Replace use of the legacy vm_flags_t flags with vma_flags_t values throughout the madvise logic.
In order to do so, update ksm_madvise() and hugepage_madvise() to take a vma_flags_t pointer, and update their other callers in mremap and the powerpc KVM ultravisor code accordingly. In the latter case we replace vm_flags_reset() with vma_overwrite_flags(). The VMA is write locked at this point, so the atomic flags preserved by vma_overwrite_flags() cannot differ from those copied, and the behaviour is unchanged. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) <[email protected]> --- arch/powerpc/kvm/book3s_hv_uvmem.c | 10 ++++---- include/linux/huge_mm.h | 4 ++-- include/linux/ksm.h | 4 ++-- mm/khugepaged.c | 10 ++++---- mm/ksm.c | 11 +++++---- mm/madvise.c | 47 ++++++++++++++++++++------------------ mm/mremap.c | 2 +- 7 files changed, 46 insertions(+), 42 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c index 463aef870c4e..0fa50bee2ffc 100644 --- a/arch/powerpc/kvm/book3s_hv_uvmem.c +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c @@ -393,7 +393,7 @@ static int kvmppc_memslot_page_merge(struct kvm *kvm, { unsigned long gfn = memslot->base_gfn; unsigned long end, start = gfn_to_hva(kvm, gfn); - vm_flags_t vm_flags; + vma_flags_t vma_flags; int ret = 0; struct vm_area_struct *vma; int merge_flag = (merge) ? MADV_MERGEABLE : MADV_UNMERGEABLE; @@ -411,15 +411,15 @@ static int kvmppc_memslot_page_merge(struct kvm *kvm, break; } vma_start_write(vma); - /* Copy vm_flags to avoid partial modifications in ksm_madvise */ - vm_flags = vma->vm_flags; + /* Copy flags to avoid partial modifications in ksm_madvise */ + vma_flags = vma->flags; ret = ksm_madvise(vma, vma->vm_start, vma->vm_end, - merge_flag, &vm_flags); + merge_flag, &vma_flags); if (ret) { ret = H_STATE; break; } - vm_flags_reset(vma, vm_flags); + vma_overwrite_flags(vma, vma_flags); start = vma->vm_end; } while (end > vma->vm_end); diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index c745f7ad2298..8b6f4101eabf 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -508,7 +508,7 @@ change_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, __split_huge_pud(__vma, __pud, __address); \ } while (0) -int hugepage_madvise(struct vm_area_struct *vma, vm_flags_t *vm_flags, +int hugepage_madvise(struct vm_area_struct *vma, vma_flags_t *vma_flags, int advice); int madvise_collapse(struct vm_area_struct *vma, unsigned long start, unsigned long end, bool *lock_dropped); @@ -710,7 +710,7 @@ static inline bool unmap_huge_pmd_locked(struct vm_area_struct *vma, do { } while (0) static inline int hugepage_madvise(struct vm_area_struct *vma, - vm_flags_t *vm_flags, int advice) + vma_flags_t *vma_flags, int advice) { return -EINVAL; } diff --git a/include/linux/ksm.h b/include/linux/ksm.h index d39d0d5483a2..1ffc69a72a1a 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -16,7 +16,7 @@ #ifdef CONFIG_KSM int ksm_madvise(struct vm_area_struct *vma, unsigned long start, - unsigned long end, int advice, vm_flags_t *vm_flags); + unsigned long end, int advice, vma_flags_t *vma_flags); vma_flags_t ksm_vma_flags(struct mm_struct *mm, const struct file *file, vma_flags_t vma_flags); int ksm_enable_merge_any(struct mm_struct *mm); @@ -139,7 +139,7 @@ static inline void collect_procs_ksm(const struct folio *folio, #ifdef CONFIG_MMU static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start, - unsigned long end, int advice, vm_flags_t *vm_flags) + unsigned long end, int advice, vma_flags_t *vma_flags) { return 0; } diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a2c7c6a0768d..be1f779c8da5 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -363,16 +363,16 @@ static