[PATCH] x86_64: Add pmtimer support

[pandora-kernel.git] / arch / x86_64 / Kconfig

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 44ee7f6..82cb2a3 100644 (file)
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -303,6 +303,20 @@ 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"
+       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