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Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/setup.c5
-rw-r--r--arch/x86_64/kernel/time.c5
2 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index a191d483178..b06221e3195 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -855,6 +855,8 @@ static void __init init_intel(struct cpuinfo_x86 *c)
if (c->x86 == 15)
c->x86_cache_alignment = c->x86_clflush_size * 2;
+ if (c->x86 >= 15)
+ set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
}
void __init get_cpu_vendor(struct cpuinfo_x86 *c)
@@ -1055,7 +1057,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
/* Other (Linux-defined) */
- "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr", NULL, NULL, NULL, NULL,
+ "cxmmx", NULL, "cyrix_arr", "centaur_mcr", "k8c+",
+ "constant_tsc", NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 3bafe438fa7..c7a1b50b4af 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -614,6 +614,9 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
struct cpufreq_freqs *freq = data;
unsigned long *lpj, dummy;
+ if (cpu_has(&cpu_data[freq->cpu], X86_FEATURE_CONSTANT_TSC))
+ return 0;
+
lpj = &dummy;
if (!(freq->flags & CPUFREQ_CONST_LOOPS))
#ifdef CONFIG_SMP
@@ -622,8 +625,6 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
lpj = &boot_cpu_data.loops_per_jiffy;
#endif
-
-
if (!ref_freq) {
ref_freq = freq->old;
loops_per_jiffy_ref = *lpj;