linux-kernel - Re: [PATCH v3 04/24] dmaengine: qcom_hidma: Remove call to memset after dmam_alloc

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Message-ID: <72c45b14-f0c0-9d1c-0953-eea70ce513a0@kernel.org>
Date:   Mon, 15 Jul 2019 00:17:27 -0400
From:   Sinan Kaya <Okaya@...nel.org>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v3 04/24] dmaengine: qcom_hidma: Remove call to memset
 after dmam_alloc_coherent

On 7/14/2019 11:17 PM, Fuqian Huang wrote:
> In commit 518a2f1925c3
> ("dma-mapping: zero memory returned from dma_alloc_*"),
> dma_alloc_coherent has already zeroed the memory.
> So memset is not needed.
> 
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>

I don't see SWIO or ARM64 IOMMU drivers getting impacted by
the mentioned change above (518a2f1925c3).

 arch/alpha/kernel/pci_iommu.c    | 2 +-
 arch/arc/mm/dma.c                | 2 +-
 arch/c6x/mm/dma-coherent.c       | 5 ++++-
 arch/m68k/kernel/dma.c           | 2 +-
 arch/microblaze/mm/consistent.c  | 2 +-
 arch/openrisc/kernel/dma.c       | 2 +-
 arch/parisc/kernel/pci-dma.c     | 4 ++--
 arch/s390/pci/pci_dma.c          | 2 +-
 arch/sparc/kernel/ioport.c       | 2 +-
 arch/sparc/mm/io-unit.c          | 2 +-
 arch/sparc/mm/iommu.c            | 2 +-
 arch/xtensa/kernel/pci-dma.c     | 2 +-
 drivers/misc/mic/host/mic_boot.c | 2 +-
 kernel/dma/virt.c                | 2 +-
 14 files changed, 18 insertions(+), 15 deletions(-)

How does this new behavior apply globally?