linux-kernel - Re: [PATCH net-next v1] net: page_pool: factor out page

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Date: Fri, 8 Mar 2024 16:07:32 -0800
From: David Wei <dw@...idwei.uk>
To: Mina Almasry <almasrymina@...gle.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Yunsheng Lin <linyunsheng@...wei.com>
Subject: Re: [PATCH net-next v1] net: page_pool: factor out page_pool recycle
 check

On 2024-03-08 16:04, Mina Almasry wrote:
> On Fri, Mar 8, 2024 at 3:50 PM David Wei <dw@...idwei.uk> wrote:
>>
>> On 2024-03-08 12:44, Mina Almasry wrote:
>>> The check is duplicated in 2 places, factor it out into a common helper.
>>>
>>> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>>> Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
>>> ---
>>>  net/core/page_pool.c | 9 +++++++--
>>>  1 file changed, 7 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
>>> index d706fe5548df..dd364d738c00 100644
>>> --- a/net/core/page_pool.c
>>> +++ b/net/core/page_pool.c
>>> @@ -657,6 +657,11 @@ static bool page_pool_recycle_in_cache(struct page *page,
>>>       return true;
>>>  }
>>>
>>> +static bool __page_pool_page_can_be_recycled(const struct page *page)
>>
>> Could this be made inline?
>>
> 
> Looking at the rest of the static functions in this file, they don't
> specify inline, just static. I guess the compiler is smart enough to
> inline static functions in .c files when it makes sense (and does not
> when it doesn't)?
> 
> But this doesn't seem to be a kernel wide thing. net/core/dev.c does
> have static inline functions in it, only page_pool.c doesn't do it. I
> guess if there are no objections I can make it static inline to ask
> the compiler to inline it. Likely after the merge window reopens if it
> closes today.

Thanks for checking. Otherwise the change looks good to me, pulling out
the same check in two locations into a(n inline) function then calling
that function instead.