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diff --git a/sys/sys/bus.h b/sys/sys/bus.h
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -945,6 +945,17 @@
*/
#define __BUS_ACCESSOR(varp, var, ivarp, ivar, type) \
\
+static __inline bool \
+varp ## _has_ ## var(device_t dev) \
+{ \
+ uintptr_t v = 0; \
+ int e; \
+ \
+ e = BUS_READ_IVAR(device_get_parent(dev), dev, \
+ ivarp ## _IVAR_ ## ivar, &v); \
+ return (e == 0); \
+} \
+ \
static __inline type \
varp ## _get_ ## var(device_t dev) \
{ \

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