tools lib: Add bitmap_and function

Add support to perform logical and on bitmaps.  Code taken from kernel's
include/linux/bitmap.h.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1470074555-24889-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 5c7e3185507c..38748b0e342f 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -58,3 +58,18 @@ size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
         }
         return ret;
 }
+
+int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
+                 const unsigned long *bitmap2, unsigned int bits)
+{
+        unsigned int k;
+        unsigned int lim = bits/BITS_PER_LONG;
+        unsigned long result = 0;
+
+        for (k = 0; k < lim; k++)
+                result |= (dst[k] = bitmap1[k] & bitmap2[k]);
+        if (bits % BITS_PER_LONG)
+                result |= (dst[k] = bitmap1[k] & bitmap2[k] &
+                           BITMAP_LAST_WORD_MASK(bits));
+        return result != 0;
+}