linux-kernel - Re: [PATCH v17 2/3] mm: memory-failure: move return value documentation to function declaration

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Message-ID: <1e0a0f9b-7c58-4f70-b2d4-6b3c2c4143de@linux.alibaba.com>
Date: Tue, 17 Dec 2024 11:05:11 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: jane.chu@...cle.com, yazen.ghannam@....com, mark.rutland@....com,
 catalin.marinas@....com, mingo@...hat.com, robin.murphy@....com,
 Jonathan.Cameron@...wei.com, bp@...en8.de, rafael@...nel.org,
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 tanxiaofei@...wei.com, mawupeng1@...wei.com, tony.luck@...el.com,
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 jarkko@...nel.org
Cc: linux-acpi@...r.kernel.org, linux-mm@...ck.org,
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 zhuo.song@...ux.alibaba.com
Subject: Re: [PATCH v17 2/3] mm: memory-failure: move return value
 documentation to function declaration



在 2024/12/17 07:37, jane.chu@...cle.com 写道:
> 
> On 12/1/2024 7:05 PM, Shuai Xue wrote:
>> Part of return value comments for memory_failure() were originally
>> documented at the call site. Move those comments to the function
>> declaration to improve code readability and to provide developers with
>> immediate access to function usage and return information.
>>
>> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
>> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Reviewed-by: Yazen Ghannam <yazen.ghannam@....com>
>> ---
>>   arch/x86/kernel/cpu/mce/core.c |  7 -------
>>   mm/memory-failure.c            | 10 +++++++---
>>   2 files changed, 7 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
>> index 7fb5556a0b53..d1dd7f892514 100644
>> --- a/arch/x86/kernel/cpu/mce/core.c
>> +++ b/arch/x86/kernel/cpu/mce/core.c
>> @@ -1398,13 +1398,6 @@ static void kill_me_maybe(struct callback_head *cb)
>>           return;
>>       }
>> -    /*
>> -     * -EHWPOISON from memory_failure() means that it already sent SIGBUS
>> -     * to the current process with the proper error info,
>> -     * -EOPNOTSUPP means hwpoison_filter() filtered the error event,
>> -     *
>> -     * In both cases, no further processing is required.
>> -     */
>>       if (ret == -EHWPOISON || ret == -EOPNOTSUPP)
>>           return;
>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>> index a7b8ccd29b6f..14c316d7d38d 100644
>> --- a/mm/memory-failure.c
>> +++ b/mm/memory-failure.c
>> @@ -2211,9 +2211,13 @@ static void kill_procs_now(struct page *p, unsigned long pfn, int flags,
>>    * Must run in process context (e.g. a work queue) with interrupts
>>    * enabled and no spinlocks held.
>>    *
>> - * Return: 0 for successfully handled the memory error,
>> - *         -EOPNOTSUPP for hwpoison_filter() filtered the error event,
>> - *         < 0(except -EOPNOTSUPP) on failure.
>> + * Return:
>> + *   0             - success,
>> + *   -ENXIO        - memory not managed by the kernel
>> + *   -EOPNOTSUPP   - hwpoison_filter() filtered the error event,
>> + *   -EHWPOISON    - the page was already poisoned, potentially
>> + *                   kill process,
>> + *   other negative values - failure.
>>    */
>>   int memory_failure(unsigned long pfn, int flags)
>>   {
> 
> Looks good.
> 
> Reviewed-by: Jane Chu <jane.chu@...cle.com>
> 
> -jane


Thanks.

Best Regards,
Shuai