[PATCH v4 0/4] mm: A few cleanup patches around zap, shmem and uffd

[Peter Xu <peterx@redhat.com>]

[Based on v5.14-rc1]

Hi, Andrew,

I dropped patch 5 and will do it later when it justifies itself better.  Each
patch of this series now contains at least 1 R-b, would you consider merge it?

Thanks,

v4:
- Patch "mm: Drop first_index/last_index in zap_details"
  - Put first_index and last_index into two lines [Liam]
- Pick up r-bs
- Drop patch 5 for future

v3:
- Patch "mm: Add zap_skip_check_mapping() helper"
  - In zap_skip_check_mapping() check zap_mapping first [Alistair]
- Patch "mm: Add ZAP_FLAG_SKIP_SWAP and zap_flags":
  - Fix English errors in commit message [David]
  - Drop paragraph mentioning commit 22061a1ffabd in commit msg
  - Set ZAP_FLAG_SKIP_SWAP for unmap_mapping_page() too
- Pick up r-bs

v2:
- Patch "mm: Clear vmf->pte after pte_unmap_same() returns"
  - Remove one comment [David]
- Collect r-b for patch 2/3
- Rewrite the last two patches to drop ZAP_FLAG_CHECK_MAPPING, dropping
  Alistair's r-b on patch 5 because it changed [David, Matthew]

===== v1 cover letter =====

I picked up these patches from uffd-wp v5 series here:

https://lore.kernel.org/lkml/20210715201422.211004-1-peterx@redhat.com/

IMHO all of them are very nice cleanups to existing code already, they're all
small and self-contained.  They'll be needed by uffd-wp coming series.  I would
appreciate if they can be accepted earlier, so as to not carry them over always
with the uffd-wp series.

I removed some CC from the uffd-wp v5 series to reduce the noise, and added a
few more into it.

Reviews are greatly welcomed, thanks.

Peter Xu (4):
  mm/shmem: Unconditionally set pte dirty in mfill_atomic_install_pte
  mm: Clear vmf->pte after pte_unmap_same() returns
  mm: Drop first_index/last_index in zap_details
  mm: Add zap_skip_check_mapping() helper

 include/linux/mm.h | 18 ++++++++++--
 mm/memory.c        | 72 +++++++++++++++++++---------------------------
 mm/shmem.c         |  1 -
 mm/userfaultfd.c   |  3 +-
 4 files changed, 46 insertions(+), 48 deletions(-)

-- 
2.31.1