Alistair Popple wrote: > The rmap doesn't currently support adding a PUD mapping of a > folio. This patch adds support for entire PUD mappings of folios, > primarily to allow for more standard refcounting of device DAX > folios. Currently DAX is the only user of this and it doesn't require > support for partially mapped PUD-sized folios so we don't support for > that for now. > > Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx> > Acked-by: David Hildenbrand <david@xxxxxxxxxx> > > --- > > Changes for v6: > > - Minor comment formatting fix > - Add an additional check for CONFIG_TRANSPARENT_HUGEPAGE to fix a > build breakage when CONFIG_PGTABLE_HAS_HUGE_LEAVES is not defined. > > Changes for v5: > > - Fixed accounting as suggested by David. > > Changes for v4: > > - New for v4, split out rmap changes as suggested by David. > --- > include/linux/rmap.h | 15 ++++++++++- > mm/rmap.c | 67 ++++++++++++++++++++++++++++++++++++++++++--- > 2 files changed, 78 insertions(+), 4 deletions(-) Looks mechanically correct to me. Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
