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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2816AC4167B for ; Mon, 11 Dec 2023 14:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344345AbjLKOPW (ORCPT ); Mon, 11 Dec 2023 09:15:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343914AbjLKOOu (ORCPT ); Mon, 11 Dec 2023 09:14:50 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5159C6A59 for ; Mon, 11 Dec 2023 06:00:15 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25541C43391; Mon, 11 Dec 2023 14:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702303214; bh=dT3TjpU5nkeVbApxHkWNYjJktKleH4Jfc/XG8mWzMKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UWc7TwGA1vCcS3JtS9qg5KNymYBVaVbV0SjLSDcPmo1PCAf/NOoMowc3PrK/C7f0M DQDPG22tfRh4HaN/WX3p/vHFwwGTHJLAvNh1oM6A51IermLPXJ5899c6JzXxAu9GFX ng1jbJkESdHhnzClfEN3z02QEdQQOyn338Vn0UwoNzuITSXW0lpzhcRZS4VyAFVKbV Gki7Ktne0tEjL2r2VVxi2OGuAcpeFbstsGNb2a52C4mY3mkZp0P3mOiUp+6ZrDY++/ wRyn4eChBxNRkS1rXOzzxaQb+gb+B+EbyvBxxdR2Pv7Bt9u45+wvXzmyVC7Z1pPcKm HMRmWjaMCIUPg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Keith Busch , Sagi Grimberg , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 5.15 14/19] nvme: introduce helper function to get ctrl state Date: Mon, 11 Dec 2023 08:57:48 -0500 Message-ID: <20231211135908.385694-14-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231211135908.385694-1-sashal@kernel.org> References: <20231211135908.385694-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.142 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Keith Busch [ Upstream commit 5c687c287c46fadb14644091823298875a5216aa ] The controller state is typically written by another CPU, so reading it should ensure no optimizations are taken. This is a repeated pattern in the driver, so start with adding a convenience function that returns the controller state with READ_ONCE(). Reviewed-by: Sagi Grimberg Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- drivers/nvme/host/nvme.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 590ffa3e1c497..e523427d8a581 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -360,6 +360,11 @@ struct nvme_ctrl { struct nvme_fault_inject fault_inject; }; +static inline enum nvme_ctrl_state nvme_ctrl_state(struct nvme_ctrl *ctrl) +{ + return READ_ONCE(ctrl->state); +} + enum nvme_iopolicy { NVME_IOPOLICY_NUMA, NVME_IOPOLICY_RR, -- 2.42.0