linux-kernel - Re: ensure dma_alloc_coherent always returns zeroed memory

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Date:   Thu, 20 Dec 2018 14:39:20 +0000
From:   Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
To:     "hch@....de" <hch@....de>,
        "eugeniy.paltsev@...opsys.com" <eugeniy.paltsev@...opsys.com>
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>,
        "vineet.gupta1@...opsys.com" <vineet.gupta1@...opsys.com>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.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: ensure dma_alloc_coherent always returns zeroed memory

On Thu, 2018-12-20 at 15:34 +0100, hch@....de wrote:
> On Thu, Dec 20, 2018 at 02:32:52PM +0000, Eugeniy Paltsev wrote:
> > Hi Christoph,
> > 
> > I test kernel from your 'dma-alloc-always-zero' branch, and as
> > I can see we have DMA peripherals (like USB) broken.
> 
> I would be really surprised if that is caused by the patch to add
> the zeroing. 
Me too :)

>  Can you check which commit caused the issue by bisecting
> from a known good baseline?

Yep. At least kernel build from v4.20-rc4 (which is base for your branch)
seems to work fine.

-- 
 Eugeniy Paltsev