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Date:   Mon, 5 Oct 2020 09:35:35 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     davem@...emloft.net, Magnus Karlsson <magnus.karlsson@...el.com>
Cc:     bjorn.topel@...el.com, ast@...nel.org, daniel@...earbox.net,
        netdev@...r.kernel.org, jonathan.lemon@...il.com,
        maximmi@...lanox.com, bpf@...r.kernel.org,
        jeffrey.t.kirsher@...el.com, anthony.l.nguyen@...el.com,
        maciej.fijalkowski@...el.com, maciejromanfijalkowski@...il.com,
        cristian.dumitrescu@...el.com
Subject: please revert [PATCH bpf-next v5 03/15] xsk: create and free buffer
 pool independently from umem

Hi Dave,

please can you rever this?  This is the second xsk patch this year
that pokes into dma-mapping internals for absolutely not reason.

And we discussed this in detail the last time around: drivers have
absolutely no business poking into dma-direct.h and dma-noncoherent.h.
In fact because people do this crap I have a patch to remove these
headers that I'm about to queue up, so if this doesn't get reverted
the linux-next build will break soon.

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