Attachment 291423 Details for Bug 428479 – Fix a TSC bug

[patch] Fix a TSC bug

RHEL5.2_fix_TSC_AMD.patch (text/plain), 1010 bytes, created by Bhavna Sarathy on 2008-01-11 21:55:26 UTC

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Creator: Bhavna Sarathy

Created: 2008-01-11 21:55:26 UTC

Size: 1010 bytes

patch

obsolete

>--- linux-2.6.18.i386/arch/x86_64/kernel/time.c.tscfix	2008-01-11 16:50:42.000000000 -0500
>+++ linux-2.6.18.i386/arch/x86_64/kernel/time.c	2008-01-11 16:52:59.000000000 -0500
>@@ -1022,6 +1022,12 @@ __cpuinit int unsynchronized_tsc(void)
> 	if (apic_is_clustered_box())
> 		return 1;
> #endif
>+
>+	/* AMD systems with constant TSCs have synchronized clocks */
>+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
>+		(boot_cpu_has(X86_FEATURE_CONSTANT_TSC)))
>+	return 0;
>+
> 	/* Most intel systems have synchronized TSCs except for
> 	   multi node systems */
>  	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
>@@ -1029,11 +1035,6 @@ __cpuinit int unsynchronized_tsc(void)
> 		/* But TSC doesn't tick in C3 so don't use it there */
> 		if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 1000)
> 			return 1;
>-
>-		/* AMD systems with constant TSCs have synchronized clocks */
>-		if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && 
>-			(boot_cpu_has(X86_FEATURE_CONSTANT_TSC)))
>-			return 0;
> #endif
>  		return 0;
> 	}

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