diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index e09159c957e3..a1baa198519a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1037,8 +1037,10 @@ void clear_vma_resv_huge_pages(struct vm_area_struct *vma) */ struct resv_map *reservations = vma_resv_map(vma); - if (reservations && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) + if (reservations && is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { + resv_map_put_hugetlb_cgroup_uncharge_info(reservations); kref_put(&reservations->refs, resv_map_release); + } reset_vma_resv_huge_pages(vma); } @@ -2971,7 +2973,7 @@ int __alloc_bootmem_huge_page(struct hstate *h, int nid) struct huge_bootmem_page *m = NULL; /* initialize for clang */ int nr_nodes, node; - if (nid >= nr_online_nodes) + if (nid != NUMA_NO_NODE && nid >= nr_online_nodes) return 0; /* do node specific alloc */ if (nid != NUMA_NO_NODE) { @@ -4917,9 +4919,9 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma, move_huge_pte(vma, old_addr, new_addr, src_pte); } - i_mmap_unlock_write(mapping); flush_tlb_range(vma, old_end - len, old_end); mmu_notifier_invalidate_range_end(&range); + i_mmap_unlock_write(mapping); return len + old_addr - old_end; } @@ -4937,6 +4939,7 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct struct hstate *h = hstate_vma(vma); unsigned long sz = huge_page_size(h); struct mmu_notifier_range range; + bool force_flush = false; WARN_ON(!is_vm_hugetlb_page(vma)); BUG_ON(start & ~huge_page_mask(h)); @@ -4965,10 +4968,8 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct ptl = huge_pte_lock(h, mm, ptep); if (huge_pmd_unshare(mm, vma, &address, ptep)) { spin_unlock(ptl); - /* - * We just unmapped a page of PMDs by clearing a PUD. - * The caller's TLB flush range should cover this area. - */ + tlb_flush_pmd_range(tlb, address & PUD_MASK, PUD_SIZE); + force_flush = true; continue; } @@ -5025,6 +5026,22 @@ static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct } mmu_notifier_invalidate_range_end(&range); tlb_end_vma(tlb, vma); + + /* + * If we unshared PMDs, the TLB flush was not recorded in mmu_gather. We + * could defer the flush until now, since by holding i_mmap_rwsem we + * guaranteed that the last refernece would not be dropped. But we must + * do the flushing before we return, as otherwise i_mmap_rwsem will be + * dropped and the last reference to the shared PMDs page might be + * dropped as well. + * + * In theory we could defer the freeing of the PMD pages as well, but + * huge_pmd_unshare() relies on the exact page_count for the PMD page to + * detect sharing, so we cannot defer the release of the page either. + * Instead, do flush now. + */ + if (force_flush) + tlb_flush_mmu_tlbonly(tlb); } void __unmap_hugepage_range_final(struct mmu_gather *tlb, @@ -5734,13 +5751,14 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, int ret = -ENOMEM; struct page *page; int writable; - bool new_pagecache_page = false; + bool page_in_pagecache = false; if (is_continue) { ret = -EFAULT; page = find_lock_page(mapping, idx); if (!page) goto out; + page_in_pagecache = true; } else if (!*pagep) { /* If a page already exists, then it's UFFDIO_COPY for * a non-missing case. Return -EEXIST. @@ -5828,7 +5846,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, ret = huge_add_to_page_cache(page, mapping, idx); if (ret) goto out_release_nounlock; - new_pagecache_page = true; + page_in_pagecache = true; } ptl = huge_pte_lockptr(h, dst_mm, dst_pte); @@ -5892,7 +5910,7 @@ out_release_unlock: if (vm_shared || is_continue) unlock_page(page); out_release_nounlock: - if (!new_pagecache_page) + if (!page_in_pagecache) restore_reserve_on_error(h, dst_vma, dst_addr, page); put_page(page); goto out; |