Merge branch 'akpm' (Andrew's patchbomb)

Merge misc updates from Andrew Morton:
 "About half of most of MM.  Going very early this time due to
  uncertainty over the coreautounifiednumasched things.  I'll send the
  other half of most of MM tomorrow.  The rest of MM awaits a slab merge
  from Pekka."

* emailed patches from Andrew Morton: (71 commits)
  memory_hotplug: ensure every online node has NORMAL memory
  memory_hotplug: handle empty zone when online_movable/online_kernel
  mm, memory-hotplug: dynamic configure movable memory and portion memory
  drivers/base/node.c: cleanup node_state_attr[]
  bootmem: fix wrong call parameter for free_bootmem()
  avr32, kconfig: remove HAVE_ARCH_BOOTMEM
  mm: cma: remove watermark hacks
  mm: cma: skip watermarks check for already isolated blocks in split_free_page()
  mm, oom: fix race when specifying a thread as the oom origin
  mm, oom: change type of oom_score_adj to short
  mm: cleanup register_node()
  mm, mempolicy: remove duplicate code
  mm/vmscan.c: try_to_freeze() returns boolean
  mm: introduce putback_movable_pages()
  virtio_balloon: introduce migration primitives to balloon pages
  mm: introduce compaction and migration for ballooned pages
  mm: introduce a common interface for balloon pages mobility
  mm: redefine address_space.assoc_mapping
  mm: adjust address_space_operations.migratepage() return code
  arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
  ...

3 files changed, 72 insertions, 229 deletions

diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 0c9b31b22e07..57277c830151 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -34,11 +34,9 @@ asmlinkage unsigned long sys_getpagesize(void)
         return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
 }
 
-#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
-
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
-        struct vm_area_struct * vmm;
+        struct vm_unmapped_area_info info;
 
         if (flags & MAP_FIXED) {
                 /* We do not accept a shared mapping if it would violate
@@ -56,21 +54,14 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
         if (!addr)
                 addr = TASK_UNMAPPED_BASE;
 
-        if (flags & MAP_SHARED)
-                addr = COLOUR_ALIGN(addr);
-        else
-                addr = PAGE_ALIGN(addr);
-
-        for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
-                /* At this point:  (!vmm || addr < vmm->vm_end). */
-                if (TASK_SIZE - PAGE_SIZE - len < addr)
-                        return -ENOMEM;
-                if (!vmm || addr + len <= vmm->vm_start)
-                        return addr;
-                addr = vmm->vm_end;
-                if (flags & MAP_SHARED)
-                        addr = COLOUR_ALIGN(addr);
-        }
+        info.flags = 0;
+        info.length = len;
+        info.low_limit = addr;
+        info.high_limit = TASK_SIZE;
+        info.align_mask = (flags & MAP_SHARED) ?
+                (PAGE_MASK & (SHMLBA - 1)) : 0;
+        info.align_offset = pgoff << PAGE_SHIFT;
+        return vm_unmapped_area(&info);
 }
 
 /*
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 878ef3d5fec5..97309c0ec533 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -75,7 +75,7 @@ static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
  *    the spitfire/niagara VA-hole.
  */
 
-static inline unsigned long COLOUR_ALIGN(unsigned long addr,
+static inline unsigned long COLOR_ALIGN(unsigned long addr,
                                          unsigned long pgoff)
 {
         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
@@ -84,24 +84,13 @@ static inline unsigned long COLOUR_ALIGN(unsigned long addr,
         return base + off;
 }
 
-static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
-                                              unsigned long pgoff)
-{
-        unsigned long base = addr & ~(SHMLBA-1);
-        unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
-
-        if (base + off <= addr)
-                return base + off;
-        return base - off;
-}
-
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
 {
         struct mm_struct *mm = current->mm;
         struct vm_area_struct * vma;
         unsigned long task_size = TASK_SIZE;
-        unsigned long start_addr;
         int do_color_align;
+        struct vm_unmapped_area_info info;
 
         if (flags & MAP_FIXED) {
                 /* We do not accept a shared mapping if it would violate
@@ -124,7 +113,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
 
         if (addr) {
                 if (do_color_align)
-                        addr = COLOUR_ALIGN(addr, pgoff);
+                        addr = COLOR_ALIGN(addr, pgoff);
                 else
                         addr = PAGE_ALIGN(addr);
 
