[RFC 00/11] make try_to_unmap simple

[Minchan Kim]

Currently, try_to_unmap returns various return value(SWAP_SUCCESS,
SWAP_FAIL, SWAP_AGAIN, SWAP_DIRTY and SWAP_MLOCK). When I look into
that, it's unncessary complicated so this patch aims for cleaning
it up. Change ttu to boolean function so we can remove SWAP_AGAIN,
SWAP_DIRTY, SWAP_MLOCK.

This patchset is based on v4.10-mmots-2017-02-28-17-33.

Minchan Kim (11):
  mm: use SWAP_SUCCESS instead of 0
  mm: remove unncessary ret in page_referenced
  mm: remove SWAP_DIRTY in ttu
  mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu
  mm: make the try_to_munlock void function
  mm: remove SWAP_MLOCK in ttu
  mm: remove SWAP_AGAIN in ttu
  mm: make ttu's return boolean
  mm: make rmap_walk void function
  mm: make rmap_one boolean function
  mm: remove SWAP_[SUCCESS|AGAIN|FAIL]

 include/linux/ksm.h  |  5 ++-
 include/linux/rmap.h | 21 ++++--------
 mm/huge_memory.c     |  4 +--
 mm/ksm.c             | 16 ++++-----
 mm/memory-failure.c  | 22 ++++++------
 mm/migrate.c         |  4 +--
 mm/mlock.c           |  6 ++--
 mm/page_idle.c       |  4 +--
 mm/rmap.c            | 97 ++++++++++++++++++++--------------------------------
 mm/vmscan.c          | 26 +++-----------
 10 files changed, 73 insertions(+), 132 deletions(-)

-- 
2.7.4