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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 622F1CAC5B0 for ; Thu, 2 Oct 2025 20:49:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BD9B28E000E; Thu, 2 Oct 2025 16:49:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B8A768E0001; Thu, 2 Oct 2025 16:49:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A793E8E000E; Thu, 2 Oct 2025 16:49:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 925388E0001 for ; Thu, 2 Oct 2025 16:49:05 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 4830E44B27 for ; Thu, 2 Oct 2025 20:49:05 +0000 (UTC) X-FDA: 83954363850.06.EA78565 Received: from fra-out-014.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-014.esa.eu-central-1.outbound.mail-perimeter.amazon.com [18.199.210.3]) by imf10.hostedemail.com (Postfix) with ESMTP id E58BAC000E for ; Thu, 2 Oct 2025 20:49:02 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=amazon.com header.s=amazoncorp2 header.b=YSZswaoQ; spf=pass (imf10.hostedemail.com: domain of "prvs=363ba725c=farbere@amazon.com" designates 18.199.210.3 as permitted sender) smtp.mailfrom="prvs=363ba725c=farbere@amazon.com"; dmarc=pass (policy=quarantine) header.from=amazon.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1759438143; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=CCU0o8wSJQJX56U4+pnGKdTopFZ/0WcuCtYzGhhpTrQ=; b=syTmJleYf56C0L1ouhXqBsZ4OGllrD0hym7F8ZEAM2TczPxJS3JWOzSyQuYlLGX2yHR5GP EpTQcrRPxNGQeh7wTpr2XpoqH2H7Cn4PUhgUp7XqSI/62wnhkhAfJXbDG4hVFr050r+PBH XVs0ky+ObZuFxZ0o3qG82CQwLZyX+Zc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1759438143; a=rsa-sha256; cv=none; b=ErHZ06LbCEuh0JFozpITmX3L70mLKPyrQtJB5En5NMzRybMJigSPssa/jB3TadAoZIpd5d wZU/eyfKM2qKzMUWtUM8qgBGRkjcyVejac/ggN6mbOOdCAL2ptC2ahvhgOU9UkH172IuH4 Sjw8LvDh3TIGNcZwiwaM6edOWPDz1cw= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=amazon.com header.s=amazoncorp2 header.b=YSZswaoQ; spf=pass (imf10.hostedemail.com: domain of "prvs=363ba725c=farbere@amazon.com" designates 18.199.210.3 as permitted sender) smtp.mailfrom="prvs=363ba725c=farbere@amazon.com"; dmarc=pass (policy=quarantine) header.from=amazon.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1759438143; x=1790974143; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CCU0o8wSJQJX56U4+pnGKdTopFZ/0WcuCtYzGhhpTrQ=; b=YSZswaoQG6SQPyCPqsNHwwzPXgk4aNF8fcCyzKuz/XQWqFRXb4/wviQs PweVqKaoU3ry+f2iV2atrhlJMSirfOJ8XoP4tBq9JmbNsxQ4J80/vRpkN 135X8XdmkMlsTlc/6k3FR2GXDRKz3fOGwKomI0UfZwFBA2JyXHzGUknOC gqNE8IiUKebqT05YN21Ha9mtQWN2dlapQFRIdfEq/UTBZxucNkV/8wAgp LKbqxGbZwtjy0GAGyxKvCYqxaY/yUnat0w3Q98SzkA2l48OeMW3rrqhOf tt2GWaz3FGukEnXz3XWyrqqTUr+cT7YY8cBmIxCeAX+2tGCHO+pgk8pfi Q==; X-CSE-ConnectionGUID: YFe8jPo1QUeEW67O7ndAHA== X-CSE-MsgGUID: tTAQC90ERwGyVX6J55647A== X-IronPort-AV: E=Sophos;i="6.18,310,1751241600"; d="scan'208";a="2924497" 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-014.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2025 20:49:01 +0000 Received: from EX19MTAEUA001.ant.amazon.com [54.240.197.233:11827] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.40.83:2525] with esmtp (Farcaster) id 6508bead-2ec3-4a32-addc-2cd3f144bb5d; Thu, 2 Oct 2025 20:49:01 +0000 (UTC) X-Farcaster-Flow-ID: 6508bead-2ec3-4a32-addc-2cd3f144bb5d Received: from EX19D018EUA004.ant.amazon.com (10.252.50.85) by EX19MTAEUA001.ant.amazon.com (10.252.50.223) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Thu, 2 Oct 2025 20:48:55 +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; Thu, 2 Oct 2025 20:48:30 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Andy Shevchenko , Christophe Leroy Subject: [PATCH 02/19 5.15.y] minmax: Introduce {min,max}_array() Date: Thu, 2 Oct 2025 20:47:16 +0000 Message-ID: <20251002204733.35652-3-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251002204733.35652-1-farbere@amazon.com> References: <20251002204733.35652-1-farbere@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [172.19.116.181] X-ClientProxiedBy: EX19D035UWA004.ant.amazon.com (10.13.139.109) To EX19D018EUA004.ant.amazon.com (10.252.50.85) X-Stat-Signature: pz8bte9khteq4hi89fcs6sebi7dqjkuo X-Rspam-User: X-Rspamd-Queue-Id: E58BAC000E X-Rspamd-Server: rspam10 X-HE-Tag: 1759438142-339545 X-HE-Meta: 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 i37sZok7 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 pyWMlfap X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 d4bc394b449e..aac0b7d23768 100644 --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -168,6 +168,70 @@ */ #define max_t(type, x, y) __careful_cmp(max, (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