From patchwork Tue Feb 22 16:31:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 12755598 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 538EEC4332F for ; Tue, 22 Feb 2022 16:32:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234136AbiBVQdE (ORCPT ); Tue, 22 Feb 2022 11:33:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39970 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234095AbiBVQcu (ORCPT ); Tue, 22 Feb 2022 11:32:50 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37914BB091; Tue, 22 Feb 2022 08:32:24 -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 dfw.source.kernel.org (Postfix) with ESMTPS id C8CA860A2B; Tue, 22 Feb 2022 16:32:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 709A5C340F6; Tue, 22 Feb 2022 16:32:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645547543; bh=r/bd83ebHmk3oq087sNFUNNVtBRYLznJSmRLMlpTbUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GCSf5tRNML33gIhC3sIrrGWNIgk5kvVblmBu4I3xUoYSfiBZQ7ehJCYaFMnjgfYrh OEya2ydwEKX3H3fD0dwoZ6w+H+uVTnLvXdVh13m4ZYJeOwoVOR8FpM5mREFIghRXun Hbo1Vj+fgL7RwAtA8rRkuMSwCelOJIR8YWHIIT259xvZllYv4OVf9/3czpEuPPVy05 LfWvNjQZxOLoyJOF48fW/B6VWOY4CLWhcn4SoZpbDixEkczclmp/n15F/B5+EtU2/C QIy+oT0tinibuGXLKZUog8+xSn83qCPVsd+HVtOq+tDiYftWhlgYVwby4IeweuNnAO rEhXiElbv4AFg== From: Keith Busch To: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Cc: axboe@kernel.dk, hch@lst.de, martin.petersen@oracle.com, colyli@suse.de, Keith Busch , Bart Van Assche Subject: [PATCHv3 04/10] linux/kernel: introduce lower_48_bits macro Date: Tue, 22 Feb 2022 08:31:38 -0800 Message-Id: <20220222163144.1782447-5-kbusch@kernel.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20220222163144.1782447-1-kbusch@kernel.org> References: <20220222163144.1782447-1-kbusch@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Recent data integrity field enhancements allow 48-bit reference tags. Introduce a helper macro since this will be a repeated operation. Suggested-by: Bart Van Assche Signed-off-by: Keith Busch Reviewed-by: Chaitanya Kulkarni --- include/linux/kernel.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 33f47a996513..c1fa9fc2b5cd 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -63,6 +63,12 @@ } \ ) +/** + * lower_48_bits - return bits 0-47 of a number + * @n: the number we're accessing + */ +#define lower_48_bits(n) ((u64)((n) & 0xffffffffffffull)) + /** * upper_32_bits - return bits 32-63 of a number * @n: the number we're accessing