diff options
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 516b1d847e2c..62c1f7945741 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -133,7 +133,7 @@ static long change_pte_range(struct mmu_gather *tlb, /* Also skip shared copy-on-write pages */ if (is_cow_mapping(vma->vm_flags) && (folio_maybe_dma_pinned(folio) || - folio_likely_mapped_shared(folio))) + folio_maybe_mapped_shared(folio))) continue; /* @@ -225,14 +225,6 @@ static long change_pte_range(struct mmu_gather *tlb, newpte = swp_entry_to_pte(entry); if (pte_swp_uffd_wp(oldpte)) newpte = pte_swp_mkuffd_wp(newpte); - } else if (is_writable_device_exclusive_entry(entry)) { - entry = make_readable_device_exclusive_entry( - swp_offset(entry)); - newpte = swp_entry_to_pte(entry); - if (pte_swp_soft_dirty(oldpte)) - newpte = pte_swp_mksoft_dirty(newpte); - if (pte_swp_uffd_wp(oldpte)) - newpte = pte_swp_mkuffd_wp(newpte); } else if (is_pte_marker_entry(entry)) { /* * Ignore error swap entries unconditionally, @@ -607,7 +599,7 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, unsigned long start, unsigned long end, unsigned long newflags) { struct mm_struct *mm = vma->vm_mm; - unsigned long oldflags = vma->vm_flags; + unsigned long oldflags = READ_ONCE(vma->vm_flags); long nrpages = (end - start) >> PAGE_SHIFT; unsigned int mm_cp_flags = 0; unsigned long charged = 0; @@ -627,7 +619,7 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, * uncommon case, so doesn't need to be very optimized. */ if (arch_has_pfn_modify_check() && - (vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) && + (oldflags & (VM_PFNMAP|VM_MIXEDMAP)) && (newflags & VM_ACCESS_FLAGS) == 0) { pgprot_t new_pgprot = vm_get_page_prot(newflags); @@ -676,7 +668,7 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, * held in write mode. */ vma_start_write(vma); - vm_flags_reset(vma, newflags); + vm_flags_reset_once(vma, newflags); if (vma_wants_manual_pte_write_upgrade(vma)) mm_cp_flags |= MM_CP_TRY_CHANGE_WRITABLE; vma_set_page_prot(vma); |