X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fbackend_internal.h;h=36d53dfd531357037501a539cd8c991c9d2ca4d9;hb=7c2caf2b9750e82bf14e6ff39e517afef593c2fe;hp=dbe34fc1e4419dbee03d2993c115d140582c2f78;hpb=b728d87e617189fe9898a9492a559ecf949d2348;p=lttng-ust.git

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index dbe34fc1..36d53dfd 100644
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -416,6 +416,10 @@ int update_read_sb_index(const struct lttng_ust_lib_ring_buffer_config *config,
 	return 0;
 }
 
+#ifndef inline_memcpy
+#define inline_memcpy(dest, src, n)	memcpy(dest, src, n)
+#endif
+
 /*
  * Use the architecture-specific memcpy implementation for constant-sized
  * inputs, but rely on an inline memcpy for length statically unknown.
@@ -471,4 +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 */