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Date:	Sat, 20 Apr 2013 20:35:40 -0700
From:	Andi Kleen <>
Cc:, Andi Kleen <>
Subject: [PATCH] x86: Fix AMD K6 indirect call check

From: Andi Kleen <>

The AMD K6 errata check relies on timing a indirect call.
But the way it was written it could be optimized to a direct call.
Force gcc to actually do a indirect call and not just
constant resolve the target address.

Signed-off-by: Andi Kleen <>

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 4a549db..11ea6f6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -115,7 +115,7 @@ static void __cpuinit init_amd_k6(struct cpuinfo_x86 *c)
 		n = K6_BUG_LOOP;
-		f_vide = vide;
+		asm("" : "=g" (f_vide) : "0" (vide));
 		while (n--)
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