[tip:perf/urgent] tools lib: Add bitmap_alloc function

[tip-bot for Jiri Olsa <tipbot@zytor.com>]

Commit-ID:  98c032967a299ee4bf14ef19eded02b65df32e6f
Gitweb:     http://git.kernel.org/tip/98c032967a299ee4bf14ef19eded02b65df32e6f
Author:     Jiri Olsa <jolsa@redhat.com>
AuthorDate: Tue, 2 Aug 2016 13:33:02 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 2 Aug 2016 16:33:26 -0300

tools lib: Add bitmap_alloc function

Adding bitmap_alloc function to dynamically allocate bitmap.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20160802113302.GA7479@krava
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/include/linux/bitmap.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 28f5493..60c44b6 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -3,6 +3,7 @@
 
 #include <string.h>
 #include <linux/bitops.h>
+#include <stdlib.h>
 
 #define DECLARE_BITMAP(name,bits) \
 	unsigned long name[BITS_TO_LONGS(bits)]
@@ -65,4 +66,13 @@ static inline int test_and_set_bit(int nr, unsigned long *addr)
 	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 */