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[PATCH] x86-64: Fix C3 timer test

There was a typo in the C3 latency test to decide of the TSC
should be used or not. It used the C2 latency threshold, not the
C3 one. Fix that.

This should fix the time on various dual core laptops.

Signed-off-by: Andi Kleen <ak@suse.de>
Andi Kleen 19 年之前
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共有 1 个文件被更改,包括 1 次插入1 次删除
  1. 1 1
      arch/x86_64/kernel/time.c

+ 1 - 1
arch/x86_64/kernel/time.c

@@ -948,7 +948,7 @@ __cpuinit int unsynchronized_tsc(void)
  	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
  	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
 #ifdef CONFIG_ACPI
 #ifdef CONFIG_ACPI
 		/* But TSC doesn't tick in C3 so don't use it there */
 		/* But TSC doesn't tick in C3 so don't use it there */
-		if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 100)
+		if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 1000)
 			return 1;
 			return 1;
 #endif
 #endif
  		return 0;
  		return 0;