> I have the reason to have to fill the node struct with 0 by memset. > The node is a part of node struct array (node_devices[]). > If we add empty release function for suppressing warning, > some data remains in the node struct after hot removing memory. > So if we re-hot adds the memory, the node struct is reused by > register_onde_node(). But the node struct has some data, because > it was not initialized with 0. As a result, more waning is shown > by the remained data at hot addinig memory as follows: Even though you call memset(0) at offline. It doesn't guarantee the memory keep 0 until online. E.g. physical memory exchange during offline, bit corruption by cosmic ray, etc. So, you should fill zero at online phase explicitly if need. The basic hotplug design is: you should forget everything at offline and you shouldn't assume any initialized data at online. Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>