From patchwork Mon Aug 9 14:53:24 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: 494188 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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 2FBAEC4320E for ; Mon, 9 Aug 2021 14:55:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14AAD6101E for ; Mon, 9 Aug 2021 14:55:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235326AbhHIOzW (ORCPT ); Mon, 9 Aug 2021 10:55:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:44034 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233412AbhHIOzQ (ORCPT ); Mon, 9 Aug 2021 10:55:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3B17161019; Mon, 9 Aug 2021 14:54:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628520895; bh=PS8ZKE3pdHYqi+dT0eaCxhAkUEsUIJhdbc4pPLOtZm8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UvIHWsh1gGS57HMoC2UXCoLdvYBkwKh0kDEcz3nnxTXhob8u0bj/wudta5rwPZD90 HfTDPXYMPN0DslG6KJw8a0E22OsLj3nMO8pPbl3gY6QFm45jbXk/2Mrhg69aJZqZvK z799WVFe+6uB0qb81AfhhMjKfAZWLeK7FeBDjuQfawMrULAgJ95PGz4Aiu1fZYd/LU o/cRk+Sbweo1BZICtsXckAzxSZZUW6gi0awWQ/A8EGePkfGgA7iWCIfeY575aXUSbU moIUY5FsxKqmOKkXKVOj0BDzXmtH7LbzEvBu1JahR9XmK0pOdxTLuiFUOxTLym84ej /NCAAhcDJeBfQ== Received: by pali.im (Postfix) id DF601286B; Mon, 9 Aug 2021 16:54:52 +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 Subject: [PATCH v5 1/6] math64: New DIV_U64_ROUND_CLOSEST helper Date: Mon, 9 Aug 2021 16:53:24 +0200 Message-Id: <20210809145329.24177-2-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210809145329.24177-1-pali@kernel.org> References: <20210624224909.6350-1-pali@kernel.org> <20210809145329.24177-1-pali@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@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 66deb1fdc2ef..1cc61d748e1f 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -281,6 +281,19 @@ 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