Re: [PATCH] crypto: lib/chacha20poly1305 - Set SG_MITER_ATOMIC unconditionally

[Herbert Xu]

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