linux-kernel - Re: [PATCH] ACPI / PPTT: get PPTT table in the first beginning

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Date:   Wed, 1 Sep 2021 16:15:11 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Zenghui Yu <yuzenghui@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>
CC:     Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        <catalin.marinas@....com>, <will@...nel.org>, <rjw@...ysocki.net>,
        <viresh.kumar@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] ACPI / PPTT: get PPTT table in the first beginning

On 2021/9/1 15:29, Zenghui Yu wrote:
> 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").

Please see the patch provided by Thomas Gleixner, it should
fix this issue in a better way:

https://lkml.org/lkml/2021/8/31/352

Thanks
Hanjun