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