Re: [PATCH] semaphore: Add might_sleep() to down_*() family

[Thomas Gleixner]

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@xxxxxxxxxx/T/

OMG. None of this is necessary.