Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"

[Christoph Hellwig]

On Fri, Dec 23, 2022 at 09:10:39PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Dec 23, 2022 at 03:57:22PM +0100, Christoph Hellwig wrote:
> > On Fri, Dec 23, 2022 at 08:17:31PM +0530, Manivannan Sadhasivam wrote:
> > > Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> > 
> > Btw, if the hardware really does not like a kernel mapping, the
> > right way is to just keep using the normal dma allocator, but make
> > sure that there shared-dma-pool with the no-map property for the
> > device.
> 
> Sibi posted a series that uses a separate no-map carveout for this usecase:
> https://lore.kernel.org/lkml/20221213140724.8612-1-quic_sibis@xxxxxxxxxxx/

Oh, I've missed that entire thread.  I actually stumbled over this
today while finding it during a vmap audit..