Messages in this thread Patch in this message | | | Date | Tue, 11 Jul 2017 07:44:05 -0400 (EDT) | From | Mikulas Patocka <> | Subject | [PATCH] x86/kernel/cpu/amd.c: use indirect call |
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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@redhat.com>
--- 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();
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