@@ -134,50 +123,22 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
                         return addr;
         }
 
-        if (len > mm->cached_hole_size) {
-                start_addr = addr = mm->free_area_cache;
-        } else {
-                start_addr = addr = TASK_UNMAPPED_BASE;
-                mm->cached_hole_size = 0;
+        info.flags = 0;
+        info.length = len;
+        info.low_limit = TASK_UNMAPPED_BASE;
+        info.high_limit = min(task_size, VA_EXCLUDE_START);
+        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+        info.align_offset = pgoff << PAGE_SHIFT;
+        addr = vm_unmapped_area(&info);
+
+        if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
+                VM_BUG_ON(addr != -ENOMEM);
+                info.low_limit = VA_EXCLUDE_END;
+                info.high_limit = task_size;
+                addr = vm_unmapped_area(&info);
         }
 
-        task_size -= len;
-
-full_search:
-        if (do_color_align)
-                addr = COLOUR_ALIGN(addr, pgoff);
-        else
-                addr = PAGE_ALIGN(addr);
-
-        for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-                /* At this point:  (!vma || addr < vma->vm_end). */
-                if (addr < VA_EXCLUDE_START &&
-                    (addr + len) >= VA_EXCLUDE_START) {
-                        addr = VA_EXCLUDE_END;
-                        vma = find_vma(mm, VA_EXCLUDE_END);
-                }
-                if (unlikely(task_size < addr)) {
-                        if (start_addr != TASK_UNMAPPED_BASE) {
-                                start_addr = addr = TASK_UNMAPPED_BASE;
-                                mm->cached_hole_size = 0;
-                                goto full_search;
-                        }
-                        return -ENOMEM;
-                }
-                if (likely(!vma || addr + len <= vma->vm_start)) {
-                        /*
-                         * Remember the place where we stopped the search:
-                         */
-                        mm->free_area_cache = addr + len;
-                        return addr;
-                }
-                if (addr + mm->cached_hole_size < vma->vm_start)
-                        mm->cached_hole_size = vma->vm_start - addr;
-
-                addr = vma->vm_end;
-                if (do_color_align)
-                        addr = COLOUR_ALIGN(addr, pgoff);
-        }
+        return addr;
 }
 
 unsigned long
@@ -190,6 +151,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         unsigned long task_size = STACK_TOP32;
         unsigned long addr = addr0;
         int do_color_align;
+        struct vm_unmapped_area_info info;
 
         /* This should only ever run for 32-bit processes.  */
         BUG_ON(!test_thread_flag(TIF_32BIT));
@@ -214,7 +176,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         /* requesting a specific address */
         if (addr) {
                 if (do_color_align)
-                        addr = COLOUR_ALIGN(addr, pgoff);
+                        addr = COLOR_ALIGN(addr, pgoff);
                 else
                         addr = PAGE_ALIGN(addr);
 
@@ -224,73 +186,27 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
                         return addr;
         }
 
-        /* check if free_area_cache is useful for us */
-        if (len <= mm->cached_hole_size) {
-                mm->cached_hole_size = 0;
-                mm->free_area_cache = mm->mmap_base;
-        }
-
-        /* either no address requested or can't fit in requested address hole */
-        addr = mm->free_area_cache;
-        if (do_color_align) {
-                unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
+        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+        info.length = len;
+        info.low_limit = PAGE_SIZE;
+        info.high_limit = mm->mmap_base;
+        info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+        info.align_offset = pgoff << PAGE_SHIFT;
+        addr = vm_unmapped_area(&info);
 
