* Zhang Yanfei <zhangyanfei.yes@xxxxxxxxx> wrote: > @@ -153,11 +153,18 @@ config MOVABLE_NODE > help > Allow a node to have only movable memory. Pages used by the kernel, > such as direct mapping pages cannot be migrated. So the corresponding > + memory device cannot be hotplugged. This option allows the following > + two things: > + - When the system is booting, node full of hotpluggable memory can > + be arranged to have only movable memory so that the whole node can > + be hotplugged. (need movable_node boot option specified). So this is _exactly_ what I complained about earlier: why is the movable_node boot option needed to get that extra functionality? It's clearly not just a drop-in substitute to CONFIG_MOVABLE_NODE but extends its functionality, right? Boot options are _very_ poor user interface. If you don't want to enable it by default then turn this sub-functionality into CONFIG_MOVABLE_NODE_AUTO and keep it default-off - but don't pretend that this is only about CONFIG_MOVABLE_NODE alone - it isnt: as described above the 'movable_node' is needed for the full functionality to be available! Thanks, Ingo -- 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>