CPUFREQ: Mark e_powersaver driver as EXPERIMENTAL and DANGEROUS

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.

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/cpu/cpufreq/Kconfig b/arch/x86/kernel/cpu/cpufreq/Kconfig
index 52c839875478571711df3d861ffc1a3d4c5eb413..f138c6c389b921628575575f6a2b0c115441f6c0 100644 (file)
--- 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.