explanation of apm_do_idle()

explanation of apm_do_idle()

[Michael Buesch]

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Hi,

What's the purpose of
	t = jiffies;
in apm_do_idle()?
Looks very strange and incorrect to me,
but I think there's a reason for it.
Sorry for stealing your time, but I really don't get behind it.
Thank you!


static int apm_do_idle(void)
{
	u32	eax;

	if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
		static unsigned long t;

		/* This always fails on some SMP boards running UP kernels.
		 * Only report the failure the first 5 times.
		 */
		if (++t < 5)
		{
			printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
					(eax >> 8) & 0xff);
			t = jiffies;
		}
		return -1;
	}
	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
	return clock_slowed;
}

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]


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Re: explanation of apm_do_idle()

[Michael Buesch]

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Hash: SHA1

Huh? Nobody out there who could explain it, please?
I'm surprised. 8-}

Quoting Michael Buesch <mbuesch@freenet.de>:
> Hi,
> 
> What's the purpose of
> 	t = jiffies;
> in apm_do_idle()?
> Looks very strange and incorrect to me,
> but I think there's a reason for it.
> Sorry for stealing your time, but I really don't get behind it.
> Thank you!
> 
> 
> static int apm_do_idle(void)
> {
> 	u32	eax;
> 
> 	if (apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax)) {
> 		static unsigned long t;
> 
> 		/* This always fails on some SMP boards running UP kernels.
> 		 * Only report the failure the first 5 times.
> 		 */
> 		if (++t < 5)
> 		{
> 			printk(KERN_DEBUG "apm_do_idle failed (%d)\n",
> 					(eax >> 8) & 0xff);
> 			t = jiffies;
> 		}
> 		return -1;
> 	}
> 	clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
> 	return clock_slowed;
> }
> 

- -- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]


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