Messages in this thread | | | Date | Mon, 20 May 2019 10:35:41 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH 12/18] soc: qcom: ipa: immediate commands |
| |
On Mon, May 20, 2019 at 09:55:42AM -0500, Alex Elder wrote: > On 5/20/19 9:50 AM, Arnd Bergmann wrote: > > Ok, that sounds reasonable, yes. I'm not sure if > > dma_alloc_coherent() guarantees zero-initialization > > though, so if that is required, you may have to > > add a memset(). > I had dma_zalloc_coherent() originally but I think > Christoph Hellwig posted something recently that > removed that function, because dma_alloc_coherent() > always zeroes the underlying memory. > > +Christoph, who might be able to explain or confirm
dma_alloc_coherent always zeroes the returned memory, which is why dma_zalloc_coherent has been removed.
| |