Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

[Ard -kwaak- van Breemen <ard@telegraafnet.nl>]

On Thu, Dec 21, 2006 at 04:04:04PM +0800, Zhang, Yanmin wrote:
> I couldn't reproduce it on my EM64T machine. I instrumented function start_kernel and
> didn't find irq was enabled before calling init_IRQ. It'll be better if the reporter could
> instrument function start_kernel to capture which function enables irq.

Editing init/main.c:
        preempt_disable();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT17");
        build_all_zonelists();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT18");
        page_alloc_init();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT19");
        printk(KERN_NOTICE "Kernel command line: %s\n", saved_command_line);
        parse_early_param();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT20");
        parse_args("Booting kernel", command_line, __start___param,
                   __stop___param - __start___param,
                   &unknown_bootoption);
                printk("BLAAT21");
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
        sort_main_extable();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT22");
        trap_init();
        if (!irqs_disabled())
                printk("start_kernel(): bug: interrupts were enabled early\n");
                printk("BLAAT23");

Results in:
^MAllocating PCI resources starting at 88000000 (gap: 80000000:60000000)
^MBLAAT12BLAAT13<6>PERCPU: Allocating 32960 bytes of per cpu data
^MBLAAT14BLAAT15BLAAT16BLAAT17Built 2 zonelists.  Total pages: 1032635
^MBLAAT18BLAAT19<5>Kernel command line: console=tty0 console=ttyS0,115200 hdb=noprobe hdc=noprobe hdd=noprobe root=/dev/md0 ro panic=30 earlyprintk=serial,ttyS0,115200 
^MBLAAT20<6>ide_setup: hdb=noprobe
^Mide_setup: hdc=noprobe
^Mide_setup: hdd=noprobe
^MBLAAT21start_kernel(): bug: interrupts were enabled early
^Mstart_kernel(): bug: interrupts were enabled early
^MBLAAT22Initializing CPU#0

Hmmm, that actually doesn't make sense to me (unless parse_args is able to enable irq's).
-- 
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