On Tue, Sep 15, 2020 at 01:02:10PM +0300, Ard Biesheuvel wrote: > > > I'd rather go for a preemptible/sleepable version of highmem mapping > > which is in itself consistent for both highmen and not highmem. > > I don't think we need to obsess about highmem, although we should > obviously take care not to regress its performance unnecessarily. What > I want to avoid is to burden a brand new subsystem with legacy highmem > baggage simply because we could not agree on how to avoid that. I think what Thomas is proposing should address your concerns Ard. As long as nobody objects to the slight performance degradation on legacy highmem platforms it should make kmap_atomic just go away on modern platforms. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
