linux-kernel - Re: [PATCH v3 1/2] asm-generic: Add memory barrier dma

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Date:   Mon, 23 May 2022 11:36:29 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Marco Elver <elver@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] asm-generic: Add memory barrier dma_mb()

On Mon, May 23, 2022 at 4:00 AM Kefeng Wang <wangkefeng.wang@...wei.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, this
> is only defined on arm64, but it is a generic memory barrier, let's
> add dma_mb() into documentation and include/asm-generic/barrier.h.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---

I assume you plan this to get merged through the arm64 tree.

Reviewed-by: Arnd Bergmann <arnd@...db.de> # for asm-generic