From nobody Thu Oct 2 09:19:23 2025 Received: from fra-out-003.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-003.esa.eu-central-1.outbound.mail-perimeter.amazon.com [3.72.182.33]) (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 AB3F52FB969; Fri, 19 Sep 2025 10:21:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=3.72.182.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277272; cv=none; b=ZVrXWpVBct1KbmrQHEE//UKWIP2VjXDsv0hHLRptJEAYX9/NlhK7JCkxE+4vTXVc6M/iLgojD8wHjZ5+ZtN3FJQCdRNOyzvlRoI/5LWWjADHINXQBowkqNhkdaW4gEd6yplzb2PXTFMfG6Jj2wDwLr0oAtPfdyhH9/o/tdC8M6E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277272; c=relaxed/simple; bh=ILpJK0cxFlaCBTXrjsnI7Vlg2CWLBAQ6lPEnAtvzy+g=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=OULCnP5PhB/WQLPF0T/nAfgS55F+T/yxm/oHRecaDyjh31PkSErP9Uwb1d1cI50j9EWEMbA4AKrWNjbsZ3b7Q1PuiBhlkvZGmgSvajFAwIZG3arithxwNHPf3cYw4ATKflY58d0ZrdOKHoyvcUV/iaNOR0z17fiequB32LskNeQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.com; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b=bjd6QN7z; arc=none smtp.client-ip=3.72.182.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b="bjd6QN7z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1758277270; x=1789813270; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jAlxXvtF6wZ1RF0/zktk6f5ZtKHAgPghtBG8hJeCJz4=; b=bjd6QN7zLSGvhiE/3c2i+xSKGXhUDyhL3UNnyeEd1C6QAXzSUATTE54L uh3/JWHVIgGez06WkTGhHgGLzpwyGTPtkgVPNI51rjQZGjLM4Hm4Beo8S uUZsZwH8zrMYwzUxzzAzCI/+Wpg5olG7bNVwQvQc5e2xV7D9WU2nccODY XgAhzDEqXp3Y6pSgGwTfn3ne/ypCJ7a1v1zMrbkcnuwKxPMRDRXhU/O76 T8trv6PxQTdKTYDJoE2zVdsqvdbihzqVrNEOW1G4NFZ4Dd5KkoaLg46LE qM5Zfu18KU6SttHCpnVfSNw0tFNcz0+WWAbypSsdvACVpTizWcSLLYnYZ g==; X-CSE-ConnectionGUID: Xk2rTTfFQEKfM7PvxCYyfg== X-CSE-MsgGUID: mUY6ldt3Qa+FMoyGEPvF1Q== X-IronPort-AV: E=Sophos;i="6.18,277,1751241600"; d="scan'208";a="2365643" Received: from ip-10-6-3-216.eu-central-1.compute.internal (HELO smtpout.naws.eu-central-1.prod.farcaster.email.amazon.dev) ([10.6.3.216]) by internal-fra-out-003.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2025 10:21:07 +0000 Received: from EX19MTAEUC002.ant.amazon.com [54.240.197.228:21528] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.23.64:2525] with esmtp (Farcaster) id 11e7158b-2694-464a-90a7-6c9e9f1a2abf; Fri, 19 Sep 2025 10:21:07 +0000 (UTC) X-Farcaster-Flow-ID: 11e7158b-2694-464a-90a7-6c9e9f1a2abf Received: from EX19D018EUA004.ant.amazon.com (10.252.50.85) by EX19MTAEUC002.ant.amazon.com (10.252.51.245) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Fri, 19 Sep 2025 10:21:00 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by EX19D018EUA004.ant.amazon.com (10.252.50.85) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Fri, 19 Sep 2025 10:20:32 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , Andy Shevchenko , Christophe Leroy Subject: [PATCH 05/27 5.10.y] minmax: Introduce {min,max}_array() Date: Fri, 19 Sep 2025 10:17:05 +0000 Message-ID: <20250919101727.16152-6-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250919101727.16152-1-farbere@amazon.com> References: <20250919101727.16152-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: EX19D045UWA004.ant.amazon.com (10.13.139.91) To EX19D018EUA004.ant.amazon.com (10.252.50.85) Content-Type: text/plain; charset="utf-8" From: Herve Codina [ Upstream commit c952c748c7a983a8bda9112984e6f2c1f6e441a5 ] Introduce min_array() (resp max_array()) in order to get the minimal (resp maximum) of values present in an array. Signed-off-by: Herve Codina Reviewed-by: Andy Shevchenko Reviewed-by: Christophe Leroy Link: https://lore.kernel.org/r/20230623085830.749991-8-herve.codina@bootli= n.com Signed-off-by: Mark Brown Signed-off-by: Eliav Farber --- include/linux/minmax.h | 64 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/include/linux/minmax.h b/include/linux/minmax.h index 7affadcb2a29..0e89c78810f6 100644 --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -151,6 +151,70 @@ */ #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >) =20 +/* + * Remove a const qualifier from integer types + * _Generic(foo, type-name: association, ..., default: association) perfor= ms a + * comparison against the foo type (not the qualified type). + * Do not use the const keyword in the type-name as it will not match the + * unqualified type of foo. + */ +#define __unconst_integer_type_cases(type) \ + unsigned type: (unsigned type)0, \ + signed type: (signed type)0 + +#define __unconst_integer_typeof(x) typeof( \ + _Generic((x), \ + char: (char)0, \ + __unconst_integer_type_cases(char), \ + __unconst_integer_type_cases(short), \ + __unconst_integer_type_cases(int), \ + __unconst_integer_type_cases(long), \ + __unconst_integer_type_cases(long long), \ + default: (x))) + +/* + * Do not check the array parameter using __must_be_array(). + * In the following legit use-case where the "array" passed is a simple po= inter, + * __must_be_array() will return a failure. + * --- 8< --- + * int *buff + * ... + * min =3D min_array(buff, nb_items); + * --- 8< --- + * + * The first typeof(&(array)[0]) is needed in order to support arrays of b= oth + * 'int *buff' and 'int buff[N]' types. + * + * The array can be an array of const items. + * typeof() keeps the const qualifier. Use __unconst_integer_typeof() in o= rder + * to discard the const qualifier for the __element variable. + */ +#define __minmax_array(op, array, len) ({ \ + typeof(&(array)[0]) __array =3D (array); \ + typeof(len) __len =3D (len); \ + __unconst_integer_typeof(__array[0]) __element =3D __array[--__len]; \ + while (__len--) \ + __element =3D op(__element, __array[__len]); \ + __element; }) + +/** + * min_array - return minimum of values present in an array + * @array: array + * @len: array length + * + * Note that @len must not be zero (empty array). + */ +#define min_array(array, len) __minmax_array(min, array, len) + +/** + * max_array - return maximum of values present in an array + * @array: array + * @len: array length + * + * Note that @len must not be zero (empty array). + */ +#define max_array(array, len) __minmax_array(max, array, len) + /** * clamp_t - return a value clamped to a given range using a given type * @type: the type of variable to use --=20 2.47.3