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

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Date: Fri, 8 Mar 2024 16:08:50 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Mina Almasry <almasrymina@...gle.com>
Cc: David Wei <dw@...idwei.uk>, 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>, 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 Fri, 8 Mar 2024 16:04:14 -0800 Mina Almasry wrote:
> > 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.

It's all good. We have a policy in netdev of "no inline unless you can
prove it makes a difference". It will not make a difference here and it
will mute the "unused function" warning.