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SubjectRe: [PATCH 2/2] CPUFREQ: Mark e_powersaver driver as EXPERIMENTAL and DANGEROUS
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On Mon June 8 2009, Michael S. Zick wrote:
> On Mon June 8 2009, Harald Welte wrote:
> > The e_powersaver driver for VIA's C7 CPU's needs to be marked as
> > DANGEROUS as it configures the CPU to power states that are out
> > of specification.
> >
>
> I'll put this and your acpi proposal into a test build today - -
> If my machine survives, I'll post the build for others to try.
>
> The current build posted (-09159) does not have *either* control
>
Sorry - typo - today is of course the 159th day of the year - -
The previously posted build *without* either control is the -09156. ;)

Mike
> included, leaving the machine running at silicon "#reset" conditions.
> Slow - but safe.
>
> Mike
> > According to Centaur, all systems with C7 and Nano CPU's support
> > the ACPI p-state method. Thus, the acpi-cpufreq driver should
> > be used instead.
> >
> > Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
> > ---
> > arch/x86/kernel/cpu/cpufreq/Kconfig | 9 ++++++---
> > 1 files changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/kernel/cpu/cpufreq/Kconfig b/arch/x86/kernel/cpu/cpufreq/Kconfig
> > index 52c8398..f138c6c 100644
> > --- a/arch/x86/kernel/cpu/cpufreq/Kconfig
> > +++ b/arch/x86/kernel/cpu/cpufreq/Kconfig
> > @@ -220,11 +220,14 @@ config X86_LONGHAUL
> > If in doubt, say N.
> >
> > config X86_E_POWERSAVER
> > - tristate "VIA C7 Enhanced PowerSaver"
> > + tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
> > select CPU_FREQ_TABLE
> > - depends on X86_32
> > + depends on X86_32 && EXPERIMENTAL
> > help
> > - This adds the CPUFreq driver for VIA C7 processors.
> > + This adds the CPUFreq driver for VIA C7 processors. However, this driver
> > + does not have any safeguards to prevent operating the CPU out of spec
> > + and is thus considered dangerous. Please use the regular ACPI cpufreq
> > + driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
> >
> > If in doubt, say N.
> >
>
>
> --
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