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Subject[PATCH v7 0/6] Fix some bugs related to ramp and dax
This series is based on next-20220225.

Patch 1-2 fix a cache flush bug, because subsequent patches depend on
those on those changes, there are placed in this series. Patch 3-4
are preparation for fixing a dax bug in patch 5. Patch 6 is code cleanup
since the previous patch remove the usage of follow_invalidate_pte().

- Remove redurant "*" above vma_address() reported by Christoph.
- Fix oops (reported by Qian) on arm64 by using "pmd_present() && pmd_devmap()"
to workaround the bug in pmd_leaf() on arm64, which is fixed in another
patch [1].


- Collect Reviewed-by from Christoph Hellwig.
- Fold dax_entry_mkclean() into dax_writeback_one().

- Collect Reviewed-by from Dan Williams.
- Fix panic reported by kernel test robot <>.
- Remove pmdpp parameter from follow_invalidate_pte() and fold it into follow_pte().

- Fix compilation error on riscv.

- Based on next-20220225.

- Avoid the overly long line in lots of places suggested by Christoph.
- Fix a compiler warning reported by kernel test robot since pmd_pfn()
is not defined when !CONFIG_TRANSPARENT_HUGEPAGE on powerpc architecture.
- Split a new patch 4 for preparation of fixing the dax bug.

Muchun Song (6):
mm: rmap: fix cache flush on THP pages
dax: fix cache flush on PMD-mapped pages
mm: rmap: introduce pfn_mkclean_range() to cleans PTEs
mm: pvmw: add support for walking devmap pages
dax: fix missing writeprotect the pte entry
mm: simplify follow_invalidate_pte()

fs/dax.c | 98 +++++++---------------------------------------------
include/linux/mm.h | 3 --
include/linux/rmap.h | 3 ++
mm/internal.h | 26 +++++++++-----
mm/memory.c | 81 ++++++++++++-------------------------------
mm/page_vma_mapped.c | 17 ++++-----
mm/rmap.c | 68 +++++++++++++++++++++++++++++-------
7 files changed, 120 insertions(+), 176 deletions(-)


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