* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > <reads the code> > > Oh. We don't do any checking at all. We're just telling > userspace programmers "don't do that". hrm. What are > your thoughts on adding the overlap checks to the kernel? I have requested such sanity checking in previous review as well, it has to be made fool-proof for this optimization to be usable. Another alternative would be to make this not a transparent optimization, but a separate API: ioremap_hugepage() or so. The devices and drivers dealing with GBs of remapped pages is still relatively low, so they could make explicit use of the API and opt in to it. What I was arguing against was to make it a CONFIG_ option: that achieves very little in practice, such APIs should be uniformly available. Thanks, Ingo -- 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>