-                addr = base + len;
-        }
-
-        /* make sure it can fit in the remaining address space */
-        if (likely(addr > len)) {
-                vma = find_vma(mm, addr-len);
-                if (!vma || addr <= vma->vm_start) {
-                        /* remember the address as a hint for next time */
-                        return (mm->free_area_cache = addr-len);
-                }
-        }
-
-        if (unlikely(mm->mmap_base < len))
-                goto bottomup;
-
-        addr = mm->mmap_base-len;
-        if (do_color_align)
-                addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-
-        do {
-                /*
-                 * Lookup failure means no vma is above this address,
-                 * else if new region fits below vma->vm_start,
-                 * return with success:
-                 */
-                vma = find_vma(mm, addr);
-                if (likely(!vma || addr+len <= vma->vm_start)) {
-                        /* remember the address as a hint for next time */
-                        return (mm->free_area_cache = addr);
-                }
-
-                /* remember the largest hole we saw so far */
-                if (addr + mm->cached_hole_size < vma->vm_start)
-                        mm->cached_hole_size = vma->vm_start - addr;
-
-                /* try just below the current vma->vm_start */
-                addr = vma->vm_start-len;
-                if (do_color_align)
-                        addr = COLOUR_ALIGN_DOWN(addr, pgoff);
-        } while (likely(len < vma->vm_start));
-
-bottomup:
         /*
          * A failed mmap() very likely causes application failure,
          * so fall back to the bottom-up function here. This scenario
          * can happen with large stack limits and large mmap()
          * allocations.
          */
-        mm->cached_hole_size = ~0UL;
-        mm->free_area_cache = TASK_UNMAPPED_BASE;
-        addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
-        /*
-         * Restore the topdown base:
-         */
-        mm->free_area_cache = mm->mmap_base;
-        mm->cached_hole_size = ~0UL;
+        if (addr & ~PAGE_MASK) {
+                VM_BUG_ON(addr != -ENOMEM);
+                info.flags = 0;
+                info.low_limit = TASK_UNMAPPED_BASE;
+                info.high_limit = STACK_TOP32;
+                addr = vm_unmapped_area(&info);
+        }
 
         return addr;
 }
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index f76f83d5ac63..d2b59441ebdd 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -30,55 +30,28 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
                                                         unsigned long pgoff,
                                                         unsigned long flags)
 {
-        struct mm_struct *mm = current->mm;
-        struct vm_area_struct * vma;
         unsigned long task_size = TASK_SIZE;
-        unsigned long start_addr;
+        struct vm_unmapped_area_info info;
 
         if (test_thread_flag(TIF_32BIT))
                 task_size = STACK_TOP32;
-        if (unlikely(len >= VA_EXCLUDE_START))
-                return -ENOMEM;
 
-        if (len > mm->cached_hole_size) {
-                start_addr = addr = mm->free_area_cache;
-        } else {
-                start_addr = addr = TASK_UNMAPPED_BASE;
-                mm->cached_hole_size = 0;
+        info.flags = 0;
+        info.length = len;
+        info.low_limit = TASK_UNMAPPED_BASE;
+        info.high_limit = min(task_size, VA_EXCLUDE_START);
+        info.align_mask = PAGE_MASK & ~HPAGE_MASK;
+        info.align_offset = 0;
+        addr = vm_unmapped_area(&info);
+
+        if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
+                VM_BUG_ON(addr != -ENOMEM);
+                info.low_limit = VA_EXCLUDE_END;
+                info.high_limit = task_size;
+                addr = vm_unmapped_area(&info);
         }
 
