linux-kernel - Re: [PATCH] semaphore: Add might_sleep() to down

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Date:   Tue, 31 Aug 2021 14:20:13 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Hanjun Guo <guohanjun@...wei.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Xiaoming Ni <nixiaoming@...wei.com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, will@...nel.org, longman@...hat.com,
        boqun.feng@...il.com, wangle6@...wei.com, xiaoqian9@...wei.com,
        shaolexi@...wei.com, linux-acpi@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>
Subject: Re: [PATCH] semaphore: Add might_sleep() to down_*() family

On Tue, Aug 31 2021 at 19:39, Hanjun Guo wrote:
> On 2021/8/31 19:13, Guenter Roeck wrote:
>> This patch results in the following traceback on all arm64 boots with
>> EFI BIOS.
>> 
>> The problem is only seen with CONFIG_ACPI_PPTT=y, and thus only on arm64.
>
> I Cced Xiongfeng, he sent a patch to fix this issue over a month ago:
>
> https://lore.kernel.org/linux-arm-kernel/20210720112635.38565-1-wangxiongfeng2@huawei.com/T/

OMG. None of this is necessary.