linux-kernel - [PATCH 2/4] x86, CPU: Extend TLB size detection for AMD

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Date:	Fri,  3 Aug 2012 18:37:47 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alex Shi <alex.shi@...el.com>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH 2/4] x86, CPU: Extend TLB size detection for AMD

From: Borislav Petkov <borislav.petkov@....com>

TLB characteristics on AMD are in the extended CPUID level, leafs
0x8000000{5,6} so we need to check those before doing the detection.

Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
 arch/x86/kernel/cpu/common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d239977f361f..ebab0e77e691 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -940,7 +940,8 @@ void __init identify_boot_cpu(void)
 #else
 	vgetcpu_set_mode();
 #endif
-	if (boot_cpu_data.cpuid_level >= 2)
+	if (boot_cpu_data.cpuid_level >= 2 ||
+	    boot_cpu_data.extended_cpuid_level >= 0x80000006)
 		cpu_detect_tlb(&boot_cpu_data);
 }
 
-- 
1.7.11.rc1

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