6 files changed, 46 insertions, 59 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bbf953eeb58b..ab171274ef21 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -785,7 +785,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
                         continue;
 
                 spin_lock(&dst->page_table_lock);
-                spin_lock(&src->page_table_lock);
+                spin_lock_nested(&src->page_table_lock, SINGLE_DEPTH_NESTING);
                 if (!huge_pte_none(huge_ptep_get(src_pte))) {
                         if (cow)
                                 huge_ptep_set_wrprotect(src, addr, src_pte);
diff --git a/mm/mmap.c b/mm/mmap.c
index 669499e7c2f5..3354fdd83d4b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -245,10 +245,16 @@ asmlinkage unsigned long sys_brk(unsigned long brk)
         unsigned long rlim, retval;
         unsigned long newbrk, oldbrk;
         struct mm_struct *mm = current->mm;
+        unsigned long min_brk;
 
         down_write(&mm->mmap_sem);
 
-        if (brk < mm->start_brk)
+#ifdef CONFIG_COMPAT_BRK
+        min_brk = mm->end_code;
+#else
+        min_brk = mm->start_brk;
+#endif
+        if (brk < min_brk)
                 goto out;
 
         /*
diff --git a/mm/nommu.c b/mm/nommu.c
index dca93fcb8b7a..4462b6a3fcb9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -109,16 +109,23 @@ unsigned int kobjsize(const void *objp)
          * If the object we have should not have ksize performed on it,
          * return size of 0
          */
-        if (!objp || (unsigned long)objp >= memory_end || !((page = virt_to_page(objp))))
+        if (!objp || !virt_addr_valid(objp))
                 return 0;
 
+        page = virt_to_head_page(objp);
+
+        /*
+         * If the allocator sets PageSlab, we know the pointer came from
+         * kmalloc().
+         */
         if (PageSlab(page))
                 return ksize(objp);
 
-        BUG_ON(page->index < 0);
-        BUG_ON(page->index >= MAX_ORDER);
-
-        return (PAGE_SIZE << page->index);
+        /*
+         * The ksize() function is only guaranteed to work for pointers
+         * returned by kmalloc(). So handle arbitrary pointers here.
+         */
+        return PAGE_SIZE << compound_order(page);
 }
 
 /*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8e83f02cd2d3..2f552955a02f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -237,16 +237,7 @@ static void bad_page(struct page *page)
         printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
                 KERN_EMERG "Backtrace:\n");
         dump_stack();
-        page->flags &= ~(1 << PG_lru    |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_dirty   |
-                        1 << PG_reclaim |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_buddy );
+        page->flags &= ~PAGE_FLAGS_CLEAR_WHEN_BAD;
         set_page_count(page, 0);
         reset_page_mapcount(page);
         page->mapping = NULL;
@@ -463,16 +454,7 @@ static inline int free_pages_check(struct page *page)
                 (page->mapping != NULL)  |
                 (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
-                (page->flags & (
-                        1 << PG_lru     |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_reserved |
-                        1 << PG_buddy ))))
+                (page->flags & PAGE_FLAGS_CHECK_AT_FREE)))
                 bad_page(page);
         if (PageDirty(page))
                 __ClearPageDirty(page);
@@ -616,17 +598,7 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
                 (page->mapping != NULL)  |
                 (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
-                (page->flags & (
-                        1 << PG_lru     |
-                        1 << PG_private |
-                        1 << PG_locked  |
-                        1 << PG_active  |
-                        1 << PG_dirty   |
-                        1 << PG_slab    |
-                        1 << PG_swapcache |
-                        1 << PG_writeback |
-                        1 << PG_reserved |
-                        1 << PG_buddy ))))
+                (page->flags & PAGE_FLAGS_CHECK_AT_PREP)))
                 bad_page(page);
 
         /*
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 0afd2387e507..d5878bed7841 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -3,14 +3,14 @@
 #include <linux/sched.h>
 
 static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
-                          const struct mm_walk *walk, void *private)
+                          struct mm_walk *walk)
 {
         pte_t *pte;
         int err = 0;
 
         pte = pte_offset_map(pmd, addr);
         for (;;) {
-                err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, private);
+                err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
                 if (err)
                        break;
                 addr += PAGE_SIZE;
@@ -24,7 +24,7 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 }
 
