linux-kernel - Re: [PATCH v3] page_pool: add a comment explaining the fragment counter usage

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Message-ID: <815485547a20f80f6dce991b76a7b60aebf1a716.camel@redhat.com>
Date:   Tue, 21 Feb 2023 10:12:56 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        netdev@...r.kernel.org
Cc:     alexander.duyck@...il.com, Alexander Duyck <alexanderduyck@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] page_pool: add a comment explaining the fragment
 counter usage

On Sat, 2023-02-18 at 00:21 +0200, Ilias Apalodimas wrote:
> When reading the page_pool code the first impression is that keeping
> two separate counters, one being the page refcnt and the other being
> fragment pp_frag_count, is counter-intuitive.
> 
> However without that fragment counter we don't know when to reliably
> destroy or sync the outstanding DMA mappings.  So let's add a comment
> explaining this part.
> 
> Reviewed-by: Alexander Duyck <alexanderduyck@...com>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>

# Form letter - net-next is closed

The merge window for v6.3 has begun and therefore net-next is closed
for new drivers, features, code refactoring and optimizations.
We are currently accepting bug fixes only.

Please repost when net-next reopens after Mar 6th.

RFC patches sent for review only are obviously welcome at any time.