On Wed, 2019-05-15 at 06:20 +0000, Christophe Leroy wrote: Confirming this works on hash and radix book3s64.
> + > + // only operate on VM areas for now > + area = find_vm_area((void *)addr); > + if (!area || end > (unsigned long)area->addr + area->size || > + !(area->flags & VM_ALLOC)) > + return -EINVAL; https://lore.kernel.org/patchwork/project/lkml/list/?series=391470 With this patch, the above series causes crashes on (at least) Hash, since it adds another user of change_page_rw() and change_page_nx() that for reasons I don't understand yet, we can't handle. I can work around this with: if (area->flags & VM_FLUSH_RESET_PERMS) return 0; so this is broken on at least one platform as of 5.2-rc1. We're going to look into this more to see if there's anything else we have to do as a result of this series before the next merge window, or if just working around it like this is good enough. - Russell
