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-rw-r--r--tools/perf/util/bitmap.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/util/bitmap.c b/tools/perf/util/bitmap.c
new file mode 100644
index 000000000000..5e230acae1e9
--- /dev/null
+++ b/tools/perf/util/bitmap.c
@@ -0,0 +1,21 @@
+/*
+ * From lib/bitmap.c
+ * Helper functions for bitmap.h.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+#include <linux/bitmap.h>
+
+int __bitmap_weight(const unsigned long *bitmap, int bits)
+{
+ int k, w = 0, lim = bits/BITS_PER_LONG;
+
+ for (k = 0; k < lim; k++)
+ w += hweight_long(bitmap[k]);
+
+ if (bits % BITS_PER_LONG)
+ w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits));
+
+ return w;
+}