On Tue, 6 Jun 2023, Jason Gunthorpe wrote: > On Mon, Jun 05, 2023 at 10:11:52PM -0700, Hugh Dickins wrote: > > > "deposited" pagetable fragments, over in arch/s390/mm/pgtable.c: use > > the first two longs of the page table itself for threading the list. > > It is not RCU anymore if it writes to the page table itself before the > grace period, so this change seems to break the RCU behavior of > page_table_free_rcu().. The rcu sync is inside tlb_remove_table() > called after the stores. Yes indeed, thanks for pointing that out. > > Maybe something like an xarray on the mm to hold the frags? I think we can manage without that: I'll say slightly more in reply to Gerald. Hugh
