On 4/26/18 1:20 AM, Christoph Hellwig wrote: > On Tue, Apr 24, 2018 at 08:02:56PM -0600, Jens Axboe wrote: >> On 4/24/18 12:16 PM, Christoph Hellwig wrote: >>> ide_toggle_bounce did select various strange block bounce limits, including >>> not bouncing at all as soon as an iommu is present in the system. Given >>> that the dma_map routines now handle any required bounce buffering except >>> for ISA DMA, and the ide code already must handle either ISA DMA or highmem >>> at least for iommu equipped systems we can get rid of the block layer >>> bounce limit setting entirely. >> >> Pretty sure I was the one to add this code, when highmem page IO was >> enabled about two decades ago... >> >> Outside of DMA, the issue was that the PIO code could not handle >> highmem. That's not the case anymore, so this should be fine. > > Yes, that is the rationale. Any chance to you could look over the > other patches as well? Except for the networking one for which I'd > really like to see a review from Dave all the users of the interface > are block related. You can add my reviewed-by to 1-3, and 5. Looks good to me. -- Jens Axboe
