[PATCH -mm 2/2] keyctl_session_to_parent: use thread_group_empty()to check singlethreadness

[Oleg Nesterov]

No functional changes.

keyctl_session_to_parent() is the only user of signal->count which needs
the correct value. Change it to use thread_group_empty() instead, this
must be strictly equivalent under tasklist, and imho looks better.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---

 security/keys/keyctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 34-rc1/security/keys/keyctl.c~MISC_2_KEYCTL	2009-12-18 19:05:38.000000000 +0100
+++ 34-rc1/security/keys/keyctl.c	2010-03-23 15:21:00.000000000 +0100
@@ -1269,7 +1269,7 @@ long keyctl_session_to_parent(void)
 		goto not_permitted;
 
 	/* the parent must be single threaded */
-	if (atomic_read(&parent->signal->count) != 1)
+	if (!thread_group_empty(parent))
 		goto not_permitted;
 
 	/* the parent and the child must have different session keyrings or

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