mm: use vm_unmapped_area() on alpha architecture

Update the alpha arch_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index dbc1760..b9e37ad 100644 (file)
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1300,17 +1300,15 @@ static unsigned long
 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
                         unsigned long limit)
 {
-       struct vm_area_struct *vma = find_vma(current->mm, addr);
-
-       while (1) {
-               /* At this point:  (!vma || addr < vma->vm_end). */
-               if (limit - len < addr)
-                       return -ENOMEM;
-               if (!vma || addr + len <= vma->vm_start)
-                       return addr;
-               addr = vma->vm_end;
-               vma = vma->vm_next;
-       }
+       struct vm_unmapped_area_info info;
+
+       info.flags = 0;
+       info.length = len;
+       info.low_limit = addr;
+       info.high_limit = limit;
+       info.align_mask = 0;
+       info.align_offset = 0;
+       return vm_unmapped_area(&info);
 }
 
 unsigned long