From: Andi Kleen <a...@linux.intel.com>
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 <a...@linux.intel.com>
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));
rdtscl(d);
while (n--)
f_vide();
--
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