linux-kernel - Re: [PATCH v4 1/2] net: page_pool: export page_pool

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Date:   Tue, 15 Nov 2022 18:12:02 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Shenwei Wang <shenwei.wang@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        imx@...ts.linux.dev
Subject: Re: [PATCH v4 1/2] net: page_pool: export page_pool_stats definition

On Tue, Nov 15, 2022 at 09:57:43AM -0600, Shenwei Wang wrote:
> The definition of the 'struct page_pool_stats' is required even when
> the CONFIG_PAGE_POOL_STATS is not defined. Otherwise, it is required
> the drivers to handle the case of CONFIG_PAGE_POOL_STATS undefined.

I agree the API is broken, but i think there is a better fix.

There should be a stub of page_pool_get_stats() for when
CONFIG_PAGE_POOL_STATS is disabled.

Nothing actually dereferences struct page_pool_stats when you have
this stub. So it might be enough to simply have

struct page_pool_stats{
};

       Andrew