diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 20117a4b8ab6..783098f6cf8e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -565,3 +565,32 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, return i; } + +void hugetlb_change_protection(struct vm_area_struct *vma, + unsigned long address, unsigned long end, pgprot_t newprot) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned long start = address; + pte_t *ptep; + pte_t pte; + + BUG_ON(address >= end); + flush_cache_range(vma, address, end); + + spin_lock(&mm->page_table_lock); + for (; address < end; address += HPAGE_SIZE) { + ptep = huge_pte_offset(mm, address); + if (!ptep) + continue; + if (!pte_none(*ptep)) { + pte = huge_ptep_get_and_clear(mm, address, ptep); + pte = pte_mkhuge(pte_modify(pte, newprot)); + set_huge_pte_at(mm, address, ptep, pte); + lazy_mmu_prot_update(pte); + } + } + spin_unlock(&mm->page_table_lock); + + flush_tlb_range(vma, start, end); +} + |