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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?
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