rtc : lockdep warning

[Dave Young]

------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on+0xe3/0x130()
Modules linked in: btusb intel_agp bluetooth snd_hda_intel evdev
agpgart thermal sg processor rtc_cmos button serio_raw i2c_i801
snd_pcm rtc_core pcspkr 3c59x rtc_lib snd_timer snd soundcore
snd_page_alloc
Pid: 2307, comm: hwclock Not tainted 2.6.24 #25
 [<c012b100>] ? zap_locks+0x40/0x70
 [<c012a894>] warn_on_slowpath+0x54/0x80
 [<c014d3b9>] ? mark_lock_irq+0x79/0x3b0
 [<c014cb72>] ? validate_chain+0x1d2/0x320
 [<c014dcc3>] ? mark_lock+0x93/0x1d0
 [<c010aaa5>] ? native_sched_clock+0x85/0xe0
 [<c014b42d>] ? put_lock_stats+0xd/0x30
 [<c014b4b0>] ? lock_release_holdtime+0x60/0x80
 [<c011a58f>] ? hpet_rtc_interrupt+0xcf/0x230
 [<c014ed87>] ? __lock_release+0x47/0x70
 [<c011a58f>] ? hpet_rtc_interrupt+0xcf/0x230
 [<c0424962>] ? _spin_unlock_irq+0x22/0x50
 [<c014d873>] trace_hardirqs_on+0xe3/0x130
 [<c0424962>] _spin_unlock_irq+0x22/0x50
 [<c011a58f>] hpet_rtc_interrupt+0xcf/0x230
 [<c015dfdf>] ? handle_edge_irq+0xaf/0x150
 [<c015cc38>] handle_IRQ_event+0x28/0x60
 [<c015dfe8>] handle_edge_irq+0xb8/0x150
 [<c0107afc>] do_IRQ+0x3c/0x80
 [<c014d849>] ? trace_hardirqs_on+0xb9/0x130
 [<c0105b2a>] common_interrupt+0x2e/0x34
 =======================
---[ end trace fb50847cfa3f5ac9 ]---
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