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SubjectRe: irqdomain patch prevents booting qemu
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Hi Jiri,

On 03/02/17 11:49, Jiri Slaby wrote:
> Hi,
>
> with this -next commit:
>
> commit 08d85f3ea99f1eeafc4e8507936190e86a16ee8c
> Author: Marc Zyngier <marc.zyngier@arm.com>
> Date: Tue Jan 17 16:00:48 2017 +0000
>
> irqdomain: Avoid activating interrupts more than once
>
>
>
> I can no longer boot qemu machine. It stops booting at:
> [ 0.477566] x2apic enabled
> [ 0.478154] Switched APIC routing to physical x2apic.
> [ 0.479405] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
>
>
> It loops in:
> #0 calibrate_APIC_clock () at arch/x86/kernel/apic/apic.c:757
> #1 setup_boot_APIC_clock () at arch/x86/kernel/apic/apic.c:880
> #2 0xffffffff81f7bef2 in apic_bsp_setup (upmode=<optimized out>)
> at arch/x86/kernel/apic/apic.c:2300
> #3 0xffffffff81f79c84 in native_smp_prepare_cpus (max_cpus=<optimized out>)
> at arch/x86/kernel/smpboot.c:1339
> #4 0xffffffff81f6801d in smp_prepare_cpus (max_cpus=<optimized out>)
> at ./arch/x86/include/asm/smp.h:85
> #5 kernel_init_freeable () at init/main.c:1020
> #6 0xffffffff8192372e in kernel_init (unused=<optimized out>)
> at init/main.c:956
> #7 0xffffffff8192ac5c in ret_from_fork () at arch/x86/entry/entry_64.S:430
>
>
> which is:
> 757 while (lapic_cal_loops <= LAPIC_CAL_LOOPS)
> 758 cpu_relax();
>
>
> lapic_cal_loops is not incrementing, so it seems that interrupts are not
> coming.
>
> Reverting the commit makes the machine boot again.

I think Thomas fixed this in
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1322872.html

which is currently in tip/irq/urgent

Thanks,

M.
--
Jazz is not dead. It just smells funny...

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