Le 01/09/2022 à 19:34, Suren Baghdasaryan a écrit : > Protect VMA from concurrent page fault handler while modifying it in > collapse_huge_page. Is the goal to protect changes in the anon_vma structure? AFAICS, the vma it self is not impacted here, only the anon_vma and the PMD/PTE are touched, and they have their own protection mechanism, isn't it? > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> > --- > mm/khugepaged.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index 01f71786d530..030680633989 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -1072,6 +1072,7 @@ static void collapse_huge_page(struct mm_struct *mm, > if (mm_find_pmd(mm, address) != pmd) > goto out_up_write; > > + vma_mark_locked(vma); > anon_vma_lock_write(vma->anon_vma); > > mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm,
