VM: add common helper function to create the page tables

This logic was duplicated four times, for no good reason.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 22 deletions

diff --git a/mm/fremap.c b/mm/fremap.c
index f851775e09c2..9f381e58bf44 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -55,20 +55,10 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
         pgoff_t size;
         int err = -ENOMEM;
         pte_t *pte;
-        pmd_t *pmd;
-        pud_t *pud;
-        pgd_t *pgd;
         pte_t pte_val;
         spinlock_t *ptl;
 
-        pgd = pgd_offset(mm, addr);
-        pud = pud_alloc(mm, pgd, addr);
-        if (!pud)
-                goto out;
-        pmd = pmd_alloc(mm, pud, addr);
-        if (!pmd)
-                goto out;
-        pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
+        pte = get_locked_pte(mm, addr, &ptl);
         if (!pte)
                 goto out;
 
@@ -110,20 +100,10 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 {
         int err = -ENOMEM;
         pte_t *pte;
-        pmd_t *pmd;
-        pud_t *pud;
-        pgd_t *pgd;
         pte_t pte_val;
         spinlock_t *ptl;
 
-        pgd = pgd_offset(mm, addr);
-        pud = pud_alloc(mm, pgd, addr);
-        if (!pud)
-                goto out;
-        pmd = pmd_alloc(mm, pud, addr);
-        if (!pmd)
-                goto out;
-        pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
+        pte = get_locked_pte(mm, addr, &ptl);
         if (!pte)
                 goto out;