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Date: Tue, 17 Apr 2007 19:01:26 +0200
From: John Sigler <linux.kernel@free.fr>
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CC: linux-kernel@vger.kernel.org
Subject: Re: Disabling x86 System Management Mode
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John Sigler wrote:

> static int hello_init(void)
> {
>   int i;
>   int *lat;
>   printk(KERN_ALERT "INIT\n");
>   lat = kmalloc(MAX * sizeof *lat, GFP_KERNEL);
>   if (lat == NULL) return -1;
>   for (i=0; i < MAX; ++i) lat[i] = 0;
>   for (i=0; i < 5; ++i) foo();
>   for (i=0; i < N; ++i)
>   {
>     unsigned count, res;
>     set_current_state(TASK_INTERRUPTIBLE);
>     schedule_timeout(1);
>     foo();
>     local_irq_disable();
>     count = foo();
>     local_irq_enable();
>     res = count >> 8;
>     if (res < MAX) ++lat[res]; else printk(KERN_ALERT "OUT OF RANGE\n");
>   }
> 
>   for (i=0; i < MAX; ++i)
>     if (lat[i] != 0) printk(KERN_ALERT "%d %d\n", i<<8, lat[i]);

kfree(lat);

>   return 0;
> }