linux-kernel - Re: [PATCH] xsk: Use pool->dma

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Message-ID: <CAHApi-k1myxp5wqh4ojLKmVQyY=UG8hNT4Vk5c1V22Ua_i2kvA@mail.gmail.com>
Date:   Sun, 23 Apr 2023 19:54:38 +0200
From:   Kal Cutter Conley <kal.conley@...tris.com>
To:     Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xsk: Use pool->dma_pages to check for DMA

> Compare pool->dma_pages instead of pool->dma_pages_cnt to check for an
> active DMA mapping. pool->dma_pages needs to be read anyway to access
> the map so this compiles to more efficient code.
>
> Signed-off-by: Kal Conley <kal.conley@...tris.com>
> Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

I forgot to specify the target tree. This patch should be applied to bpf-next.