Remove core.h

[lttng-ust.git] / libringbuffer / backend_internal.h

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index c4fb7604aa18bf9b3018551257dd3be61285b022..36d53dfd531357037501a539cd8c991c9d2ca4d9 100644 (file)
--- 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 */