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[PATCH v4 0/3] restructure memfd code

This is a replacement for "Patch series restructure memfd code, v2"
which was previously in mmotm.  This previous series incorrectly moved
the memfd code out of shemm.c as a separate commit.  Please let me know
if there are any issues with the way code is restructured/moved in this
series.  Specifically, the last patch.

While redoing the series, all sparse warnings in mm/shmem.c are fixed
in patch 1.  Patch 2 updates comments, definitions, function names and
file checking such that patch 3 is code movement only.

v4 adds more cleanups in patch 2 before code movement.

Mike Kravetz (3):
  mm/shmem: add __rcu annotations and properly deref radix entry
  mm/shmem: update file sealing comments and file checking
  mm: restructure memfd code

 fs/Kconfig               |   3 +
 fs/fcntl.c               |   2 +-
 include/linux/memfd.h    |  16 +++
 include/linux/shmem_fs.h |  13 --
 mm/Makefile              |   1 +
 mm/memfd.c               | 345 +++++++++++++++++++++++++++++++++++++++++++++++
 mm/shmem.c               | 338 ++--------------------------------------------
 7 files changed, 377 insertions(+), 341 deletions(-)
 create mode 100644 include/linux/memfd.h
 create mode 100644 mm/memfd.c