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    SubjectRe: [PATCH 2/2] CPUFREQ: Mark e_powersaver driver as EXPERIMENTAL and DANGEROUS
    Date
    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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