linux-kernel - Re: [PATCH net-next v2 06/12] net: skbuff: don't include <net/page

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Message-ID: <f9f6ef1e-8acb-5bca-3cc6-16698363870d@intel.com>
Date:   Tue, 30 May 2023 15:12:49 +0200
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Michal Kubiak <michal.kubiak@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Ilias Apalodimas" <ilias.apalodimas@...aro.org>,
        Christoph Hellwig <hch@....de>,
        Paul Menzel <pmenzel@...gen.mpg.de>, <netdev@...r.kernel.org>,
        <intel-wired-lan@...ts.osuosl.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 06/12] net: skbuff: don't include
 <net/page_pool.h> into <linux/skbuff.h>

From: Jakub Kicinski <kuba@...nel.org>
Date: Fri, 26 May 2023 20:54:10 -0700

> On Thu, 25 May 2023 14:57:40 +0200 Alexander Lobakin wrote:
>> Currently, touching <net/page_pool.h> triggers a rebuild of more than
>> a half of the kernel. That's because it's included in <linux/skbuff.h>.
>>
>> In 6a5bcd84e886 ("page_pool: Allow drivers to hint on SKB recycling"),
>> Matteo included it to be able to call a couple functions defined there.
>> Then, in 57f05bc2ab24 ("page_pool: keep pp info as long as page pool
>> owns the page") one of the calls was removed, so only one left.
>> It's call to page_pool_return_skb_page() in napi_frag_unref(). The
>> function is external and doesn't have any dependencies. Having include
>> of very niche page_pool.h only for that looks like an overkill.
>> Instead, move the declaration of that function to skbuff.h itself, with
>> a small comment that it's a special guest and should not be touched.
>> Now, after a few include fixes in the drivers, touching page_pool.h
>> only triggers rebuilding of the drivers using it and a couple core
>> networking files.
> 
> drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> 
> came in the meantime, and did not bother including page_pool.h.

Hah, I saw it coming, but thought they did include it :D
Will fix in a bit, thanks for noticing!

Olek