D6226.id15964.diff
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	Index: sys/sys/_bitset.h
	===================================================================
	--- sys/sys/_bitset.h
	+++ sys/sys/_bitset.h
	@@ -58,4 +58,12 @@
	#define BITSET_FSET(n) \
	[ 0 ... ((n) - 1) ] = (-1L)

	+/*
	+ * Helper to declare a bitset without it's size being a constant.
	+ *
	+ * Sadly we cannot declare a bitset struct with '__bits[]', because it's
	+ * the only member of the struct and the compiler complains.
	+ */
	+#define BITSET_DEFINE_VAR(t) BITSET_DEFINE(t, 1)
	+
	#endif /* !_SYS__BITSET_H_ */
	Index: sys/sys/bitset.h
	===================================================================
	--- sys/sys/bitset.h
	+++ sys/sys/bitset.h
	@@ -185,5 +185,13 @@
	__count += __bitcountl((p)->__bits[__i]); \
	__count; \
	})
	-
	+
	+/*
	+ * Dynamically allocate a bitset.
	+ *
	+ * NB: p must be cleaned by the caller by freeing it after use.
	+ */
	+#define BITSET_ALLOC(p, _s, mt, mf) \
	+ p = malloc(__bitset_words(_s) * sizeof(long), mt, mf)
	+
	#endif /* !_SYS_BITSET_H_ */