On Mon, Oct 04, 2021 at 03:22:22PM +0200, Christian König wrote: > That use case is completely unrelated to GUP and when this doesn't work we > have quite a problem. My read is that unmap_mapping_range() guarentees the physical TLB hardware is serialized across all CPUs upon return. It also guarentees GUP slow is serialized due to the page table spinlocks. Jason
