On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@xxxxxxxxxx> wrote: > So when memory hotplug removes a piece of physical memory from pagetable > mappings, it also frees the underlying PGD entry. > > This complicates PGD management, so don't do this. We can keep the > PGD mapped and the PUD table all clear - it's only a single 4K page > per 512 GB of memory hotplugged. Ressurecting an ancient thread: I want this particular change to make it (much) easier to make vmapped stacks work correctly. Could it be applied by itself? --Andy -- 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>