 static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
-                          const struct mm_walk *walk, void *private)
+                          struct mm_walk *walk)
 {
         pmd_t *pmd;
         unsigned long next;
@@ -35,15 +35,15 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
                 next = pmd_addr_end(addr, end);
                 if (pmd_none_or_clear_bad(pmd)) {
                         if (walk->pte_hole)
-                                err = walk->pte_hole(addr, next, private);
+                                err = walk->pte_hole(addr, next, walk);
                         if (err)
                                 break;
                         continue;
                 }
                 if (walk->pmd_entry)
-                        err = walk->pmd_entry(pmd, addr, next, private);
+                        err = walk->pmd_entry(pmd, addr, next, walk);
                 if (!err && walk->pte_entry)
-                        err = walk_pte_range(pmd, addr, next, walk, private);
+                        err = walk_pte_range(pmd, addr, next, walk);
                 if (err)
                         break;
         } while (pmd++, addr = next, addr != end);
@@ -52,7 +52,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
 }
 
 static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
-                          const struct mm_walk *walk, void *private)
+                          struct mm_walk *walk)
 {
         pud_t *pud;
         unsigned long next;
@@ -63,15 +63,15 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
                 next = pud_addr_end(addr, end);
                 if (pud_none_or_clear_bad(pud)) {
                         if (walk->pte_hole)
-                                err = walk->pte_hole(addr, next, private);
+                                err = walk->pte_hole(addr, next, walk);
                         if (err)
                                 break;
                         continue;
                 }
                 if (walk->pud_entry)
-                        err = walk->pud_entry(pud, addr, next, private);
+                        err = walk->pud_entry(pud, addr, next, walk);
                 if (!err && (walk->pmd_entry || walk->pte_entry))
-                        err = walk_pmd_range(pud, addr, next, walk, private);
+                        err = walk_pmd_range(pud, addr, next, walk);
                 if (err)
                         break;
         } while (pud++, addr = next, addr != end);
@@ -85,15 +85,15 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
  * @addr: starting address
  * @end: ending address
  * @walk: set of callbacks to invoke for each level of the tree
- * @private: private data passed to the callback function
  *
  * Recursively walk the page table for the memory area in a VMA,
  * calling supplied callbacks. Callbacks are called in-order (first
  * PGD, first PUD, first PMD, first PTE, second PTE... second PMD,
  * etc.). If lower-level callbacks are omitted, walking depth is reduced.
  *
- * Each callback receives an entry pointer, the start and end of the
- * associated range, and a caller-supplied private data pointer.
+ * Each callback receives an entry pointer and the start and end of the
+ * associated range, and a copy of the original mm_walk for access to
+ * the ->private or ->mm fields.
  *
  * No locks are taken, but the bottom level iterator will map PTE
  * directories from highmem if necessary.
@@ -101,9 +101,8 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
  * If any callback returns a non-zero value, the walk is aborted and
  * the return value is propagated back to the caller. Otherwise 0 is returned.
  */
-int walk_page_range(const struct mm_struct *mm,
-                    unsigned long addr, unsigned long end,
-                    const struct mm_walk *walk, void *private)
+int walk_page_range(unsigned long addr, unsigned long end,
+                    struct mm_walk *walk)
 {
         pgd_t *pgd;
         unsigned long next;
@@ -112,21 +111,24 @@ int walk_page_range(const struct mm_struct *mm,
         if (addr >= end)
                 return err;
 
-        pgd = pgd_offset(mm, addr);
+        if (!walk->mm)
+                return -EINVAL;
+
+        pgd = pgd_offset(walk->mm, addr);
         do {
                 next = pgd_addr_end(addr, end);
                 if (pgd_none_or_clear_bad(pgd)) {
                         if (walk->pte_hole)
-                                err = walk->pte_hole(addr, next, private);
+                                err = walk->pte_hole(addr, next, walk);
                         if (err)
                                 break;
                         continue;
                 }
                 if (walk->pgd_entry)
-                        err = walk->pgd_entry(pgd, addr, next, private);
+                        err = walk->pgd_entry(pgd, addr, next, walk);
                 if (!err &&
                     (walk->pud_entry || walk->pmd_entry || walk->pte_entry))
-                        err = walk_pud_range(pgd, addr, next, walk, private);
+                        err = walk_pud_range(pgd, addr, next, walk);
                 if (err)
                         break;
         } while (pgd++, addr = next, addr != end);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9a29901ad3b3..967d30ccd92b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1307,7 +1307,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                                         struct scan_control *sc)
 {
         int priority;
-        int ret = 0;
+        unsigned long ret = 0;
         unsigned long total_scanned = 0;
         unsigned long nr_reclaimed = 0;
         struct reclaim_state *reclaim_state = current->reclaim_state;