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-rw-r--r--arch/x86/oprofile/op_model_athlon.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_model_athlon.c b/arch/x86/oprofile/op_model_athlon.c
index a3a2058c372..9c8c8c58313 100644
--- a/arch/x86/oprofile/op_model_athlon.c
+++ b/arch/x86/oprofile/op_model_athlon.c
@@ -251,6 +251,7 @@ op_amd_handle_ibs(struct pt_regs * const regs,
(unsigned int *)&ibs_op,
IBS_OP_BEGIN);
rdmsr(MSR_AMD64_IBSOPCTL, low, high);
+ high = 0;
low &= ~IBS_OP_LOW_VALID_BIT;
low |= IBS_OP_LOW_ENABLE;
wrmsr(MSR_AMD64_IBSOPCTL, low, high);