[PATCH 2.6] fix mmap() return value to conform to POSIX

[Hong Liu]

POSIX said:
mmap() should return [EOVERFLOW] if the file is a regular file and the
value of off + len exceeds the offset maximum established in the open
file description associated with fildes.

--- a/mm/mmap.c.orig 2005-03-16 14:08:59.116052416 +0800
+++ b/mm/mmap.c      2005-03-16 14:10:16.167338840 +0800
@@ -906,7 +906,7 @@ unsigned long do_mmap_pgoff(struct file
        
	/* offset overflow? */
        if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
-               return -EINVAL;
+               return -EOVERFLOW;

        /* Too many mappings? */
        if (mm->map_count > sysctl_max_map_count)


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