commit 0ae26f1b3159f3acb21ae1e866c3c7e16edd450f
author Andrew Morton <akpm@osdl.org> Fri Jun 23 02:05:15 2006 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> Fri Jun 23 07:43:03 2006 -0700
tree 28a86cc8682ad5b247f597773572e410b9457d72
parent 32797f976d62af709943aae38a9457b5a6dbcd8a

[PATCH] mmput() might sleep

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index ac8100e..195958a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -368,6 +368,8 @@
  */
 void mmput(struct mm_struct *mm)
 {
+	might_sleep();
+
 	if (atomic_dec_and_test(&mm->mm_users)) {
 		exit_aio(mm);
 		exit_mmap(mm);