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From:   Marco Elver <elver@google.com>
Date:   Fri, 17 Jun 2022 12:18:41 +0200
Message-ID: <CANpmjNMnA0VtExcvpV=Sr57RQ3xxVkHxhrTkvEKeHZ27bhud+w@mail.gmail.com>
Subject: Re: [PATCH v4 1/2] asm-generic: Add memory barrier dma_mb()
To:     paulmck@kernel.org
Cc:     Kefeng Wang <wangkefeng.wang@huawei.com>, catalin.marinas@arm.com,
        will@kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, mark.rutland@arm.com,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org,
        arnd@arndb.de, Peter Zijlstra <peterz@infradead.org>
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On Fri, 17 Jun 2022 at 01:13, Paul E. McKenney <paulmck@kernel.org> wrote:
>
> On Mon, May 23, 2022 at 01:35:27PM +0200, Marco Elver wrote:
> > On Mon, 23 May 2022 at 13:21, Kefeng Wang <wangkefeng.wang@huawei.com> wrote:
> > >
> > > The memory barrier dma_mb() is introduced by commit a76a37777f2c
> > > ("iommu/arm-smmu-v3: Ensure queue is read after updating prod pointer"),
> > > which is used to ensure that prior (both reads and writes) accesses
> > > to memory by a CPU are ordered w.r.t. a subsequent MMIO write.
> > >
> > > Reviewed-by: Arnd Bergmann <arnd@arndb.de> # for asm-generic
> > > Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> >
> > Reviewed-by: Marco Elver <elver@google.com>
>
> Just checking...  Did these ever get picked up?  It was suggested
> that they go up via the arm64 tree, if I remember correctly.

I don't see them in -next, and as far as I can tell, they're not in
the arm64 tree.

Thanks,
-- Marco