linux-kernel - Re: [PATCH 1/2] dma-mapping: zero memory returned from dma_alloc

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Date:   Fri, 14 Dec 2018 12:12:00 +0000
From:   Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
To:     "hch@....de" <hch@....de>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>,
        "ashutosh.dixit@...el.com" <ashutosh.dixit@...el.com>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linux-c6x-dev@...ux-c6x.org" <linux-c6x-dev@...ux-c6x.org>,
        "monstr@...str.eu" <monstr@...str.eu>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 1/2] dma-mapping: zero memory returned from dma_alloc_*

Hi Christoph,

do you have any public git repository with all your dma changes?

I want to test them for ARC.

Thanks.

On Fri, 2018-12-14 at 09:25 +0100, Christoph Hellwig wrote:
> If we want to map memory from the DMA allocator to userspace it must be
> zeroed at allocation time to prevent stale data leaks.   We already do
> this on most common architectures, but some architectures don't do this
> yet, fix them up, either by passing GFP_ZERO when we use the normal page
> allocator or doing a manual memset otherwise.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
-- 
 Eugeniy Paltsev