unsigned int collapse_max_ptes_swap(struct collapse_control *cc, } int hugepage_madvise(struct vm_area_struct *vma, - vm_flags_t *vm_flags, int advice) + vma_flags_t *vma_flags, int advice) { switch (advice) { case MADV_HUGEPAGE: - *vm_flags &= ~VM_NOHUGEPAGE; - *vm_flags |= VM_HUGEPAGE; + vma_flags_clear(vma_flags, VMA_NOHUGEPAGE_BIT); + vma_flags_set(vma_flags, VMA_HUGEPAGE_BIT); break; case MADV_NOHUGEPAGE: - *vm_flags &= ~VM_HUGEPAGE; - *vm_flags |= VM_NOHUGEPAGE; + vma_flags_clear(vma_flags, VMA_HUGEPAGE_BIT); + vma_flags_set(vma_flags, VMA_NOHUGEPAGE_BIT); /* * Setting VM_NOHUGEPAGE will prevent khugepaged from scanning * this vma even if we leave the mm registered in khugepaged if diff --git a/mm/ksm.c b/mm/ksm.c index 61b772bba229..3eb9c1ec2f87 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -779,7 +779,8 @@ static struct vm_area_struct *find_mergeable_vma(struct mm_struct *mm, if (ksm_test_exit(mm)) return NULL; vma = vma_lookup(mm, addr); - if (!vma || !vma_test(vma, VMA_MERGEABLE_BIT) || !vma_has_anon_rmap(vma)) + if (!vma || !vma_test(vma, VMA_MERGEABLE_BIT) || + !vma_has_anon_rmap(vma)) return NULL; return vma; } @@ -3021,7 +3022,7 @@ int ksm_disable(struct mm_struct *mm) } int ksm_madvise(struct vm_area_struct *vma, unsigned long start, - unsigned long end, int advice, vm_flags_t *vm_flags) + unsigned long end, int advice, vma_flags_t *vma_flags) { struct mm_struct *mm = vma->vm_mm; int err; @@ -3039,11 +3040,11 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start, return err; } - *vm_flags |= VM_MERGEABLE; + vma_flags_set(vma_flags, VMA_MERGEABLE_BIT); break; case MADV_UNMERGEABLE: - if (!(*vm_flags & VM_MERGEABLE)) + if (!vma_flags_test(vma_flags, VMA_MERGEABLE_BIT)) return 0; /* just ignore the advice */ if (vma_has_anon_rmap(vma)) { @@ -3052,7 +3053,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start, return err; } - *vm_flags &= ~VM_MERGEABLE; + vma_flags_clear(vma_flags, VMA_MERGEABLE_BIT); break; } diff --git a/mm/madvise.c b/mm/madvise.c index e9fa4f71efea..1b539e67b00d 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -148,11 +148,10 @@ static int replace_anon_vma_name(struct vm_area_struct *vma, * Update the vm_flags or anon_name on region of a vma, splitting it or merging * it as necessary. Must be called with mmap_lock held for writing. */ -static int madvise_update_vma(vm_flags_t new_flags, +static int madvise_update_vma(vma_flags_t new_vma_flags, struct madvise_behavior *madv_behavior) { struct vm_area_struct *vma = madv_behavior->vma; - vma_flags_t new_vma_flags = legacy_to_vma_flags(new_flags); struct madvise_behavior_range *range = &madv_behavior->range; struct anon_vma_name *anon_name = madv_behavior->anon_name; bool set_new_anon_name = madv_behavior->behavior == __MADV_SET_ANON_VMA_NAME; @@ -601,7 +600,8 @@ static void madvise_cold_page_range(struct mmu_gather *tlb, static inline bool can_madv_lru_vma(struct vm_area_struct *vma) { - return !(vma->vm_flags & (VM_LOCKED|VM_PFNMAP|VM_HUGETLB)); + return !vma_test_any(vma, VMA_LOCKED_BIT, VMA_PFNMAP_BIT, + VMA_HUGETLB_BIT); } static long madvise_cold(struct madvise_behavior *madv_behavior) @@ -650,7 +650,7 @@ static long madvise_pageout(struct madvise_behavior *madv_behavior) * further to pageout dirty anon pages. */ if (!vma_is_anonymous(vma) && (!can_do_file_pageout(vma) && - (vma->vm_flags & VM_MAYSHARE))) + vma_test(vma, VMA_MAYSHARE_BIT))) return 0; lru_add_drain(); @@ -881,12 +881,12 @@ bool madvise_dontneed_free_valid_vma(struct madvise_behavior *madv_behavior) struct madvise_behavior_range *range = &madv_behavior->range; if (!vma_is_hugetlb(vma)) { - unsigned int forbidden = VM_PFNMAP; + vma_flags_t forbidden = mk_vma_flags(VMA_PFNMAP_BIT); if (behavior != MADV_DONTNEED_LOCKED) - forbidden |= VM_LOCKED; + vma_flags_set(&forbidden, VMA_LOCKED_BIT); - return !