linux-kernel - Re: irqdomain patch prevents booting qemu

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Date:   Fri, 3 Feb 2017 11:57:01 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Jiri Slaby <jslaby@...e.cz>, Thomas Gleixner <tglx@...utronix.de>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:     andre.przywara@....com
Subject: Re: irqdomain patch prevents booting qemu

Hi Jiri,

On 03/02/17 11:49, Jiri Slaby wrote:
> Hi,
> 
> with this -next commit:
> 
> commit 08d85f3ea99f1eeafc4e8507936190e86a16ee8c
> Author: Marc Zyngier <marc.zyngier@....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...