From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
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 <ak@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/amd.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 2c02d92..cb72014 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -116,7 +116,7 @@ static void __cpuinit init_amd_k6(struct cpuinfo_x86 *c)
*/
n = K6_BUG_LOOP;
- f_vide = vide;
+ asm("" : "=r" (f_vide) : "0" (vide));
rdtscl(d);
while (n--)
f_vide();
--
1.7.7.6
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