v2: - patch 4: move hugetlb_unshare_all_pmds() into mm/hugetlb.c, so it can be used even outside userfaultfd.c This series tries to disable huge pmd unshare of hugetlbfs backed memory for uffd-wp. Although uffd-wp of hugetlbfs is still during rfc stage, the idea of this series may be needed for multiple tasks (Axel's uffd minor fault series, and Mike's soft dirty series), so I picked it out from the larger series. References works: Uffd shmem+hugetlbfs rfc: https://lore.kernel.org/lkml/20210115170907.24498-1-peterx@xxxxxxxxxx/ Uffd minor mode for hugetlbfs: https://lore.kernel.org/lkml/20210212215403.3457686-1-axelrasmussen@xxxxxxxxxx/ Soft dirty for hugetlbfs: https://lore.kernel.org/lkml/20210211000322.159437-1-mike.kravetz@xxxxxxxxxx/ Please review, thanks. Peter Xu (4): hugetlb: Pass vma into huge_pte_alloc() and huge_pmd_share() hugetlb/userfaultfd: Forbid huge pmd sharing when uffd enabled mm/hugetlb: Move flush_hugetlb_tlb_range() into hugetlb.h hugetlb/userfaultfd: Unshare all pmds for hugetlbfs when register wp arch/arm64/mm/hugetlbpage.c | 7 ++- arch/ia64/mm/hugetlbpage.c | 3 +- arch/mips/mm/hugetlbpage.c | 4 +- arch/parisc/mm/hugetlbpage.c | 2 +- arch/powerpc/mm/hugetlbpage.c | 3 +- arch/s390/mm/hugetlbpage.c | 2 +- arch/sh/mm/hugetlbpage.c | 2 +- arch/sparc/mm/hugetlbpage.c | 1 + fs/userfaultfd.c | 4 ++ include/linux/hugetlb.h | 16 +++++- include/linux/userfaultfd_k.h | 9 ++++ mm/hugetlb.c | 94 +++++++++++++++++++++++++++-------- mm/userfaultfd.c | 2 +- 13 files changed, 114 insertions(+), 35 deletions(-) -- 2.26.2
