From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fra-out-010.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-010.esa.eu-central-1.outbound.mail-perimeter.amazon.com [63.178.143.178]) (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 890582FB969; Fri, 19 Sep 2025 10:21:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=63.178.143.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277286; cv=none; b=EONx8r+AJoYf12xAhWWwMZbRFgApUL4YqzCSxDVSf5+4BUIhUbdv0stniCJpaqR0q5FylPtxiabe3PVXNQlZmBNC9LYpJZqtSziVfwoXBSscVdOGL5QSDtu8ekgOMqUf7JijaEGOt6s0HbEEtvYTQueL6FTqmrdu4uoG8VkAboY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277286; c=relaxed/simple; bh=ILpJK0cxFlaCBTXrjsnI7Vlg2CWLBAQ6lPEnAtvzy+g=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Du86XGjioaIGAAFHPFBsJ0pJzhK9GZiQo3Q8wDi9iA4asid5Rvjz+FVxwTnRIGfmbfDRqHtBUzGocP0ZC7BXouiQapR5B1pcxS2EVJmS2wl59M8gyuabXB3KOkyJTLypTArCOgQdPAPfNer57D7SyfDQMR8bVFhOovtIYERB/AM= 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=Ji+c9I5F; arc=none smtp.client-ip=63.178.143.178 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="Ji+c9I5F" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1758277284; x=1789813284; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jAlxXvtF6wZ1RF0/zktk6f5ZtKHAgPghtBG8hJeCJz4=; b=Ji+c9I5FFgfGgPEa306QUV45wpS4lQKm9jh+M2SYYCxFcVeioisUw3TH 8OCbOFVZXCN37LaHbIgQKc+y0/bsMB67YVcPGrXqXA/JfJ1zOvVvJMhsV HrsVWk0PSB2b6J/uojx6soIeaSHQ/S2g5bBh0AmaIWOHx6/fiyYPXiScW iMAD5Amo6OZ8TRwi9VP3b3nIDivE3Lzo90ELIWighsniFIWC0U+ARqVJ0 Q5jvpfm65AV3Xgm5zWxz/U/ElcsxJTyx4CeqqhPBF//1KMG8TDntTFSNU M0+V6rnRRXX6daoWK56lW0MffttojF2EGH322ZCoLalBauOYUlHb7/73T g==; X-CSE-ConnectionGUID: 9PQmffjpTFKSiqWLn5sVCw== X-CSE-MsgGUID: 0Ga1lrCYS1OZrMj5GbzyPw== X-IronPort-AV: E=Sophos;i="6.18,277,1751241600"; d="scan'208";a="2262984" Received: from ip-10-6-6-97.eu-central-1.compute.internal (HELO smtpout.naws.eu-central-1.prod.farcaster.email.amazon.dev) ([10.6.6.97]) by internal-fra-out-010.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2025 10:21:13 +0000 Received: from EX19MTAEUC002.ant.amazon.com [54.240.197.228:24821] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.30.197:2525] with esmtp (Farcaster) id 2ca2afb6-28f8-48e1-be6d-282feb564393; Fri, 19 Sep 2025 10:21:13 +0000 (UTC) X-Farcaster-Flow-ID: 2ca2afb6-28f8-48e1-be6d-282feb564393 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: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D045UWA004.ant.amazon.com (10.13.139.91) To EX19D018EUA004.ant.amazon.com (10.252.50.85) 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@bootlin.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), >) +/* + * Remove a const qualifier from integer types + * _Generic(foo, type-name: association, ..., default: association) performs 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 pointer, + * __must_be_array() will return a failure. + * --- 8< --- + * int *buff + * ... + * min = min_array(buff, nb_items); + * --- 8< --- + * + * The first typeof(&(array)[0]) is needed in order to support arrays of both + * '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 order + * to discard the const qualifier for the __element variable. + */ +#define __minmax_array(op, array, len) ({ \ + typeof(&(array)[0]) __array = (array); \ + typeof(len) __len = (len); \ + __unconst_integer_typeof(__array[0]) __element = __array[--__len]; \ + while (__len--) \ + __element = 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 -- 2.47.3