From: Greg Ungerer <gerg@snapgear.com>

Be consistent with VM mmap, implement expand_stack().  We can't actually do
anything other than return an error in the no MMU case though.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/nommu.c |    5 +++++
 1 files changed, 5 insertions(+)

diff -puN mm/nommu.c~nommu-stub-expand_stack-for-nommu-case mm/nommu.c
--- a/mm/nommu.c~nommu-stub-expand_stack-for-nommu-case
+++ a/mm/nommu.c
@@ -367,6 +367,11 @@ struct vm_area_struct *find_extend_vma(s
 	return find_vma(mm, addr);
 }
 
+int expand_stack(struct vm_area_struct *vma, unsigned long address)
+{
+	return -ENOMEM;
+}
+
 /*
  * look up the first VMA exactly that exactly matches addr
  * - should be called with mm->mmap_sem at least held readlocked
_