Testing the latest linux git tree turned up a few bugs with page migration to and from ZONE_DEVICE private and anonymous pages. Hopefully it clarifies how ZONE_DEVICE private struct page uses the same mapping and index fields from the source anonymous page mapping. Patch #3 was sent earlier and this is v2 with an updated change log. http://lkml.kernel.org/r/20190709223556.28908-1-rcampbell@xxxxxxxxxx Ralph Campbell (3): mm: document zone device struct page reserved fields mm/hmm: fix ZONE_DEVICE anon page mapping reuse mm/hmm: Fix bad subpage pointer in try_to_unmap_one include/linux/mm_types.h | 9 ++++++++- kernel/memremap.c | 4 ++++ mm/rmap.c | 1 + 3 files changed, 13 insertions(+), 1 deletion(-) -- 2.20.1
