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diff --git a/sys/sys/pmc.h b/sys/sys/pmc.h
--- a/sys/sys/pmc.h
+++ b/sys/sys/pmc.h
@@ -1069,6 +1069,12 @@
extern struct pmc_driverstats pmc_stats;
#if defined(HWPMC_DEBUG)
+
+/* HWPMC_DEBUG without KTR will compile but is a no-op. */
+#if !defined(KTR) || !defined(KTR_COMPILE) || ((KTR_COMPILE & KTR_SUBSYS) == 0)
+#error "HWPMC_DEBUG requires KTR and KTR_COMPILE=KTR_SUBSYS -- see ktr(4)"
+#endif
+
#include <sys/ktr.h>
#define __pmcdbg_used /* unused variable annotation */

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