Re: ensure dma_alloc_coherent always returns zeroed memory

Eugeniy Paltsev
2018-12-20T14:39:26Z

On Thu, 2018-12-20 at 15:34 +0100, hch@lst.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