linux-kernel - Re: [RFC PATCH 23/28] algif: Remove hash

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Date:   Fri, 17 Mar 2023 10:40:11 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David Howells <dhowells@...hat.com>
Cc:     willy@...radead.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, dhowells@...hat.com,
        viro@...iv.linux.org.uk, hch@...radead.org, axboe@...nel.dk,
        jlayton@...nel.org, brauner@...nel.org,
        torvalds@...ux-foundation.org, netdev@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC PATCH 23/28] algif: Remove hash_sendpage*()

David Howells <dhowells@...hat.com> wrote:
> Remove hash_sendpage*() and use hash_sendmsg() as the latter seems to just
> use the source pages directly anyway.

...

> -       if (!(flags & MSG_MORE)) {
> -               if (ctx->more)
> -                       err = crypto_ahash_finup(&ctx->req);
> -               else
> -                       err = crypto_ahash_digest(&ctx->req);

You've just removed the optimised path from user-space to
finup/digest.  You need to add them back to sendmsg if you
want to eliminate sendpage.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt