On Wed, Oct 22, 2014 at 03:44:16PM +0200, Peter Zijlstra wrote: > On Wed, Oct 22, 2014 at 02:15:54PM +0200, Peter Zijlstra wrote: > > On Wed, Oct 22, 2014 at 02:53:04PM +0300, Kirill A. Shutemov wrote: > > > Em, no. In this case change_protection() will not touch the pte, since > > > it's pte_none() and the pte_same() check will pass just fine. > > > > Oh, that's what you meant. Yes that's a problem, yes vm_page_prot > > needs wrapping too. > > Maybe also vm_policy, is there anything else that can change while a vma > lives? - vm_flags, obviously; - shared, anon_vma and anon_vma_chain (at least on the first write fault to private mapping); - vm_pgoff (mremap(2) ?); - vm_private_data -- it's all over drivers. Potential nightmare, but seems not in use for anon mappings. -- Kirill A. Shutemov -- 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>