From: Gordon Jin <gordon.jin@intel.com>

This patch fixes 2 return values in mmap() to conform POSIX spec:

[EINVAL]
        The value of len is zero.
        
[ENOMEM]
        MAP_FIXED was specified, and the range [addr,addr+len) exceeds
        that allowed for the address space of a process; or, if
        MAP_FIXED was not specified and there is insufficient room in
        the address space to effect the mapping.


Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 25-akpm/mm/mmap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -puN mm/mmap.c~fix-mmap-return-value-to-conform-posix mm/mmap.c
--- 25/mm/mmap.c~fix-mmap-return-value-to-conform-posix	2005-03-14 19:12:49.000000000 -0800
+++ 25-akpm/mm/mmap.c	2005-03-14 19:12:49.000000000 -0800
@@ -896,12 +896,12 @@ unsigned long do_mmap_pgoff(struct file 
 			prot |= PROT_EXEC;
 
 	if (!len)
-		return addr;
+		return -EINVAL;
 
 	/* Careful about overflows.. */
 	len = PAGE_ALIGN(len);
 	if (!len || len > TASK_SIZE)
-		return -EINVAL;
+		return -ENOMEM;
 
 	/* offset overflow? */
 	if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
_