> I'm still not convinced. Will kmap what, src? At this point src might become just a bogus pointer. As long as the memory is still there, we can kmap it by its page struct. But if it is not there anymore, we have no way. > Why couldn't the object have been moved somewhere else (due to the compaction mechanism for instance) > at the time DMA kicks in? So zs_map_object() will guarantee the src won't be moved by holding those preemption-disabled lock? If so, it seems we have to drop the MOVABLE gfp in zswap for zsmalloc case? > > > > > ~Vitaly > Thanks Barry
