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-rw-r--r--mm/hugetlb.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f7355bf2f28..9244971b679 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -386,6 +386,9 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
if (!ptep)
continue;
+ if (huge_pmd_unshare(mm, &address, ptep))
+ continue;
+
pte = huge_ptep_get_and_clear(mm, address, ptep);
if (pte_none(pte))
continue;
@@ -658,11 +661,14 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
BUG_ON(address >= end);
flush_cache_range(vma, address, end);
+ spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
spin_lock(&mm->page_table_lock);
for (; address < end; address += HPAGE_SIZE) {
ptep = huge_pte_offset(mm, address);
if (!ptep)
continue;
+ if (huge_pmd_unshare(mm, &address, ptep))
+ continue;
if (!pte_none(*ptep)) {
pte = huge_ptep_get_and_clear(mm, address, ptep);
pte = pte_mkhuge(pte_modify(pte, newprot));
@@ -671,6 +677,7 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
}
}
spin_unlock(&mm->page_table_lock);
+ spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
flush_tlb_range(vma, start, end);
}