>>-----Original Message-----
>>From: Ard -kwaak- van Breemen [mailto:[email protected]]
>>Sent: 2006年12月22日 5:06
>>To: Zhang, Yanmin
>>Cc: Andrew Morton; Chuck Ebbert; Yinghai Lu; [email protected]; [email protected]; [email protected];
>>[email protected]; Eric W. Biederman
>>Subject: Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine
>>
>>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).
I think parse_args enables irq when it calls callbacks.
Could you try below?
1) Test Andrew's patch of sema down_write;
2) Apply below patch and see what the output is when booting. If the output has
"[BUG]..address.", Pls. map the address to function name by System.map.
--- linux-2.6.19/kernel/params.c 2006-12-08 15:32:49.000000000 +0800
+++ linux-2.6.19_work/kernel/params.c 2006-12-22 12:28:38.000000000 +0800
@@ -53,13 +53,22 @@ static int parse_one(char *param,
int (*handle_unknown)(char *param, char *val))
{
unsigned int i;
+ int result;
+ int irq_is_disabled;
/* Find parameter */
for (i = 0; i < num_params; i++) {
if (parameq(param, params[i].name)) {
DEBUGP("They are equal! Calling %p\n",
params[i].set);
- return params[i].set(val, ¶ms[i]);
+ irq_is_disabled = irqs_disabled();
+ result = params[i].set(val, ¶ms[i]);
+ if (irq_is_disabled && !irqs_disabled())
+ {
+ printk("[BUG] parse_one: function %p enabled irq!\n",
+ params[i].set);
+ }
+ return result;
}
}
--- linux-2.6.19/init/main.c 2006-12-08 15:32:49.000000000 +0800
+++ linux-2.6.19_work/init/main.c 2006-12-22 12:28:50.000000000 +0800
@@ -181,6 +181,7 @@ static int __init obsolete_checksetup(ch
{
struct obs_kernel_param *p;
int had_early_param = 0;
+ int result, irq_is_disabled;
p = __setup_start;
do {
@@ -197,8 +198,17 @@ static int __init obsolete_checksetup(ch
printk(KERN_WARNING "Parameter %s is obsolete,"
" ignored\n", p->str);
return 1;
- } else if (p->setup_func(line + n))
- return 1;
+ } else {
+ irq_is_disabled = irqs_disabled();
+ result = p->setup_func(line + n);
+ if (irq_is_disabled && !irqs_disabled())
+ {
+ printk("[BUG] obsolete_checksetup: function %p enabled irq!\n",
+ p->setup_func);
+ }
+ if (result)
+ return 1;
+ }
}
p++;
} while (p < __setup_end);
-
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