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>

2 files changed, 16 insertions, 34 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;
 
diff --git a/mm/memory.c b/mm/memory.c
index 990e7dc666f8..74f95ae0510b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1146,6 +1146,18 @@ int zeromap_page_range(struct vm_area_struct *vma,
         return err;
 }
 
+pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl)
+{
+        pgd_t * pgd = pgd_offset(mm, addr);
+        pud_t * pud = pud_alloc(mm, pgd, addr);
+        if (pud) {
+                pmd_t * pmd = pmd_alloc(mm, pgd, addr);
+                if (pmd)
+                        return pte_alloc_map_lock(mm, pmd, addr, ptl);
+        }
+        return NULL;
+}
+
 /*
  * This is the old fallback for page remapping.
  *
@@ -1156,10 +1168,7 @@ int zeromap_page_range(struct vm_area_struct *vma,
 static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *page, pgprot_t prot)
 {
         int retval;
-        pgd_t * pgd;
-        pud_t * pud;
-        pmd_t * pmd;  
-        pte_t * pte;
+        pte_t *pte;
         spinlock_t *ptl;  
 
         retval = -EINVAL;
@@ -1167,14 +1176,7 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa
                 goto out;
         retval = -ENOMEM;
         flush_dcache_page(page);
-        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;
         retval = -EBUSY;