(vma->vm_flags & forbidden); + return !vma_test_any_mask(vma, forbidden); } if (behavior != MADV_DONTNEED && behavior != MADV_DONTNEED_LOCKED) @@ -1021,7 +1021,7 @@ static long madvise_remove(struct madvise_behavior *madv_behavior) mark_mmap_lock_dropped(madv_behavior); - if (vma->vm_flags & VM_LOCKED) + if (vma_test(vma, VMA_LOCKED_BIT)) return -EINVAL; f = vma->vm_file; @@ -1333,7 +1333,7 @@ static bool can_madvise_modify(struct madvise_behavior *madv_behavior) return true; /* If the user could write to the mapping anyway, then this is fine. */ - if ((vma->vm_flags & VM_WRITE) && + if (vma_test(vma, VMA_WRITE_BIT) && arch_vma_access_permitted(vma, /* write= */ true, /* execute= */ false, /* foreign= */ false)) return true; @@ -1357,7 +1357,7 @@ static int madvise_vma_behavior(struct madvise_behavior *madv_behavior) { int behavior = madv_behavior->behavior; struct vm_area_struct *vma = madv_behavior->vma; - vm_flags_t new_flags = vma->vm_flags; + vma_flags_t new_flags = vma->flags; struct madvise_behavior_range *range = &madv_behavior->range; int error; @@ -1388,44 +1388,47 @@ static int madvise_vma_behavior(struct madvise_behavior *madv_behavior) /* The below behaviours update VMAs via madvise_update_vma(). */ case MADV_NORMAL: - new_flags = new_flags & ~VM_RAND_READ & ~VM_SEQ_READ; + vma_flags_clear(&new_flags, VMA_RAND_READ_BIT, + VMA_SEQ_READ_BIT); break; case MADV_SEQUENTIAL: - new_flags = (new_flags & ~VM_RAND_READ) | VM_SEQ_READ; + vma_flags_clear(&new_flags, VMA_RAND_READ_BIT); + vma_flags_set(&new_flags, VMA_SEQ_READ_BIT); break; case MADV_RANDOM: - new_flags = (new_flags & ~VM_SEQ_READ) | VM_RAND_READ; + vma_flags_clear(&new_flags, VMA_SEQ_READ_BIT); + vma_flags_set(&new_flags, VMA_RAND_READ_BIT); break; case MADV_DONTFORK: - new_flags |= VM_DONTCOPY; + vma_flags_set(&new_flags, VMA_DONTCOPY_BIT); break; case MADV_DOFORK: if (!vma_is_mm_backed(vma) || vma_is_hugetlb(vma)) return -EINVAL; - new_flags &= ~VM_DONTCOPY; + vma_flags_clear(&new_flags, VMA_DONTCOPY_BIT); break; case MADV_WIPEONFORK: /* MADV_WIPEONFORK is only supported on anonymous memory. */ - if (vma->vm_file || new_flags & VM_SHARED) + if (vma->vm_file || vma_flags_test(&new_flags, VMA_SHARED_BIT)) return -EINVAL; - new_flags |= VM_WIPEONFORK; + vma_flags_set(&new_flags, VMA_WIPEONFORK_BIT); break; case MADV_KEEPONFORK: - if (new_flags & VM_DROPPABLE) + if (vma_flags_test_single_mask(&new_flags, VMA_DROPPABLE)) return -EINVAL; - new_flags &= ~VM_WIPEONFORK; + vma_flags_clear(&new_flags, VMA_WIPEONFORK_BIT); break; case MADV_DONTDUMP: - new_flags |= VM_DONTDUMP; + vma_flags_set(&new_flags, VMA_DONTDUMP_BIT); break; case MADV_DODUMP: /* Only mm-backed memory can be meaningfully dumped. */ if (!vma_is_mm_backed(vma)) return -EINVAL; /* Core mm may discard droppable memory at any time. */ - if (new_flags & VM_DROPPABLE) + if (vma_flags_test_single_mask(&new_flags, VMA_DROPPABLE)) return -EINVAL; - new_flags &= ~VM_DONTDUMP; + vma_flags_clear(&new_flags, VMA_DONTDUMP_BIT); break; case MADV_MERGEABLE: case MADV_UNMERGEABLE: diff --git a/mm/mremap.c b/mm/mremap.c index 0d06d7f37f19..5f4e7d1ce3b7 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -1133,7 +1133,7 @@ static unsigned long prep_move_vma(struct vma_remap_struct *vrm) struct vm_area_struct *vma = vrm->vma; unsigned long old_addr = vrm->addr; unsigned long old_len = vrm->old_len; - vm_flags_t dummy = vma->vm_flags; + vma_flags_t dummy = vma->flags; const bool split_before = vma->vm_start != old_addr; const bool split_after = vma->vm_end != old_addr + old_len; -- 2.56.0
