From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pdx-out-004.esa.us-west-2.outbound.mail-perimeter.amazon.com (pdx-out-004.esa.us-west-2.outbound.mail-perimeter.amazon.com [44.246.77.92]) (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 7E1802F49F0; Wed, 8 Oct 2025 15:30:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=44.246.77.92 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759937436; cv=none; b=jtH8d3zJ8RYkFsDXEk+ElVcEX+OcS+6xxpkrckA+Rop/mMwHOjNbDs5ENnZTaCWQpRALm3Qec3mp3eN7nnCurcsKh6C+010LwoTjOVz2VjvpYvST99vOrAdqAg+P9VNLy9bz55hfP8VNPJIpEh6ctlKDeNasvIuvgecj59tz2iw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759937436; c=relaxed/simple; bh=MPbFimTJUFx75fJugZt/UsCD1KUboxKM93LqL2VEi5M=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kOd3/gcfzlM/JDlpNYEP7Og2wHE4TurHv/BdumD1OT/6PvE1CxMEEnxJYcQ58ELKhaRmjYzZ42AHY0c3xBnX4KYGQ/vyjqUJNti6w/j6Hlpn1qiikv7Eo/SXIiMKiSrIVNjF+ec7n1G27LF0RJfq9pYSq8tycd8uw4vxYkuUNVA= 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=jCesbbYB; arc=none smtp.client-ip=44.246.77.92 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="jCesbbYB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1759937434; x=1791473434; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CCU0o8wSJQJX56U4+pnGKdTopFZ/0WcuCtYzGhhpTrQ=; b=jCesbbYBP6CWWBcIqXtWJ+69l7h21tZW8ZJ9IlxJeqEuDMJlrnFxoGM4 LvdX1eZ6DdawqD6f/0iso40wB+v0PhenQjzQmG8H/l42mJmpM0TcWRfG9 gT2fGl/IyXC89GOie7sMJ7lbmei/AmeFlZ/UlYuFUK9AYdD9FKvuJli43 m1rB2aKNvU0dMFyKhadRU1sFJuZNpRdY7LyDqEw3AO/ioBo5RLyiWdKFV Z0zBK9xMocbVHJ3wPU1ECsmuPatVQjKI6tDK2PNkuIMWXokBrCdlBneVx Fmi6e1qwIyzIwS6lBeQQQ8UBqCWsK1hXErwUsiQFn9lZxa39LwR4V4x7K w==; X-CSE-ConnectionGUID: FAdGmmW+T0+u0jQ2d4QeBQ== X-CSE-MsgGUID: X3yDuui9Sv2jpaN6sKHe0A== X-IronPort-AV: E=Sophos;i="6.19,213,1754956800"; d="scan'208";a="4533988" Received: from ip-10-5-9-48.us-west-2.compute.internal (HELO smtpout.naws.us-west-2.prod.farcaster.email.amazon.dev) ([10.5.9.48]) by internal-pdx-out-004.esa.us-west-2.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2025 15:30:32 +0000 Received: from EX19MTAUWB002.ant.amazon.com [10.0.21.151:27231] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.57.112:2525] with esmtp (Farcaster) id 01dd130f-bec0-4f9d-8bb2-391e29d56fcd; Wed, 8 Oct 2025 15:30:32 +0000 (UTC) X-Farcaster-Flow-ID: 01dd130f-bec0-4f9d-8bb2-391e29d56fcd Received: from EX19D001UWA001.ant.amazon.com (10.13.138.214) by EX19MTAUWB002.ant.amazon.com (10.250.64.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Wed, 8 Oct 2025 15:30:30 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by EX19D001UWA001.ant.amazon.com (10.13.138.214) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Wed, 8 Oct 2025 15:30:17 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Andy Shevchenko , Christophe Leroy Subject: [PATCH v3 02/19 5.15.y] minmax: Introduce {min,max}_array() Date: Wed, 8 Oct 2025 15:29:27 +0000 Message-ID: <20251008152946.29285-3-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251008152946.29285-1-farbere@amazon.com> References: <20251008152946.29285-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D032UWA001.ant.amazon.com (10.13.139.62) To EX19D001UWA001.ant.amazon.com (10.13.138.214) 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