3.0.0-rc5-mmotm0630 - rcu_update whinge in cpu_idle

[Valdis . Kletnieks]

(Sorry if this is already reported, I'm back from 10 days off and am about 8,423 mails
behind on lkml ;)

Seen at boot of 3.0.0-rc5-mmotm0630:

[    0.411716] HPET: 4 timers in total, 0 timers will be used for per-cpu timer
[    0.411716] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0
[    0.411716] hpet0: 4 comparators, 64-bit 14.318180 MHz counter
[    0.417076] Switching to clocksource hpet
[    0.417601] Warning: could not register annotated branches stats
[    0.417925] Switched to NOHz mode on CPU #1
[    0.417966] ------------[ cut here ]------------
[    0.417973] WARNING: at include/linux/rcupdate.h:256 rcu_lock_acquire+0x6a/0xc5()
[    0.417976] Hardware name: Latitude E6500                  
[    0.417978] Modules linked in:
[    0.417983] Pid: 0, comm: kworker/0:0 Not tainted 3.0.0-rc5-mmotm0630 #1
[    0.417985] Call Trace:
[    0.417991]  [<ffffffff810383f6>] warn_slowpath_common+0x7e/0x96
[    0.417995]  [<ffffffff81038423>] warn_slowpath_null+0x15/0x17
[    0.417999]  [<ffffffff8105c062>] rcu_lock_acquire+0x6a/0xc5
[    0.418005]  [<ffffffff8158e6c4>] __atomic_notifier_call_chain+0x2c/0x62
[    0.418009]  [<ffffffff8158e709>] atomic_notifier_call_chain+0xf/0x11
[    0.418014]  [<ffffffff81000771>] enter_idle+0x20/0x22
[    0.418018]  [<ffffffff81000821>] cpu_idle+0x73/0xf9
[    0.418024]  [<ffffffff81b6b7ca>] start_secondary+0x9a/0x9c
[    0.418068] ---[ end trace 4eaa2a86a8e2da22 ]---
[    0.418070] ------------[ cut here ]------------
[    0.418074] WARNING: at include/linux/rcupdate.h:262 rcu_lock_release+0x66/0xb1()
[    0.418077] Hardware name: Latitude E6500                  
[    0.418079] Modules linked in:
[    0.418083] Pid: 0, comm: kworker/0:0 Tainted: G        W   3.0.0-rc5-mmotm0630 #1
[    0.418085] Call Trace:
[    0.418089]  [<ffffffff810383f6>] warn_slowpath_common+0x7e/0x96
[    0.418093]  [<ffffffff81038423>] warn_slowpath_null+0x15/0x17
[    0.418097]  [<ffffffff8105c123>] rcu_lock_release+0x66/0xb1
[    0.418102]  [<ffffffff8158e6eb>] __atomic_notifier_call_chain+0x53/0x62
[    0.418106]  [<ffffffff8158e709>] atomic_notifier_call_chain+0xf/0x11
[    0.418110]  [<ffffffff81000771>] enter_idle+0x20/0x22
[    0.418114]  [<ffffffff81000821>] cpu_idle+0x73/0xf9
[    0.418119]  [<ffffffff81b6b7ca>] start_secondary+0x9a/0x9c
[    0.418122] ---[ end trace 4eaa2a86a8e2da23 ]---
[    0.424803] Switched to NOHz mode on CPU #0

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