X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fbackend_internal.h;h=36d53dfd531357037501a539cd8c991c9d2ca4d9;hb=35897f8b2d311b756b81657dad9c53ef1c0fad8a;hp=c4fb7604aa18bf9b3018551257dd3be61285b022;hpb=993e8a491eba696a20f91c3688b90f2b155a8c9c;p=lttng-ust.git

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index c4fb7604..36d53dfd 100644
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -475,4 +475,20 @@ static inline int get_count_order(unsigned int count)
 	return order;
 }
 
+static inline
+unsigned int hweight32(unsigned int value)
+{
+	unsigned int r;
+
+	r = value;
+	r = r - ((r >> 1) & 0x55555555);
+	r = (r & 0x33333333) + ((r >> 2) & 0x33333333);
+	r += r >> 4;
+	r &= 0x0F0F0F0F;
+	r += r >> 8;
+	r += r >> 16;
+	r &= 0x000000FF;
+	return r;
+}
+
 #endif /* _LINUX_RING_BUFFER_BACKEND_INTERNAL_H */