Messages in this thread Patch in this message | | | Subject | Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4}) | From | Thomas Gleixner <> | Date | Tue, 20 Mar 2007 02:15:29 +0100 |
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On Mon, 2007-03-19 at 22:51 +0100, Stefan Prechtel wrote: > 2007/3/19, Thomas Gleixner <tglx@linutronix.de>: > > On Mon, 2007-03-19 at 21:35 +0100, Stefan Prechtel wrote: > > > CPU0 CPU1 > > > 0: 28289 0 local-APIC-edge-fasteio timer > > > ... > > > LOC: 28237 28236 > > > > > > after a read: (I hope that is this what you want :-) > > > CPU0 CPU1 > > > 0: 30344 0 local-APIC-edge-fasteio timer > > > ... > > > LOC: 30292 30291 > > > > Is this with AC plugged in ? If yes, please provide the same numbers for > > battery mode. > > Yes. And here is the output for battery mode (2.6.20): > CPU0 CPU1 > 0: 292153 0 local-APIC-edge-fasteio timer > LOC: 292114 292113 > > CPU0 CPU1 > 0: 293263 0 local-APIC-edge-fasteio timer > LOC: 293224 293223
Hmm. Can you please apply the following patch on top of 2.6.20 and check, if the WARN_ON_ONCE triggers when you boot w/o AC plugged ?
Thanks,
tglx
Index: linux-2.6.20/arch/i386/kernel/apic.c =================================================================== --- linux-2.6.20.orig/arch/i386/kernel/apic.c +++ linux-2.6.20/arch/i386/kernel/apic.c @@ -1174,6 +1174,8 @@ void switch_APIC_timer_to_ipi(void *cpum cpumask_t mask = *(cpumask_t *)cpumask; int cpu = smp_processor_id(); + WARN_ON_ONCE(1); + if (cpu_isset(cpu, mask) && !cpu_isset(cpu, timer_bcast_ipi)) { disable_APIC_timer();
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