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| author | Ingo Molnar <mingo@elte.hu> | 2009-03-28 22:27:45 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-28 22:27:45 +0100 |
| commit | 3fab191002b184e4390aa07c7149c6cc7b638ec7 (patch) | |
| tree | 821382d49e47c19531bfc3bb9e1f8922486374d4 /arch/x86/kernel/cpu/intel.c | |
| parent | Merge branches 'x86/apic', 'x86/cleanups' and 'x86/mm' into x86/core (diff) | |
| parent | Merge branch 'percpu-cpumask-x86-for-linus-2' of git://git.kernel.org/pub/scm... (diff) | |
| download | linux-3fab191002b184e4390aa07c7149c6cc7b638ec7.tar.gz linux-3fab191002b184e4390aa07c7149c6cc7b638ec7.zip | |
Merge branch 'linus' into x86/core
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 8 |
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; } /* |