[PATCH 6/10 -tip] x86: early_init_intel() user of Advanced Power Management features

Jaswinder Singh Rajput
2009-05-12T15:48:53Z

use X86_FEATURE_CONSTANT_TSC to determine TSC Invariance

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
arch/x86/kernel/cpu/intel.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 7437fa1..62130a0 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -61,14 +61,14 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
c->x86_phys_bits = 36;

/*
- * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
- * with P/T states and does not stop in deep C-states.
+ * Advanced power management is 8000_0007 edx.
+ * Bit 8 is TSC runs at constant rate with P/T states
+ * and does not stop in deep C-states.
*
* It is also reliable across cores and sockets. (but not across
* cabinets - we turn it off in that case explicitly.)
*/
- if (c->x86_power & (1 << 8)) {
- set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+ if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
sched_clock_stable = 1;
--
1.6.0.6