[PATCH v5 0/6] userfaultfd: convert userfaultfd functions to use folios

Peng Zhang
2023-03-31T09:42:00Z

From: ZhangPeng <zhangpeng362@huawei.com>

This patch series converts several userfaultfd functions to use folios.

Change log:

v4->v5:
- Update commit description and change page_kaddr to kaddr, suggested by
Matthew Wilcox. (patch 1,6)
- Remove pages_per_huge_page from copy_user_folio(), suggested by
Matthew Wilcox. (patch 5)
- Add RB from Sidhartha Kumar. (patch 1,3,4)

v3->v4:
- Rebase onto mm-unstable per Andrew Morton. Update commit description
because some function names are changed. (patch 1,4,6)

v2->v3:
- Split patch 2 into three patches, suggested by Mike Kravetz. (patch
2-4)
- Add a new patch to convert copy_user_huge_page to copy_user_folio,
suggested by Mike Kravetz. (patch 5)
- Fix two uninitialized bugs, thanks to Dan Carpenter. (patch 6)
- Do some indenting cleanups.

v1->v2:
Modified patch 2, suggested by Matthew Wilcox:
- Rename copy_large_folio_from_user() to copy_folio_from_user().
- Delete the inner_folio.
- kmap() and kmap_atomic() are converted to kmap_local_page(). Use
pagefault_disable() to ensure that a deadlock will not occur.
- flush_dcache_folio() is placed outside the loop.

ZhangPeng (6):
userfaultfd: convert mfill_atomic_pte_copy() to use a folio
userfaultfd: use kmap_local_page() in copy_huge_page_from_user()
userfaultfd: convert copy_huge_page_from_user() to
copy_folio_from_user()
userfaultfd: convert mfill_atomic_hugetlb() to use a folio
mm: convert copy_user_huge_page() to copy_user_folio()
userfaultfd: convert mfill_atomic() to use a folio

include/linux/hugetlb.h | 4 +-
include/linux/mm.h | 14 +++----
include/linux/shmem_fs.h | 4 +-
mm/hugetlb.c | 39 ++++++++----------
mm/memory.c | 64 ++++++++++++++---------------
mm/shmem.c | 16 ++++----
mm/userfaultfd.c | 89 ++++++++++++++++++++--------------------
7 files changed, 110 insertions(+), 120 deletions(-)

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2.25.1