Re: 2.6.19-rc5-mm2

[Mattia Dongili]

On Wed, Nov 15, 2006 at 10:06:23AM -0800, Pallipadi, Venkatesh wrote:
[...]
> >Venki, I'm a little worried about the switch/case in question (line
> >702): the data->cpu_feature is set either to SYSTEM_IO_CAPABLE or
> >SYSTEM_INTEL_MSR_CAPABLE just a few lines above so it seems the switch
> >variable is wrong and none of the 2 cases will ever get a chance to
> >execute.
> >
> 
> The variable is set few lines before. So, it should be OK to switch on
> that 
> variable set and one of the two cases will execute. isn't it? Or am 
> I missing something?

Yes, patch is coming.

> >Unfortunately I don't have enough knowledge to tell if it's simply
> >necessary to fix the switch variable as 
> 
> Get_cur_freq_on_cpu will not work on SYSTEM_IO space as ACPI does not
> have an interface to get the current frequency. It only has a interface
> to say whether the last transitions tried was successful or not.
> So, if indeed a change in switch is required, first option should be
> good...

Hmmmm... I see, the following path fooled me, but re-reading it seems
more obvious what it is doing :)

	get_cur_freq_on_cpu
		extract_freq
			switch (data->cpu_feature) {
			case SYSTEM_INTEL_MSR_CAPABLE:
				return extract_msr(val, data);
			case SYSTEM_IO_CAPABLE:
				return extract_io(val, data);
			...

-- 
mattia
:wq!
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/