From: Andrew Morton <akpm@osdl.org>

exit_aio() and exit_mmap() can sleep.  But it's easy to accidentally call
mmput() from inside locks.

Cc: Dave Peterson <dsp@llnl.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/fork.c |    2 ++
 1 files changed, 2 insertions(+)

diff -puN kernel/fork.c~mmput-might-sleep kernel/fork.c
--- devel/kernel/fork.c~mmput-might-sleep	2006-04-22 01:39:37.000000000 -0700
+++ devel-akpm/kernel/fork.c	2006-04-22 01:39:37.000000000 -0700
@@ -368,6 +368,8 @@ void fastcall __mmdrop(struct mm_struct 
  */
 void mmput(struct mm_struct *mm)
 {
+	might_sleep();
+
 	if (atomic_dec_and_test(&mm->mm_users)) {
 		exit_aio(mm);
 		exit_mmap(mm);
_