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authorHarald Welte <HaraldWelte@viatech.com>2009-06-08 18:29:36 +0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-10 15:22:44 -0700
commit0fea615e526b4b7eff0363ee02d5753e5f924089 (patch)
tree306e87e03c0529eec05b6a481241057edf18b0ff /arch/x86/kernel/cpu/cpufreq/Kconfig
parentCPUFREQ: Enable acpi-cpufreq driver for VIA/Centaur CPUs (diff)
downloadlinux-dev-0fea615e526b4b7eff0363ee02d5753e5f924089.tar.xz
linux-dev-0fea615e526b4b7eff0363ee02d5753e5f924089.zip
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>
Diffstat (limited to '')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/Kconfig9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/Kconfig b/arch/x86/kernel/cpu/cpufreq/Kconfig
index 52c839875478..f138c6c389b9 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.