Description of problem:
While booting the system a lockdep related oops is shown.

Version-Release number of selected component (if applicable):
kernel-2.6.17-1.2358.fc6

How reproducible:
allways

Steps to Reproduce:
1. Boot system
2.
3.
  
Actual results:
=================================
[ INFO: inconsistent lock state ]
---------------------------------
inconsistent {hardirq-on-W} -> {in-hardirq-W} usage.
hwclock/486 [HC1[1]:SC0[0]:HE0:SE1] takes:
 (rtc_lock){+-..}, at: [<c053c9ad>] rtc_get_rtc_time+0x1c/0x177
{hardirq-on-W} state was registered at:
  [<c043c546>] lock_acquire+0x4b/0x6d
  [<c060e29b>] _spin_lock+0x19/0x28
  [<c0407433>] get_cmos_time+0x13/0x11d
  [<c07ad610>] hpet_time_init+0x8/0x4e
  [<c07a769b>] start_kernel+0x22c/0x3a9
  [<c0400210>] 0xc0400210
irq event stamp: 1792
hardirqs last  enabled at (1791): [<c0403f77>] restore_nocheck+0x12/0x15
hardirqs last disabled at (1792): [<c04049c7>] common_interrupt+0x1b/0x2c
softirqs last  enabled at (716): [<c042987d>] __do_softirq+0xec/0xf2
softirqs last disabled at (707): [<c04065ab>] do_softirq+0x5a/0xbe

other info that might help us debug this:
no locks held by hwclock/486.

stack backtrace:
 [<c0405167>] show_trace_log_lvl+0x54/0xfd
 [<c040571e>] show_trace+0xd/0x10
 [<c040583d>] dump_stack+0x19/0x1b
 [<c043a982>] print_usage_bug+0x1ca/0x1d7
 [<c043acc8>] mark_lock+0x96/0x36a
 [<c043b9fa>] __lock_acquire+0x3b2/0x98d
 [<c043c546>] lock_acquire+0x4b/0x6d
 [<c060e4a4>] _spin_lock_irq+0x1f/0x2e
 [<c053c9ad>] rtc_get_rtc_time+0x1c/0x177
 [<c0419824>] hpet_rtc_interrupt+0x92/0x14d
 [<c0451020>] handle_IRQ_event+0x20/0x4d
 [<c04510e1>] __do_IRQ+0x94/0xef
 [<c04066c8>] do_IRQ+0xb9/0xcd
 [<c04049d1>] common_interrupt+0x25/0x2c


Expected results:
no oops ;)

Additional info:
This is on a MacBook running current FC6 devel.