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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1783CC4332F for ; Wed, 29 Sep 2021 08:22:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAD2261439 for ; Wed, 29 Sep 2021 08:22:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244635AbhI2IYe (ORCPT ); Wed, 29 Sep 2021 04:24:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:33326 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244590AbhI2IYd (ORCPT ); Wed, 29 Sep 2021 04:24:33 -0400 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=20Roh=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=20Beh=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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.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 -- 2.20.1