From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AABB1C001DE for ; Tue, 25 Jul 2023 10:01:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232296AbjGYKBH convert rfc822-to-8bit (ORCPT ); Tue, 25 Jul 2023 06:01:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233488AbjGYKA4 (ORCPT ); Tue, 25 Jul 2023 06:00:56 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 337F710E3 for ; Tue, 25 Jul 2023 03:00:49 -0700 (PDT) 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-SA4uouzBO965Nt6ACHgVHg-1; Tue, 25 Jul 2023 11:00:46 +0100 X-MC-Unique: SA4uouzBO965Nt6ACHgVHg-1 Received: from AcuMS.Aculab.com (10.202.163.6) by AcuMS.aculab.com (10.202.163.6) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Tue, 25 Jul 2023 11:00:45 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Tue, 25 Jul 2023 11:00:45 +0100 From: David Laight To: "linux-kernel@vger.kernel.org" , "'Andy Shevchenko'" , 'Andrew Morton' , "Matthew Wilcox (Oracle)" , Christoph Hellwig , "Jason A. Donenfeld" Subject: [PATCH next 1/5] minmax: Add min_unsigned(a, b) and max_unsigned(a, b) Thread-Topic: [PATCH next 1/5] minmax: Add min_unsigned(a, b) and max_unsigned(a, b) Thread-Index: Adm+2zJY+ejT7PjHQ52rHHfvsNPoKA== Date: Tue, 25 Jul 2023 10:00:45 +0000 Message-ID: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] 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: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These can be used when min()/max() errors a signed v unsigned compare when the signed value is known to be non-negative. Unlike min_t(some_unsigned_type, a, b) min_unsigned() will never mask off high bits if an inappropriate type is selected. Signed-off-by: David Laight --- include/linux/minmax.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/minmax.h b/include/linux/minmax.h index 396df1121bff..531860e9cc55 100644 --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -73,6 +73,23 @@ */ #define max(x, y) __careful_cmp(x, y, >) +/** + * min_unsigned - return minimum of two non-negative values + * Signed types are zero extended to match a larger unsigned type. + * @x: first value + * @y: second value + */ +#define min_unsigned(x, y) \ + __careful_cmp((x) + 0u + 0ul + 0ull, (y) + 0u + 0ul + 0ull, <) + +/** + * max_unsigned - return maximum of two non-negative values + * @x: first value + * @y: second value + */ +#define max_unsigned(x, y) \ + __careful_cmp((x) + 0u + 0ul + 0ull, (y) + 0u + 0ul + 0ull, >) + /** * min3 - return minimum of three values * @x: first value -- 2.17.1 - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)