[PATCH] initialise pi_lock if CONFIG_RT_MUTEXES=N

Fixes a bogus lockdep warning which causes lockdep to disable itself.

Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/fork.c b/kernel/fork.c
index d154cc786489f3928bbaefe5d31e8da4f78b2481..6af959c034d892a360f4196ed3b981a51890f92a 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -933,8 +933,8 @@ asmlinkage long sys_set_tid_address(int __user *tidptr)
 
 static inline void rt_mutex_init_task(struct task_struct *p)
 {
-#ifdef CONFIG_RT_MUTEXES
        spin_lock_init(&p->pi_lock);
+#ifdef CONFIG_RT_MUTEXES
        plist_head_init(&p->pi_waiters, &p->pi_lock);
        p->pi_blocked_on = NULL;
 #endif