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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-07-30 03:03:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-31 13:28:41 -0700
commitb50f60ceeef2e38e529737c0260d9543939915ad (patch)
tree608880dd1c9d1751eceea9f21f7f1d2898ea917f /kernel
parenta04b61d3dc68857dcc81a5761268c96056742fb2 (diff)
downloadlwn-b50f60ceeef2e38e529737c0260d9543939915ad.tar.gz
lwn-b50f60ceeef2e38e529737c0260d9543939915ad.zip
[PATCH] pi-futex: missing pi_waiters plist initialization
Initialize init task's pi_waiters plist. Otherwise cpu hotplug of cpu 0 might crash, since rt_mutex_getprio() accesses an uninitialized list head. call chain which led to crash: take_cpu_down sched_idle_next __setscheduler rt_mutex_getprio Using PLIST_HEAD_INIT in the INIT_TASK macro doesn't work unfortunately, since the pi_waiters member is only conditionally present. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index de440b220b4c..a2be2d055299 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6766,6 +6766,11 @@ void __init sched_init(void)
}
set_load_weight(&init_task);
+
+#ifdef CONFIG_RT_MUTEXES
+ plist_head_init(&init_task.pi_waiters, &init_task.pi_lock);
+#endif
+
/*
* The boot idle thread does lazy MMU switching as well:
*/