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diff --git a/sys/sys/_atomic_subword.h b/sys/sys/_atomic_subword.h
--- a/sys/sys/_atomic_subword.h
+++ b/sys/sys/_atomic_subword.h
@@ -205,4 +205,31 @@
#undef _ATOMIC_BYTE_SHIFT
#undef _ATOMIC_HWORD_SHIFT
+static __inline void
+atomic_set_short(volatile u_short *p, u_short bit)
+{
+ u_short v;
+
+ v = atomic_load_short(p);
+ for (;;) {
+ if (atomic_fcmpset_short(p, &v, v | bit))
+ break;
+ }
+}
+
+static __inline void
+atomic_clear_short(volatile u_short *p, u_short bit)
+{
+ u_short v;
+
+ v = atomic_load_short(p);
+ for (;;) {
+ if (atomic_fcmpset_short(p, &v, v & ~bit))
+ break;
+ }
+}
+
+#define atomic_set_16 atomic_set_short
+#define atomic_clear_16 atomic_clear_short
+
#endif /* _SYS__ATOMIC_SUBWORD_H_ */

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