From patchwork Thu Mar 3 20:13:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 12768063 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51BB2C433F5 for ; Thu, 3 Mar 2022 20:13:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236224AbiCCUOL (ORCPT ); Thu, 3 Mar 2022 15:14:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236187AbiCCUOJ (ORCPT ); Thu, 3 Mar 2022 15:14:09 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E059CC9A22; Thu, 3 Mar 2022 12:13:22 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 9FB8AB826D9; Thu, 3 Mar 2022 20:13:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1C32C340F1; Thu, 3 Mar 2022 20:13:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646338400; bh=z3/R9w70Bu9dBfiawHudSlINUX1Tv3ukTkQdVZxpKko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b65dP9xSQ7Fuff/lcNr6j4QM/x9FowDNeQfK+XRKSj/e+mn6WmpIGEXTndsVzx6eR MHKeJen8M8NG7GcS65GVUXhr9tbjzNxVSU77J3SDlN2dfkTZB6Aw6qQoHgmJ+MdT8X P4ZxXZTJkRrRdfM8iXiY63HU5CavQsChZf4oWVpheBsMxFEER1n/OSREAsQ7mFU0+V QMwz0M+hzGEuSHpzTL5U+fk7FpxCt6CliC4YZbzyEpZAbQ+lvyuKnr5aWIsvE7BVTf jMxptSG9ojNA+JF7+lVhvL/9sAMKrzl4rW/HpP4VDmbIzzo40/fpE/mzqPn3nzoYkh ZLnezYAavzkUQ== From: Keith Busch To: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: axboe@kernel.dk, hch@lst.de, martin.petersen@oracle.com, Keith Busch , Bart Van Assche Subject: [PATCHv4 4/8] linux/kernel: introduce lower_48_bits function Date: Thu, 3 Mar 2022 12:13:08 -0800 Message-Id: <20220303201312.3255347-5-kbusch@kernel.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20220303201312.3255347-1-kbusch@kernel.org> References: <20220303201312.3255347-1-kbusch@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Recent data integrity field enhancements allow reference tags to be up to 48 bits. Introduce an inline helper function since this will be a repeated operation. Suggested-by: Bart Van Assche Signed-off-by: Keith Busch Reviewed-by: Bart Van Assche --- include/linux/kernel.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 33f47a996513..3877478681b9 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -63,6 +63,15 @@ } \ ) +/** + * lower_48_bits() - return bits 0-47 of a number + * @n: the number we're accessing + */ +static inline u64 lower_48_bits(u64 n) +{ + return n & ((1ull << 48) - 1); +} + /** * upper_32_bits - return bits 32-63 of a number * @n: the number we're accessing