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[PATCH] i386: Handle missing local APIC timer interrupts on C3 state

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Whenever we see that a CPU is capable of C3 (during ACPI cstate init), we
disable local APIC timer and switch to using a broadcast from external timer
interrupt (IRQ 0). This is needed because Intel CPUs stop the local
APIC timer in C3.  This is currently only enabled for Intel CPUs.

Patch below adds the code for i386 and also the ACPI hunk.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Venkatesh Pallipadi
2006-01-11 22:44:21 +01:00
committed by Linus Torvalds
parent 5a07a30c3c
commit 6eb0a0fd05
4 changed files with 102 additions and 2 deletions
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6
arch/i386/kernel/time.c
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@@ -302,6 +302,12 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
do_timer_interrupt(irq, regs);
write_sequnlock(&xtime_lock);
#ifdef CONFIG_X86_LOCAL_APIC
if (using_apic_timer)
smp_send_timer_broadcast_ipi(regs);
#endif
return IRQ_HANDLED;
}