On Tue, Jun 02, 2015 at 02:32:19PM +0900, [email protected] 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? -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
