From patchwork Wed Sep 29 08:20:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12524879 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3782EC433F5 for ; Wed, 29 Sep 2021 08:25:07 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 013E96138E for ; Wed, 29 Sep 2021 08:25:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 013E96138E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9Jwp9EAaro4L1TbEITqwjAvfvZOBWETsgeXSvYTHW8M=; b=iiTrwsXQs4P/7A vSz1GWG593ZqdGJqdZl9dCugtPwrwne7WswIqixk03joLUQO0dY9Kbvc49Yx0VGcTZymGqNQI/tQc 8b5lgDkVlqGHtaNmTmw0TPyArOPd9T3gf5DxdgBN7DUvECbfV8isFrtd20EfRiZ47LR4O//2LSUFZ CNV9snSOVn1w92l326mrsH70cB5Z/JWnmzXxDDgfE/fVxHuEFCAeW2FHb5p3AadybFamXUQ8MCsE0 GTGnO6QL4PoCqJtixti4G9cn9aLWW1HN9rSJxhfovWmyWzrG1w5QRBJxJO2ucNy/zgzYnytH1jzdW yki4dQz5d4YkQfOwu2xg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mVUrs-00AO0F-P8; Wed, 29 Sep 2021 08:23:08 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mVUrd-00ANud-KT for linux-arm-kernel@lists.infradead.org; Wed, 29 Sep 2021 08:22:54 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1AC52613A5; Wed, 29 Sep 2021 08:22:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632903773; bh=pFht2crJ58fEPAb0efcLhPOBTsC8scTXAQlpfMeAVoo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NE0W7RT1jcYVcpIAlzvMmZd6a92lZSJWgdIA0bWsVhZF0khaC2FuATVFlwg1j/AmG nCyKNQf9gwzuuhJg4m195i1ot/K1jqDxc+xwa/OPFM/9jqiGvUhWiADtfifftW0F8K DlN3VRYHgQD0ra+jGWz4gwSR1lYNHljNF6uxfjyZA+fKE2USBL++8znkmYcu8Z8QkH NY8fUyjCRpzWoztyUeziNi4ywJ2Px5AQEHjKCZ/5Eb2htVpl/A41YH0YEft7k0I44V yUWAW/PRrcARzXB4+do9RTXrtAqaFJDqQEsGY0fiZqAEqf9vuOVx00DuaVy3SoGQ6A e9vGVYvHxRH2Q== Received: by pali.im (Postfix) id 2A5811A0B; Wed, 29 Sep 2021 10:22:51 +0200 (CEST) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Michael Turquette , Stephen Boyd , Rob Herring , Greg Kroah-Hartman Cc: Andrew Lunn , Gregory Clement , Sebastian Hesselbarth , Vladimir Vid , =?utf-8?q?Marek_Beh=C3=BAn?= , linux-clk@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Subject: [PATCH v6 1/6] math64: New DIV_U64_ROUND_CLOSEST helper Date: Wed, 29 Sep 2021 10:20:29 +0200 Message-Id: <20210929082034.15098-2-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210929082034.15098-1-pali@kernel.org> References: <20210929082034.15098-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210929_012253_735130_15FCBC9D X-CRM114-Status: UNSURE ( 8.94 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Provide DIV_U64_ROUND_CLOSEST helper which uses div_u64 to perform division rounded to the closest integer using unsigned 64bit dividend and unsigned 32bit divisor. Signed-off-by: Pali Rohár --- include/linux/math64.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/math64.h b/include/linux/math64.h index 2928f03d6d46..a14f40de1dca 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -300,6 +300,19 @@ u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div); #define DIV64_U64_ROUND_CLOSEST(dividend, divisor) \ ({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); }) +/* + * DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer + * @dividend: unsigned 64bit dividend + * @divisor: unsigned 32bit divisor + * + * Divide unsigned 64bit dividend by unsigned 32bit divisor + * and round to closest integer. + * + * Return: dividend / divisor rounded to nearest integer + */ +#define DIV_U64_ROUND_CLOSEST(dividend, divisor) \ + ({ u32 _tmp = (divisor); div_u64((u64)(dividend) + _tmp / 2, _tmp); }) + /* * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer * @dividend: signed 64bit dividend