Messages in this thread | | | Date | Tue, 2 Jun 2015 09:38:04 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH] ARM: socfpga: add smp_ops.cpu_kill to make kexec/kdump available |
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On Tue, Jun 02, 2015 at 02:32:19PM +0900, hiraku.toyooka.gu@hitachi.com wrote: > Before kexec soft reboot, secondary CPU's IRQs except for per-cpu twd are > migrated from a CPU going offline to CPU0 by migrate_irqs(). The twd is > stopped by twd_timer_cpu_notify(). As a result, secondary CPU has no > interrupt source before entering WFI loop.
I wasn't thinking of SPIs and PPIs, but SGIs - the IPI interrupts coming from the boot CPU.
> After staring kexec'd kernel, all interrupts are sent to CPU0 by default > and CPU0 resets the secondary CPUs in socfpga_boot_secondary(). > I think it's the reason why kexec in socfpga succeeds.
If you have a way to reset CPU0, why are you not using this for hotplug when a CPU is hot-unplugged?
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