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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D2EC9C433F5 for ; Tue, 22 Feb 2022 16:36:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=R/D2PK6+/cfWn+SCy45HN5KBWgHkNQFK3LmX+dzqRT4=; b=Ncv3TbU9tE8mrmmnqncvbvnNMZ MqY9sagInr9p5IxUHBdRApravVKjlExHuVm0gGHR1kpdKwncsAJOeGaH3FOma2M2tlAlcuNTzeiSo V9xsZeLCUFAuGDLkz26VtLEwUjm+6CSQsDZ6a8A+GPMgr2vro3szY0QAIWYyG65IC7ud37Noc7ob1 jS6vaJmlbf/2w6kjzX1Nha0eyTlPZXoQOvqqe1czcGa/WTK86K87cOsnGrJQ/iHGJAoUCgKUssyfU mhv+rfaL+rkQF5s5lrnzlGhzRSUa2QgWMiHZ4Lk41uwRZiXUJqkVEZ3ljAwc/4FUlRZFsQhT15/7e rdf6CaeQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMY91-00Afr4-68; Tue, 22 Feb 2022 16:36:07 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMY5P-00Adqa-RH for linux-nvme@lists.infradead.org; Tue, 22 Feb 2022 16:32:27 +0000 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 63EC760A54; 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 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220222_083223_943337_84D3D1C3 X-CRM114-Status: GOOD ( 10.25 ) X-BeenThere: linux-nvme@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-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.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 --- 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 -- 2.25.4