linux-kernel - irqdomain patch prevents booting qemu

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Date:   Fri, 3 Feb 2017 12:49:01 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     marc.zyngier@....com, Thomas Gleixner <tglx@...utronix.de>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:     andre.przywara@....com
Subject: irqdomain patch prevents booting qemu

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.

thanks,
-- 
js
suse labs