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authorIngo Molnar <mingo@elte.hu>2009-02-26 21:21:59 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-27 08:35:19 +0100
commit1b49061d400c9e51e3ac2aac026a099fe599b9bb (patch)
tree54c632cd7f0be2573897c1463a247e69fb769940 /arch/x86
parent14131f2f98ac350ee9e73faed916d2238a8b6a0d (diff)
parent83ce400928680a6c8123d492684b27857f5a2d95 (diff)
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Merge branch 'sched/clock' into tracing/ftrace
Conflicts: kernel/sched_clock.c
Diffstat (limited to 'arch/x86')
-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 24ff26a38ade..5fff00c70de0 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>
@@ -56,11 +57,16 @@ 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;
}
}