dyn0dyn.h:

  dyn_array_open(): mention the size limit
mtr0log.ic, mtr0log.h:
  mlog_open(): mention the size limit

innobase/include/dyn0dyn.h

@@ -47,7 +47,8 @@ dyn_array_open(
 /*===========*/
 				/* out: pointer to the buffer */
 	dyn_array_t*	arr,	/* in: dynamic array */
-	ulint		size);	/* in: size in bytes of the buffer */
+	ulint		size);	/* in: size in bytes of the buffer; MUST be
+				smaller than DYN_ARRAY_DATA_SIZE! */
 /*************************************************************************
 Closes the buffer returned by dyn_array_open. */
 UNIV_INLINE

innobase/include/mtr0log.h

@@ -98,7 +98,8 @@ mlog_open(
 /*======*/
 			/* out: buffer, NULL if log mode MTR_LOG_NONE */
 	mtr_t*	mtr,	/* in: mtr */
-	ulint	size);	/* in: buffer size in bytes */
+	ulint	size);	/* in: buffer size in bytes; MUST be
+			smaller than DYN_ARRAY_DATA_SIZE! */
 /************************************************************
 Closes a buffer opened to mlog. */
 UNIV_INLINE

innobase/include/mtr0log.ic

@@ -18,7 +18,8 @@ mlog_open(
 /*======*/
 			/* out: buffer, NULL if log mode MTR_LOG_NONE */
 	mtr_t*	mtr,	/* in: mtr */
-	ulint	size)	/* in: buffer size in bytes */
+	ulint	size)	/* in: buffer size in bytes; MUST be
+			smaller than DYN_ARRAY_DATA_SIZE! */
 {
 	dyn_array_t*	mlog;