D6226.diff
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	Index: head/sys/sys/_bitset.h
	===================================================================
	--- head/sys/sys/_bitset.h
	+++ head/sys/sys/_bitset.h
	@@ -47,4 +47,12 @@
	long __bits[__bitset_words((_s))]; \
	}

	+/*
	+ * 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: head/sys/sys/bitset.h
	===================================================================
	--- head/sys/sys/bitset.h
	+++ head/sys/sys/bitset.h
	@@ -199,4 +199,10 @@
	#define BITSET_FSET(n) \
	[ 0 ... ((n) - 1) ] = (-1L)

	+/*
	+ * Dynamically allocate a bitset.
	+ */
	+#define BITSET_ALLOC(_s, mt, mf) \
	+ malloc(__bitset_words(_s) * sizeof(long), mt, (mf))
	+
	#endif /* !_SYS_BITSET_H_ */