb2YgdGhlIHR5cGljYWwgc3RyaW5nIGxlbmd0aC4NCkZvciBzaG9ydCBzdHJpbmdzIHlvdSd2 ZSBhbHJlYWR5IGxvc3QgYnkgdGhlIHRpbWUgeW91J3ZlIGFsaWduZWQNCnRoZSBhZGRyZXNzLg0K DQpPbiAzMmJpdCB0aGUgd2hvbGUgYml0LXR3aWRkbGluZyBtYXkgbm90IGJlIHdvcnRoIGl0IGF0 IGFsbC4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxl eSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0 aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==