manfred at colorfullife
Sep 7, 2008, 2:13 AM
Post #1 of 1
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ia64 start secondary cpus: what's the first line where interrupts can arrive?
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Hi,
For my rcu implementation, I try to figure out how the boot process for
secondary cpus works.
arch/ia64/kernel/smpboot.c contains the following code:
> static void __cpuinit
> smp_callin (void)
> {
> [snip]
> per_cpu(cpu_state, cpuid) = CPU_ONLINE;
> spin_unlock(&vector_lock);
> ipi_call_unlock_irq();
> <<<<<
> <<<<< ipi_call_unlock_irq() does local_irq_enable()
> <<<<<
> smp_setup_percpu_timer();
>
> ia64_mca_cmc_vector_setup(); /* Setup vector on AP */
>
> #ifdef CONFIG_PERFMON
> pfm_init_percpu();
> #endif
>
> local_irq_enable();
> <<<<<
> <<<<< Another local_irq_enable().
> <<<<<
Which of these two local_irq_enable()'s is the right one?
And: IMHO it's unclean to abuse ipi_call_unlock_irq() to enable the
local interrupts.
What about the attached patch? Untested due to lack of test hardware.
--
Manfred
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patch-ia64-smpboot
