From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
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=-6.3 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,
	SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 82F22C4320A
	for <linux-kernel@archiver.kernel.org>; Wed,  1 Sep 2021 07:29:32 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id 67C3361056
	for <linux-kernel@archiver.kernel.org>; Wed,  1 Sep 2021 07:29:32 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S242597AbhIAHa1 (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Wed, 1 Sep 2021 03:30:27 -0400
Received: from szxga08-in.huawei.com ([45.249.212.255]:15235 "EHLO
        szxga08-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S231739AbhIAHa0 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 1 Sep 2021 03:30:26 -0400
Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.55])
        by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4Gzwf55hgDz1DFk1;
        Wed,  1 Sep 2021 15:28:45 +0800 (CST)
Received: from dggema764-chm.china.huawei.com (10.1.198.206) by
 dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id
 15.1.2176.2; Wed, 1 Sep 2021 15:29:27 +0800
Received: from [10.174.185.179] (10.174.185.179) by
 dggema764-chm.china.huawei.com (10.1.198.206) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id
 15.1.2308.8; Wed, 1 Sep 2021 15:29:26 +0800
Subject: Re: [PATCH] ACPI / PPTT: get PPTT table in the first beginning
To:     Sudeep Holla <sudeep.holla@arm.com>
CC:     Xiongfeng Wang <wangxiongfeng2@huawei.com>,
        <catalin.marinas@arm.com>, <will@kernel.org>, <rjw@rjwysocki.net>,
        <viresh.kumar@linaro.org>, <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
        <guohanjun@huawei.com>
References: <20210720112635.38565-1-wangxiongfeng2@huawei.com>
 <20210720133751.u6k6bdm7qco3gn65@bogus>
From:   Zenghui Yu <yuzenghui@huawei.com>
Message-ID: <a1390a6f-62aa-4cfd-b34e-1dbf0aedfc50@huawei.com>
Date:   Wed, 1 Sep 2021 15:29:26 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
 Thunderbird/68.9.0
MIME-Version: 1.0
In-Reply-To: <20210720133751.u6k6bdm7qco3gn65@bogus>
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-Originating-IP: [10.174.185.179]
X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To
 dggema764-chm.china.huawei.com (10.1.198.206)
X-CFilter-Loop: Reflected
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 2021/7/20 21:37, Sudeep Holla wrote:
> On Tue, Jul 20, 2021 at 07:26:35PM +0800, Xiongfeng Wang wrote:
>> When I added might_sleep() in down_timeout(), I got the following
> 
> Sorry it is not clear if you are able to reproduce this issue without
> any other modifications in the mainline kernel ?

Jump in this thread as the exact splat is triggered at boot time
in the latest mainline kernel thanks to commit 99409b935c9a
("locking/semaphore: Add might_sleep() to down_*() family").