From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Sun, 30 Jul 2006 10:03:52 +0000 (-0700)
Subject: [PATCH] pi-futex: missing pi_waiters plist initialization
X-Git-Tag: v2.6.18-rc4~107
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b50f60ceeef2e38e529737c0260d9543939915ad;p=pandora-kernel.git

[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>
---

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