page_alloc: remove unused find_zone_movable_pfns_for_nodes() argument
[linux-3.10.git] / mm / mprotect.c
index 9402080..c621e99 100644 (file)
@@ -60,7 +60,7 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
                                ptent = pte_mkwrite(ptent);
 
                        ptep_modify_prot_commit(mm, addr, pte, ptent);
-               } else if (PAGE_MIGRATION && !pte_file(oldpte)) {
+               } else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
                        swp_entry_t entry = pte_to_swp_entry(oldpte);
 
                        if (is_write_migration_entry(entry)) {
@@ -88,7 +88,13 @@ static inline void change_pmd_range(struct vm_area_struct *vma, pud_t *pud,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
-               split_huge_page_pmd(vma->vm_mm, pmd);
+               if (pmd_trans_huge(*pmd)) {
+                       if (next - addr != HPAGE_PMD_SIZE)
+                               split_huge_page_pmd(vma->vm_mm, pmd);
+                       else if (change_huge_pmd(vma, pmd, addr, newprot))
+                               continue;
+                       /* fall through */
+               }
                if (pmd_none_or_clear_bad(pmd))
                        continue;
                change_pte_range(vma->vm_mm, pmd, addr, next, newprot,
@@ -256,10 +262,11 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
 
        down_write(&current->mm->mmap_sem);
 
-       vma = find_vma_prev(current->mm, start, &prev);
+       vma = find_vma(current->mm, start);
        error = -ENOMEM;
        if (!vma)
                goto out;
+       prev = vma->vm_prev;
        if (unlikely(grows & PROT_GROWSDOWN)) {
                if (vma->vm_start >= end)
                        goto out;