tools lib: Add bitmap_alloc function

Adding bitmap_alloc function to dynamically allocate bitmap.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/20160802113302.GA7479@krava
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/include/linux/bitmap.h

···
 
 #include <string.h>
 #include <linux/bitops.h>
+#include <stdlib.h>
 
 #define DECLARE_BITMAP(name,bits) \
 	unsigned long name[BITS_TO_LONGS(bits)]
···
 	*p = old | mask;
 
 	return (old & mask) != 0;
+}
+
+/**
+ * bitmap_alloc - Allocate bitmap
+ * @nr: Bit to set
+ */
+static inline unsigned long *bitmap_alloc(int nbits)
+{
+	return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
 }
 
 #endif /* _PERF_BITOPS_H */