tree 608880dd1c9d1751eceea9f21f7f1d2898ea917f
parent a04b61d3dc68857dcc81a5761268c96056742fb2
author Heiko Carstens <heiko.carstens@de.ibm.com> 1154253832 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1154377721 -0700

[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>