[Xen-devel] Xen randomly stuck in mdelay() during MP initialization

[Julian Pidancet <julian.pidancet@xxxxxxxxx>]

Hi,

When trying to boot xen 4.1 on new hardware, Xen become stuck in
wakeup_secondary_cpu() in the mdelay function.

    Dprintk("Waiting for send to finish...\n");
    timeout = 0;
    do {
        Dprintk("+");
        udelay(100);
        if ( !x2apic_enabled )
            send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
    } while ( send_status && (timeout++ < 1000) );

    printk("before mdelay\n");
    mdelay(10);
    printk("after mdelay\n");

    Dprintk("Deasserting INIT.\n");

The hang can happen randomly with any of the CPUs to wake up and
sometime doesn't happen at all.
Replacing mdelay(10) with udelay(10) seems to fix the issue.

-- 
Julian

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