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path: root/arch/x86/oprofile/op_model_ppro.c
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Diffstat (limited to 'arch/x86/oprofile/op_model_ppro.c')
-rw-r--r--arch/x86/oprofile/op_model_ppro.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
index 10131fbdaad..4da7230b3d1 100644
--- a/arch/x86/oprofile/op_model_ppro.c
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -18,7 +18,7 @@
#include <asm/msr.h>
#include <asm/apic.h>
#include <asm/nmi.h>
-#include <asm/intel_arch_perfmon.h>
+#include <asm/perf_counter.h>
#include "op_x86_model.h"
#include "op_counter.h"
@@ -136,6 +136,13 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
u64 val;
int i;
+ /*
+ * This can happen if perf counters are in use when
+ * we steal the die notifier NMI.
+ */
+ if (unlikely(!reset_value))
+ goto out;
+
for (i = 0 ; i < num_counters; ++i) {
if (!reset_value[i])
continue;
@@ -146,6 +153,7 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
}
}
+out:
/* Only P6 based Pentium M need to re-unmask the apic vector but it
* doesn't hurt other P6 variant */
apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);