Re: [PATCH] cpufreq: Change link order of x86 cpufreq modules

From: Ingo Molnar
Date: Wed Feb 18 2009 - 13:31:59 EST



* Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:

> Change the link order of the cpufreq modules to ensure that they're
> probed in the preferred order when statically linked in.
>
> Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
>
> diff --git a/arch/x86/kernel/cpu/cpufreq/Makefile b/arch/x86/kernel/cpu/cpufreq/Makefile
> index 560f776..509296d 100644
> --- a/arch/x86/kernel/cpu/cpufreq/Makefile
> +++ b/arch/x86/kernel/cpu/cpufreq/Makefile
> @@ -1,6 +1,11 @@
> +# Link order matters. K8 is preferred to ACPI because of firmware bugs in early
> +# K8 systems. ACPI is preferred to all other hardware-specific drivers.
> +# speedstep-* is preferred over p4-clockmod.

Nice fix! Where does this information come from? Distro module
ordering magic? It's rather non-trivial.

(small style nit: the first line in the Makefile is overlong.)

Ingo
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