From patchwork Sat Jul 17 12:38:25 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: 12383591 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3453DC636C9 for ; Sat, 17 Jul 2021 12:41:04 +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 02EDB611C1 for ; Sat, 17 Jul 2021 12:41:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 02EDB611C1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@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=SvXcdL0lBAb/fq20LL+JSXwI1SBkHYIrjU5ZwsY//JE=; b=JAEaxyWQJfbnr9 7ot1aOsDQui4hdTianfJuJtVhfZprDZEH5RZQ2QCQkEG9AWGGVJxS/OBPlDEk2Y8yQbpl8xa00mRA wtRWk8DA9wyy43jS9Ddb+Vhj424EsE3q9dcMuSqL0anhgoJOtFqIytyoXaAYE8vItHF4qKXmrwZcW HJoSJ47RDrCBtj6Gmzol/0efBvKDran0GjVKPQJQ0VvHxxcpYzxWD8XeoVFMViMsrZi1iKetzrYOi 5IQr2NolLV4X2wcPJMtQ2sJ/0sDNNNalmcHcN+xRXfO5mcxUURBLSCV4r3Ry8RSIg1/kqPGRvaOJL 4aEczhYyWE8+rJ9d4XGQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4jao-006bzO-7R; Sat, 17 Jul 2021 12:38:54 +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 1m4jaj-006bxX-QT for linux-arm-kernel@lists.infradead.org; Sat, 17 Jul 2021 12:38:51 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76FF3613D9; Sat, 17 Jul 2021 12:38:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1626525528; bh=Ke1OwpWSzbImBXh38I5IeSSNi+Q5RSfaXaZ9pXeQzBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V7iIELCi9OM8fPWEL6qjIfvY6whY/MBi/7JREp06TUt87IClGjLslAwT6izfkPOb0 4hbZCKeF+KarYUW8akH743hSEB5WST2KhpTHRfRs9SAW5DYSfBnLbi6oaQo72vckLj zRzj2VffMMZDOpSeCN4Jhmty7V0lWwiO5IuSWK6/rYMc6x4z1ddxtrd/xYWdGBeXPA ehN7R1ET1NBNB9Iszt7NEC3USsSF2FLPUt+2j0mOm9/s34nwWg5IMXBioSfG7tkOuH /yjirHAj7acsfmOJ+9PJo158EPM+1B4dIil+2FESPD0xBtIIbeG7IENtW+pdcM0lC6 3NoxT9Y0opuMg== Received: by pali.im (Postfix) id 944F0EEB; Sat, 17 Jul 2021 14:38:46 +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?= , "Geert Uytterhoeven" , linux-clk@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 1/5] math64: New DIV_U64_ROUND_CLOSEST helper Date: Sat, 17 Jul 2021 14:38:25 +0200 Message-Id: <20210717123829.5201-2-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210717123829.5201-1-pali@kernel.org> References: <20210624224909.6350-1-pali@kernel.org> <20210717123829.5201-1-pali@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210717_053849_925380_E1FD4C8C X-CRM114-Status: UNSURE ( 7.91 ) 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 Reviewed-by: Geert Uytterhoeven --- 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