diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -1655,7 +1655,8 @@
 static int
 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
 {
-	return (sysctl_handle_opaque(oidp, intrnames, sintrnames, req));
+	return (sysctl_handle_opaque(oidp, intrnames,
+	    intrcnt_index * (MAXCOMLEN + 1), req));
 }
 
 SYSCTL_PROC(_hw, OID_AUTO, intrnames,
@@ -1673,18 +1674,22 @@
 
 	if (req->flags & SCTL_MASK32) {
 		if (!req->oldptr)
-			return (sysctl_handle_opaque(oidp, NULL, sintrcnt / 2, req));
-		intrcnt32 = malloc(sintrcnt / 2, M_TEMP, M_NOWAIT);
+			return (sysctl_handle_opaque(oidp, NULL,
+			    intrcnt_index * sizeof(uint32_t), req);
+		intrcnt32 = malloc(intrcnt_index * sizeof(uint32_t), M_TEMP,
+		    M_NOWAIT);
 		if (intrcnt32 == NULL)
 			return (ENOMEM);
-		for (i = 0; i < sintrcnt / sizeof (u_long); i++)
+		for (i = 0; i < intrcnt_index; i++)
 			intrcnt32[i] = intrcnt[i];
-		error = sysctl_handle_opaque(oidp, intrcnt32, sintrcnt / 2, req);
+		error = sysctl_handle_opaque(oidp, intrcnt32,
+		    intrcnt_index * sizeof(uint32_t), req);
 		free(intrcnt32, M_TEMP);
 		return (error);
 	}
 #endif
-	return (sysctl_handle_opaque(oidp, intrcnt, sintrcnt, req));
+	return (sysctl_handle_opaque(oidp, intrcnt,
+	    intrcnt_index * sizeof(u_long), req));
 }
 
 SYSCTL_PROC(_hw, OID_AUTO, intrcnt,
@@ -1704,7 +1709,7 @@
 
 	cp = intrnames;
 	j = 0;
-	for (i = intrcnt; j < (sintrcnt / sizeof(u_long)) && !db_pager_quit;
+	for (i = intrcnt; j < intrcnt_index && !db_pager_quit;
 	    i++, j++) {
 		if (*cp == '\0')
 			break;
diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
--- a/sys/kern/subr_intr.c
+++ b/sys/kern/subr_intr.c
@@ -148,9 +148,7 @@
 /* Data for MI statistics reporting. */
 u_long *intrcnt;
 char *intrnames;
-size_t sintrcnt;
-size_t sintrnames;
-static u_int intrcnt_index;
+u_int intrcnt_index;
 
 static struct intr_irqsrc *intr_map_get_isrc(u_int res_id);
 static void intr_map_set_isrc(u_int res_id, struct intr_irqsrc *isrc);
@@ -184,8 +182,6 @@
 	    M_WAITOK | M_ZERO);
 	intrnames = mallocarray(intrcnt_count, INTRNAME_LEN, M_INTRNG,
 	    M_WAITOK | M_ZERO);
-	sintrcnt = intrcnt_count * sizeof(u_long);
-	sintrnames = intrcnt_count * INTRNAME_LEN;
 	irq_sources = mallocarray(intr_nirq, sizeof(struct intr_irqsrc*),
 	    M_INTRNG, M_WAITOK | M_ZERO);
 }
diff --git a/sys/powerpc/powerpc/intr_machdep.c b/sys/powerpc/powerpc/intr_machdep.c
--- a/sys/powerpc/powerpc/intr_machdep.c
+++ b/sys/powerpc/powerpc/intr_machdep.c
@@ -116,7 +116,6 @@
 	int	base;
 };
 
-static u_int intrcnt_index = 0;
 static struct mtx intr_table_lock;
 static struct powerpc_intr **powerpc_intrs;
 static struct pic piclist[MAX_PICS];
@@ -131,8 +130,7 @@
 
 u_long *intrcnt;
 char *intrnames;
-size_t sintrcnt = sizeof(intrcnt);
-size_t sintrnames = sizeof(intrnames);
+u_int intrcnt_index;
 int nintrcnt;
 
 /*
@@ -181,8 +179,6 @@
 	    M_ZERO);
 	intrnames = mallocarray(nintrcnt, MAXCOMLEN + 1, M_INTR, M_WAITOK |
 	    M_ZERO);
-	sintrcnt = nintrcnt * sizeof(u_long);
-	sintrnames = nintrcnt * (MAXCOMLEN + 1);
 }
 /*
  * This needs to happen before SI_SUB_CPU
diff --git a/sys/sys/interrupt.h b/sys/sys/interrupt.h
--- a/sys/sys/interrupt.h
+++ b/sys/sys/interrupt.h
@@ -162,8 +162,7 @@
 /* Counts and names for statistics (defined in MD code). */
 extern u_long 	*intrcnt;	/* counts for each device and stray */
 extern char 	*intrnames;	/* string table containing device names */
-extern size_t	sintrcnt;	/* size of intrcnt table */
-extern size_t	sintrnames;	/* size of intrnames table */
+extern u_int	intrcnt_index;	/* number of counters/names */
 
 #ifdef DDB
 void	db_dump_intr_event(struct intr_event *ie, int handlers);
diff --git a/sys/x86/x86/intr_machdep.c b/sys/x86/x86/intr_machdep.c
--- a/sys/x86/x86/intr_machdep.c
+++ b/sys/x86/x86/intr_machdep.c
@@ -76,7 +76,6 @@
 
 typedef void (*mask_fn)(void *);
 
-static int intrcnt_index;
 static struct intsrc **interrupt_sources;
 #ifdef SMP
 static struct intsrc **interrupt_sorted;
@@ -97,8 +96,7 @@
 
 u_long *intrcnt;
 char *intrnames;
-size_t sintrcnt = sizeof(intrcnt);
-size_t sintrnames = sizeof(intrnames);
+u_int intrcnt_index;
 int nintrcnt;
 
 static MALLOC_DEFINE(M_INTR, "intr", "Interrupt Sources");
@@ -190,8 +188,6 @@
 	    M_ZERO);
 	intrnames = mallocarray(nintrcnt, MAXCOMLEN + 1, M_INTR, M_WAITOK |
 	    M_ZERO);
-	sintrcnt = nintrcnt * sizeof(u_long);
-	sintrnames = nintrcnt * (MAXCOMLEN + 1);
 
 	/*
 	 * NB: intrpic_lock is not held here to avoid LORs due to