[PATCH] x86/kernel/cpu/amd.c: use indirect call

[Mikulas Patocka]

This old piece of code is supposed to measure the performance of indirect
calls to determine if the processor is buggy or not, however the compiler
optimizer turns it into a direct call.

Use the macro OPTIMIZER_HIDE_VAR to thwart the optimization, so that real 
indirect call is generated.

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>

---
 arch/x86/kernel/cpu/amd.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/arch/x86/kernel/cpu/amd.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/amd.c
+++ linux-2.6/arch/x86/kernel/cpu/amd.c
@@ -134,6 +134,7 @@ static void init_amd_k6(struct cpuinfo_x
 
 		n = K6_BUG_LOOP;
 		f_vide = vide;
+		OPTIMIZER_HIDE_VAR(f_vide);
 		d = rdtsc();
 		while (n--)
 			f_vide();