switch do_brk() to get_unmapped_area()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 8 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index c04146da8efd..ed70a68e882a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1985,20 +1985,14 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
         if (!len)
                 return addr;
 
-        if ((addr + len) > TASK_SIZE || (addr + len) < addr)
-                return -EINVAL;
-
-        if (is_hugepage_only_range(mm, addr, len))
-                return -EINVAL;
-
         error = security_file_mmap(NULL, 0, 0, 0, addr, 1);
         if (error)
                 return error;
 
         flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
 
-        error = arch_mmap_check(addr, len, flags);
-        if (error)
+        error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
+        if (error & ~PAGE_MASK)
                 return error;
 
         /*