Merge tag 'v3.10.78' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / mm / mempolicy.c

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 74310017296ee02317b79a2c28b25ef303fc7720..420e4b97ffab5853d6e543080c612b341a171ce3 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -608,19 +608,18 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
  * If pagelist != NULL then isolate pages from the LRU and
  * put them on the pagelist.
  */
-static struct vm_area_struct *
+static int
 check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
                const nodemask_t *nodes, unsigned long flags, void *private)
 {
-       int err;
-       struct vm_area_struct *first, *vma, *prev;
-
+       int err = 0;
+       struct vm_area_struct *vma, *prev;
 
-       first = find_vma(mm, start);
-       if (!first)
-               return ERR_PTR(-EFAULT);
+       vma = find_vma(mm, start);
+       if (!vma)
+               return -EFAULT;
        prev = NULL;
-       for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) {
+       for (; vma && vma->vm_start < end; vma = vma->vm_next) {
                unsigned long endvma = vma->vm_end;
 
                if (endvma > end)
@@ -630,9 +629,9 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 
                if (!(flags & MPOL_MF_DISCONTIG_OK)) {
                        if (!vma->vm_next && vma->vm_end < end)
-                               return ERR_PTR(-EFAULT);
+                               return -EFAULT;
                        if (prev && prev->vm_end < vma->vm_start)
-                               return ERR_PTR(-EFAULT);
+                               return -EFAULT;
                }
 
                if (is_vm_hugetlb_page(vma))
@@ -649,15 +648,13 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 
                        err = check_pgd_range(vma, start, endvma, nodes,
                                                flags, private);
-                       if (err) {
-                               first = ERR_PTR(err);
+                       if (err)
                                break;
-                       }
                }
 next:
                prev = vma;
        }
-       return first;
+       return err;
 }
 
 /*
@@ -728,11 +725,14 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
                        ((vmstart - vma->vm_start) >> PAGE_SHIFT);
                prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags,
                                  vma->anon_vma, vma->vm_file, pgoff,
-                                 new_pol);
+                                 new_pol, vma_get_anon_name(vma));
                if (prev) {
                        vma = prev;
                        next = vma->vm_next;
-                       continue;
+                       if (mpol_equal(vma_policy(vma), new_pol))
+                               continue;
+                       /* vma_merge() joined vma && vma->next, case 8 */
+                       goto replace;
                }
                if (vma->vm_start != vmstart) {
                        err = split_vma(vma->vm_mm, vma, vmstart, 1);
@@ -744,6 +744,7 @@ static int mbind_range(struct mm_struct *mm, unsigned long start,
                        if (err)
                                goto out;
                }
+ replace:
                err = vma_replace_policy(vma, new_pol);
                if (err)
                        goto out;
@@ -1134,16 +1135,17 @@ out:
 
 /*
  * Allocate a new page for page migration based on vma policy.
- * Start assuming that page is mapped by vma pointed to by @private.
+ * Start by assuming the page is mapped by the same vma as contains @start.
  * Search forward from there, if not.  N.B., this assumes that the
  * list of pages handed to migrate_pages()--which is how we get here--
  * is in virtual address order.
  */
-static struct page *new_vma_page(struct page *page, unsigned long private, int **x)
+static struct page *new_page(struct page *page, unsigned long start, int **x)
 {
-       struct vm_area_struct *vma = (struct vm_area_struct *)private;
+       struct vm_area_struct *vma;
        unsigned long uninitialized_var(address);
 
+       vma = find_vma(current->mm, start);
        while (vma) {
                address = page_address_in_vma(page, vma);
                if (address != -EFAULT)
@@ -1169,7 +1171,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
        return -ENOSYS;
 }
 
-static struct page *new_vma_page(struct page *page, unsigned long private, int **x)
+static struct page *new_page(struct page *page, unsigned long start, int **x)
 {
        return NULL;
 }
@@ -1179,7 +1181,6 @@ static long do_mbind(unsigned long start, unsigned long len,
                     unsigned short mode, unsigned short mode_flags,
                     nodemask_t *nmask, unsigned long flags)
 {
-       struct vm_area_struct *vma;
        struct mm_struct *mm = current->mm;
        struct mempolicy *new;
        unsigned long end;
@@ -1245,11 +1246,9 @@ static long do_mbind(unsigned long start, unsigned long len,
        if (err)
                goto mpol_out;
 
-       vma = check_range(mm, start, end, nmask,
+       err = check_range(mm, start, end, nmask,
                          flags | MPOL_MF_INVERT, &pagelist);
-
-       err = PTR_ERR(vma);     /* maybe ... */
-       if (!IS_ERR(vma))
+       if (!err)
                err = mbind_range(mm, start, end, new);
 
        if (!err) {
@@ -1257,9 +1256,8 @@ static long do_mbind(unsigned long start, unsigned long len,
 
                if (!list_empty(&pagelist)) {
                        WARN_ON_ONCE(flags & MPOL_MF_LAZY);
-                       nr_failed = migrate_pages(&pagelist, new_vma_page,
-                                       (unsigned long)vma,
-                                       MIGRATE_SYNC, MR_MEMPOLICY_MBIND);
+                       nr_failed = migrate_pages(&pagelist, new_page,
+                               start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND);
                        if (nr_failed)
                                putback_lru_pages(&pagelist);
                }
@@ -2088,7 +2086,6 @@ struct mempolicy *__mpol_dup(struct mempolicy *old)
        } else
                *new = *old;
 
-       rcu_read_lock();
        if (current_cpuset_is_being_rebound()) {
                nodemask_t mems = cpuset_mems_allowed(current);
                if (new->flags & MPOL_F_REBINDING)
@@ -2096,7 +2093,6 @@ struct mempolicy *__mpol_dup(struct mempolicy *old)
                else
                        mpol_rebind_policy(new, &mems, MPOL_REBIND_ONCE);
        }
-       rcu_read_unlock();
        atomic_set(&new->refcnt, 1);
        return new;
 }
@@ -2797,7 +2793,7 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
         */
        VM_BUG_ON(maxlen < strlen("interleave") + strlen("relative") + 16);
 
-       if (!pol || pol == &default_policy)
+       if (!pol || pol == &default_policy || (pol->flags & MPOL_F_MORON))
                mode = MPOL_DEFAULT;
        else
                mode = pol->mode;