linux-kernel - Re: [GIT PULL] Urgent ACPI support fix for v6.18

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Message-ID: <1ea445d0-0949-4a28-9f76-325861a3c57f@huawei.com>
Date: Thu, 27 Nov 2025 10:09:46 +0800
From: "lihuisong (C)" <lihuisong@...wei.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
CC: ACPI Devel Maling List <linux-acpi@...r.kernel.org>, Linux PM
	<linux-pm@...r.kernel.org>, Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>, Linus Torvalds
	<torvalds@...ux-foundation.org>, <lihuisong@...wei.com>
Subject: Re: [GIT PULL] Urgent ACPI support fix for v6.18

Hello Rafael,

在 2025/11/26 20:54, Rafael J. Wysocki 写道:
> Hi Linus,
>
> Please pull from the tag
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \
>   acpi-6.18-rc8
>
> with top-most commit 43ff36c4a5a574ee83b4b0d3f3d74f09a3a8c2d3
>
>   Revert "ACPI: processor: idle: Optimize ACPI idle driver registration"
>
> on top of commit ac3fd01e4c1efce8f2c054cdeb2ddd2fc0fb150d
>
>   Linux 6.18-rc7
>
> to receive an urgent ACPI support fix for 6.18.
>
> This reverts a commit that attempted to make the code in the ACPI
> processor driver more straightforward, but it turned out to cause
> the kernel to crash on at least one system, along with some further
> cleanups on top of it.
I just found that "ACPI: processor: idle: Optimize ACPI idle driver 
registration" depends on the change
about cpuhp_setup_state in the commit [1]. Or many CPUs don't create 
cpuidle directory.
What is the crash? Do you have releated trace?

[1] 
https://lore.kernel.org/all/20240529133446.28446-2-Jonathan.Cameron@huawei.com/ 

>
>
> ---------------
>
> Rafael J. Wysocki (5):
>        Revert "ACPI: processor: Do not expose global variable acpi_idle_driver"
>        Revert "ACPI: processor: idle: Redefine two functions as void"
>        Revert "ACPI: processor: idle: Rearrange declarations in header file"
>        Revert "ACPI: processor: Remove unused empty stubs of some functions"
>        Revert "ACPI: processor: idle: Optimize ACPI idle driver registration"
>
> ---------------
>
>   drivers/acpi/processor_driver.c |   6 +--
>   drivers/acpi/processor_idle.c   | 115 ++++++++++++++++------------------------
>   include/acpi/processor.h        |  34 +++++++++---
>   3 files changed, 76 insertions(+), 79 deletions(-)
>