1 files changed, 24 insertions, 115 deletions

diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index afeb710ec5c3..6777177807c2 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -30,25 +30,13 @@ 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 & ~shm_align_mask;
-        unsigned long off = (pgoff << PAGE_SHIFT) & shm_align_mask;
-
-        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 start_addr;
         int do_colour_align;
+        struct vm_unmapped_area_info info;
 
         if (flags & MAP_FIXED) {
                 /* We do not accept a shared mapping if it would violate
@@ -79,47 +67,13 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
                         return addr;
         }
 
-        if (len > mm->cached_hole_size) {
-                start_addr = addr = mm->free_area_cache;
-        } else {
-                mm->cached_hole_size = 0;
-                start_addr = addr = TASK_UNMAPPED_BASE;
-        }
-
-full_search:
-        if (do_colour_align)
-                addr = COLOUR_ALIGN(addr, pgoff);
-        else
-                addr = PAGE_ALIGN(mm->free_area_cache);
-
-        for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-                /* At this point:  (!vma || addr < vma->vm_end). */
-                if (unlikely(TASK_SIZE - len < addr)) {
-                        /*
-                         * Start a new search - just in case we missed
-                         * some holes.
-                         */
-                        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_colour_align)
-                        addr = COLOUR_ALIGN(addr, pgoff);
-        }
+        info.flags = 0;
+        info.length = len;
+        info.low_limit = TASK_UNMAPPED_BASE;
+        info.high_limit = TASK_SIZE;
+        info.align_mask = do_colour_align ? (PAGE_MASK & shm_align_mask) : 0;
+        info.align_offset = pgoff << PAGE_SHIFT;
+        return vm_unmapped_area(&info);
 }
 
 unsigned long
@@ -131,6 +85,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         struct mm_struct *mm = current->mm;
         unsigned long addr = addr0;
         int do_colour_align;
+        struct vm_unmapped_area_info info;
 
         if (flags & MAP_FIXED) {
                 /* We do not accept a shared mapping if it would violate
@@ -162,73 +117,27 @@ 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_colour_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_colour_align ? (PAGE_MASK & shm_align_mask) : 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_colour_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_colour_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 = TASK_SIZE;
+                addr = vm_unmapped_area(&info);
+        }
 
         return addr;
 }
@@ -238,7 +147,7 @@ bottomup:
  * You really shouldn't be using read() or write() on /dev/mem.  This
  * might go away in the future.
  */
-int valid_phys_addr_range(unsigned long addr, size_t count)
+int valid_phys_addr_range(phys_addr_t addr, size_t count)
 {
         if (addr < __MEMORY_START)
                 return 0;