On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mi...@kernel.org> 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
