branches/zip: Make Valgrind diagnostics more accurate.

buf_page_init(): Declare block->frame valid only in the system tablespace.

trx_sysf_create(): Declare the rest of the page valid, although it is
uninitialized.

buf/buf0buf.c

@@ -1939,10 +1939,15 @@ buf_page_init(
 
 	/* Set the state of the block */
 	buf_block_set_file_page(block, space, offset);
+
+#ifdef UNIV_DEBUG_VALGRIND
+	if (!space) {
 		/* Silence valid Valgrind warnings about uninitialized
 		data being written to data files.  There are some unused
 		bytes on some pages that InnoDB does not initialize. */
 		UNIV_MEM_VALID(block->frame, UNIV_PAGE_SIZE);
+	}
+#endif /* UNIV_DEBUG_VALGRIND */
 
 	block->check_index_page_at_flush = FALSE;
 	block->index		= NULL;

trx/trx0sys.c

@@ -885,7 +885,16 @@ trx_sysf_create(
 		trx_sysf_rseg_set_page_no(sys_header, i, FIL_NULL, mtr);
 	}
 
-	/* The remaining area (up to the page trailer) is uninitialized. */
+	/* The remaining area (up to the page trailer) is uninitialized.
+	Silence Valgrind warnings about it. */
+	UNIV_MEM_VALID(sys_header + (TRX_SYS_RSEGS
+				     + TRX_SYS_N_RSEGS * TRX_SYS_RSEG_SLOT_SIZE
+				     + TRX_SYS_RSEG_SPACE),
+		       (UNIV_PAGE_SIZE - FIL_PAGE_DATA_END
+			- (TRX_SYS_RSEGS
+			   + TRX_SYS_N_RSEGS * TRX_SYS_RSEG_SLOT_SIZE
+			   + TRX_SYS_RSEG_SPACE))
+		       + page - sys_header);
 
 	/* Create the first rollback segment in the SYSTEM tablespace */
 	page_no = trx_rseg_header_create(TRX_SYS_SPACE, ULINT_MAX, &slot_no,