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-rw-r--r--arch/x86_64/Kconfig17
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 44ee7f6acf7..289f448ac89 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -303,6 +303,21 @@ config HPET_TIMER
as it is off-chip. You can find the HPET spec at
<http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
+config X86_PM_TIMER
+ bool "PM timer"
+ depends on ACPI
+ default y
+ help
+ Support the ACPI PM timer for time keeping. This is slow,
+ but is useful on some chipsets without HPET on systems with more
+ than one CPU. On a single processor or single socket multi core
+ system it is normally not required.
+ When the PM timer is active 64bit vsyscalls are disabled
+ and should not be enabled (/proc/sys/kernel/vsyscall64 should
+ not be changed).
+ The kernel selects the PM timer only as a last resort, so it is
+ useful to enable just in case.
+
config HPET_EMULATE_RTC
bool "Provide RTC interrupt"
depends on HPET_TIMER && RTC=y
@@ -407,7 +422,7 @@ config PCI_DIRECT
config PCI_MMCONFIG
bool "Support mmconfig PCI config space access"
- depends on PCI
+ depends on PCI && ACPI
select ACPI_BOOT
config UNORDERED_IO