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).
--
program signature;
begin { telegraaf.com
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end
.
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