linux-kernel - Re: [PATCH v2] mm: shrinker: avoid memleak in alloc_shrinker

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Message-ID: <b57f30e4-b1c3-4ceb-abb0-bd300cb80645@huaweicloud.com>
Date: Fri, 25 Oct 2024 09:22:35 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Vlastimil Babka <vbabka@...e.cz>,
 Roman Gushchin <roman.gushchin@...ux.dev>, akpm@...ux-foundation.org,
 david@...morbit.com
Cc: Muchun Song <muchun.song@...ux.dev>,
 Anshuman Khandual <anshuman.khandual@....com>,
 "Kirill A. Shutemov" <kirill@...temov.name>, zhengqi.arch@...edance.com,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, wangweiyang2@...wei.com
Subject: Re: [PATCH v2] mm: shrinker: avoid memleak in alloc_shrinker_info



On 2024/10/24 17:08, Vlastimil Babka wrote:
> On 10/24/24 03:26, Chen Ridong wrote:
>>>>> For example, if we use his v1 proposal, we should do
>>>>> the cleanups again for info. But for goto-based
>>>>> version, we just add another label to do the
>>>>> cleanups and go to the new label for failure case. goto-based fix is what I insisted on. I copied my previous suggested fix here to clarify my opinion.
>>>>
>>>> Again, info is a loop-iteration-local variable, v1 fix making it truly local
>>>> is the way to go. If there are further cleanups added in the loop itself in
>>>> the future, they could hopefully keep being local to the loop as well.
>>>> Cleanup of info outside the loop iteration is breaking its real scope.
>>>
>>> +1 to that.
>>>
>>> I don't think it's such a big deal and both versions are ok, but I strongly
>>> prefer the original version (without introduction of a new label).
>>>
>>> Please, feel free to use
>>> Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
>>> with the original version.
>>>
>>> Thanks!
>>
>> I agree with Roman.
>> Hello, Andrew and Dave, Do you have any opinions?
>>
>> The original version:
>> https://lore.kernel.org/linux-kernel/4184c61f-80f7-4adc-8929-c29f959cb8df@huawei.com/
> 
> Hi,
> 
> Can you resend the v1 as v3, but also move the declaration of "struct
> shrinker_info *info;" inside the for_each_node() block? Also you can add all
> the acks collected for that version and mine too:
> 
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Thanks.
> 
>> Best regards,
>> Ridong
>>
>>

Will update, Thanks.

Best regards,
Ridong