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authorIngo Molnar <mingo@elte.hu>2009-03-28 22:27:45 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-28 22:27:45 +0100
commit3fab191002b184e4390aa07c7149c6cc7b638ec7 (patch)
tree821382d49e47c19531bfc3bb9e1f8922486374d4 /arch/x86/kernel/cpu/intel.c
parent93394a761d78503f11d05b1a7b23d5a9ccc8dad2 (diff)
parent7c730ccdc1188b97f5c8cb690906242c7ed75c22 (diff)
Merge branch 'linus' into x86/core
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
-rw-r--r--arch/x86/kernel/cpu/intel.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index b09d4eb52bb9..7437fa133c02 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -4,6 +4,7 @@
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/smp.h>
+#include <linux/sched.h>
#include <linux/thread_info.h>
#include <linux/module.h>
@@ -61,11 +62,16 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
/*
* 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
+ * 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);
set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
+ set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
+ sched_clock_stable = 1;
}
/*