On Tue, 2019-06-11 at 09:54 +0200, Christoph Hellwig wrote: > On Tue, Jun 11, 2019 at 04:59:54PM +1000, Benjamin Herrenschmidt > wrote: > > Ah stupid me ... it's dma_set_mask that failed, since it has no > > idea > > that the calling driver is limited to lowmem. > > > > That's also why the "wrong" patch worked. > > > > So yes, a ZONE_DMA at 30-bits will work, though it's somewhat > > overkill. > > Well, according to Larry it doesn't actually work, which is odd. Oh I assume that's just a glitch in the patch :-) Cheers, Ben.
