linux-kernel - Re: [PATCH] maple_tree: export symbol mas

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Date:   Wed, 8 Mar 2023 15:34:29 +0100
From:   Danilo Krummrich <dakr@...hat.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Cc:     Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] maple_tree: export symbol mas_preallocate()

On 3/8/23 11:59, Vlastimil Babka wrote:
> On 3/2/23 02:52, Liam R. Howlett wrote:
>> Thanks for the patch.  This should indeed be exported.
>>
>> Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> 
> What uses it? Don't we export only things used by in-kernel modules?

mas_preallocate() is part of the maple tree's 'Advanced API'. All other 
functions of this API are exported already.

More specifically, e.g. mas_store_prealloc() is exported which doesn't 
make a lot of sense without mas_preallocate() being available too.

I don't think it is used outside of mm yet, but as a generic tree 
implementation maple tree is pretty likely to be used in code built as 
module, e.g. drivers.

> 
>> * Danilo Krummrich <dakr@...hat.com> [230301 20:10]:
>>> Fix missing EXPORT_SYMBOL_GPL() statement for mas_preallocate().
>>>
>>> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
>>> ---
>>>   lib/maple_tree.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
>>> index 26e2045d3cda..3bfb8a6f3f6d 100644
>>> --- a/lib/maple_tree.c
>>> +++ b/lib/maple_tree.c
>>> @@ -5733,6 +5733,7 @@ int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp)
>>>   	mas_reset(mas);
>>>   	return ret;
>>>   }
>>> +EXPORT_SYMBOL_GPL(mas_preallocate);
>>>   
>>>   /*
>>>    * mas_destroy() - destroy a maple state.
>>> -- 
>>> 2.39.2
>>>
>>
>