linux-kernel - Re: [PATCH v2 2/3] ACPI: APEI: GHES: Extract helper functions for error status handling

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Message-ID: <c164959b-6d51-4a6d-af3f-8c44106f57d3@linux.alibaba.com>
Date: Mon, 12 Jan 2026 10:57:08 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Donglin Peng <dolinux.peng@...il.com>, tony.luck@...el.com,
 guohanjun@...wei.com, mchehab@...nel.org, yazen.ghannam@....com,
 dave.jiang@...el.com, Smita.KoralahalliChannabasappa@....com,
 leitao@...ian.org, pengdonglin@...omi.com, baolin.wang@...ux.alibaba.com,
 benjamin.cheatham@....com, bp@...en8.de, dan.j.williams@...el.com,
 james.morse@....com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org, zhuo.song@...ux.alibaba.com
Subject: Re: [PATCH v2 2/3] ACPI: APEI: GHES: Extract helper functions for
 error status handling



On 1/10/26 5:22 AM, Rafael J. Wysocki wrote:
> On Mon, Jan 5, 2026 at 6:42 AM Shuai Xue <xueshuai@...ux.alibaba.com> wrote:
>>
>>
>>
>> On 1/5/26 1:12 PM, Donglin Peng wrote:
>>> On Sun, Jan 4, 2026 at 8:05 PM Shuai Xue <xueshuai@...ux.alibaba.com> wrote:
>>>>
>>>> Refactors the GHES driver by extracting common functionality into
>>>> reusable helper functions:
>>>>
>>>> 1. ghes_has_active_errors() - Checks if any error sources in a given list
>>>>      have active errors
>>>> 2. ghes_map_error_status() - Maps error status address to virtual address
>>>> 3. ghes_unmap_error_status() - Unmaps error status virtual address
>>>>
>>>> These helpers eliminate code duplication in the NMI path and prepare for
>>>> similar usage in the SEA path in a subsequent patch.
>>>>
>>>> No functional change intended.
>>>>
>>>> Tested-by: Tony Luck <tony.luck@...el.com>
>>>> Reviewed-by: Tony Luck <tony.luck@...el.com>
>>>> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
>>>> ---
>>>>    drivers/acpi/apei/ghes.c | 93 +++++++++++++++++++++++++++++++---------
>>>>    1 file changed, 72 insertions(+), 21 deletions(-)
>>>>
>>>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>>>> index 0e97d50b0240..7600063fe263 100644
>>>> --- a/drivers/acpi/apei/ghes.c
>>>> +++ b/drivers/acpi/apei/ghes.c
>>>> @@ -1406,6 +1406,75 @@ static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
>>>>           return ret;
>>>>    }
>>>>
>>>> +/**
>>>> + * ghes_has_active_errors - Check if there are active errors in error sources
>>>> + * @ghes_list: List of GHES entries to check for active errors
>>>> + *
>>>> + * This function iterates through all GHES entries in the given list and
>>>> + * checks if any of them has active error status by reading the error
>>>> + * status register.
>>>> + *
>>>> + * Return: true if at least one source has active error, false otherwise.
>>>> + */
>>>> +static bool __maybe_unused ghes_has_active_errors(struct list_head *ghes_list)
>>>> +{
>>>> +       bool active_error = false;
>>>> +       struct ghes *ghes;
>>>> +
>>>> +       rcu_read_lock();
>>>
>>> Nit: Use `guard(rcu)()` instead of explicit
>>> `rcu_read_lock()`/`rcu_read_unlock()`.
>>>
>>> Thanks,
>>> Donglin
>>>
>>
>> Hi, Donglin,
>>
>> Good point. Will fix in next version.
> 
> If you do so, you may also get rid of the active_error local variable.

Got it. Thanks for reminding.
Shuai