linux-kernel - [PATCH] x86: fix cpu MHz reporting for AMD family 0x11

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Message-ID: <20080125122834.GA6978@alberich.amd.com>
Date:	Fri, 25 Jan 2008 13:28:34 +0100
From:	"Andreas Herrmann3" <andreas.herrmann3@....com>
To:	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: fix cpu MHz reporting for AMD family 0x11

Fix cpu MHz reporting for AMD family 0x11 when powernow-k8 is
disabled.

Just adhere to the CONSTANT_TSC feature bit for AMD CPUs when deciding
whether cpu_khz needs calibration. The additional check for CPU family
is not needed and prevents calibration for future CPUs.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>

---
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index 61b17f5..0380795 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -120,8 +120,7 @@ void __init time_init(void)
 
 	cpu_khz = tsc_khz;
 	if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) &&
-		boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
-		boot_cpu_data.x86 == 16)
+		(boot_cpu_data.x86_vendor == X86_VENDOR_AMD))
 		cpu_khz = calculate_cpu_khz();
 
 	if (unsynchronized_tsc())



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