-        task_size -= len;
-
-full_search:
-        addr = ALIGN(addr, HPAGE_SIZE);
-
-        for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-                /* At this point:  (!vma || addr < vma->vm_end). */
-                if (addr < VA_EXCLUDE_START &&
-                    (addr + len) >= VA_EXCLUDE_START) {
-                        addr = VA_EXCLUDE_END;
-                        vma = find_vma(mm, VA_EXCLUDE_END);
-                }
-                if (unlikely(task_size < addr)) {
-                        if (start_addr != TASK_UNMAPPED_BASE) {
-                                start_addr = addr = TASK_UNMAPPED_BASE;
-                                mm->cached_hole_size = 0;
-                                goto full_search;
-                        }
-                        return -ENOMEM;
-                }
-                if (likely(!vma || addr + len <= vma->vm_start)) {
-                        /*
-                         * Remember the place where we stopped the search:
-                         */
-                        mm->free_area_cache = addr + len;
-                        return addr;
-                }
-                if (addr + mm->cached_hole_size < vma->vm_start)
-                        mm->cached_hole_size = vma->vm_start - addr;
-
-                addr = ALIGN(vma->vm_end, HPAGE_SIZE);
-        }
+        return addr;
 }
 
 static unsigned long
@@ -87,71 +60,34 @@ hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
                                   const unsigned long pgoff,
                                   const unsigned long flags)
 {
-        struct vm_area_struct *vma;
         struct mm_struct *mm = current->mm;
         unsigned long addr = addr0;
+        struct vm_unmapped_area_info info;
 
         /* This should only ever run for 32-bit processes.  */
         BUG_ON(!test_thread_flag(TIF_32BIT));
 
-        /* check if free_area_cache is useful for us */
-        if (len <= mm->cached_hole_size) {
-                mm->cached_hole_size = 0;
-                mm->free_area_cache = mm->mmap_base;
-        }
-
-        /* either no address requested or can't fit in requested address hole */
-        addr = mm->free_area_cache & HPAGE_MASK;
-
-        /* make sure it can fit in the remaining address space */
-        if (likely(addr > len)) {
-                vma = find_vma(mm, addr-len);
-                if (!vma || addr <= vma->vm_start) {
-                        /* remember the address as a hint for next time */
-                        return (mm->free_area_cache = addr-len);
-                }
-        }
-
-        if (unlikely(mm->mmap_base < len))
-                goto bottomup;
-
-        addr = (mm->mmap_base-len) & HPAGE_MASK;
-
-        do {
-                /*
-                 * Lookup failure means no vma is above this address,
-                 * else if new region fits below vma->vm_start,
-                 * return with success:
-                 */
-                vma = find_vma(mm, addr);
-                if (likely(!vma || addr+len <= vma->vm_start)) {
-                        /* remember the address as a hint for next time */
-                        return (mm->free_area_cache = addr);
-                }
-
-                /* remember the largest hole we saw so far */
-                if (addr + mm->cached_hole_size < vma->vm_start)
-                        mm->cached_hole_size = vma->vm_start - addr;
-
-                /* try just below the current vma->vm_start */
-                addr = (vma->vm_start-len) & HPAGE_MASK;
-        } while (likely(len < vma->vm_start));
+        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+        info.length = len;
+        info.low_limit = PAGE_SIZE;
+        info.high_limit = mm->mmap_base;
+        info.align_mask = PAGE_MASK & ~HPAGE_MASK;
+        info.align_offset = 0;
+        addr = vm_unmapped_area(&info);
 
-bottomup:
         /*
          * A failed mmap() very likely causes application failure,
          * so fall back to the bottom-up function here. This scenario
          * can happen with large stack limits and large mmap()
          * allocations.
          */
-        mm->cached_hole_size = ~0UL;
-        mm->free_area_cache = TASK_UNMAPPED_BASE;
-        addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
-        /*
-         * Restore the topdown base:
-         */
-        mm->free_area_cache = mm->mmap_base;
-        mm->cached_hole_size = ~0UL;
+        if (addr & ~PAGE_MASK) {
+                VM_BUG_ON(addr != -ENOMEM);
+                info.flags = 0;
+                info.low_limit = TASK_UNMAPPED_BASE;
+                info.high_limit = STACK_TOP32;
+                addr = vm_unmapped_area(&info);
+        }
 
         return addr;
 }