[PATCH v3 0/5] mm: A few cleanup patches around zap, shmem and uffd

From: Peter Xu
Date: Wed Sep 08 2021 - 12:35:26 EST


[Based on linus/master, commit ac08b1c68d1b which should contain the recent -mm
pull, if not applicable, I can repost anytime]

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@xxxxxxxxxx/

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 (5):
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
mm: Add ZAP_FLAG_SKIP_SWAP and zap_flags

include/linux/mm.h | 34 +++++++++++++++++++--
mm/memory.c | 76 +++++++++++++++++++---------------------------
mm/shmem.c | 1 -
mm/userfaultfd.c | 3 +-
4 files changed, 63 insertions(+), 51 deletions(-)

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2.31.1