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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     Hanjun Guo <guohanjun@huawei.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Xiaoming Ni <nixiaoming@huawei.com>
Cc:     linux-kernel@vger.kernel.org, peterz@infradead.org,
        mingo@redhat.com, will@kernel.org, longman@redhat.com,
        boqun.feng@gmail.com, wangle6@huawei.com, xiaoqian9@huawei.com,
        shaolexi@huawei.com, linux-acpi@vger.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Xiongfeng Wang <wangxiongfeng2@huawei.com>
Subject: Re: [PATCH] semaphore: Add might_sleep() to down_*() family
In-Reply-To: <9471f03d-942d-2143-5d87-8ec98bc38ec3@huawei.com>
References: <20210809021215.19991-1-nixiaoming@huawei.com>
 <20210831111322.GA1687117@roeck-us.net>
 <9471f03d-942d-2143-5d87-8ec98bc38ec3@huawei.com>
Date:   Tue, 31 Aug 2021 14:20:13 +0200
Message-ID: <87y28hdcw2.ffs@tglx>
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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.