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From:   Vlad Dronov <vdronov@redhat.com>
Date:   Tue, 5 Jul 2022 14:07:40 +0200
Message-ID: <CAMusb+RLB6-oz10yp9Cdigt0TeJ_85M30bH8snZaeM2CyvUiYA@mail.gmail.com>
Subject: Re: [PATCH] wireguard: Kconfig: select CRYPTO_CHACHA_S390
To:     "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Harald Freudenberger <freude@linux.ibm.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        wireguard@lists.zx2c4.com, netdev@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>
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Hi,

On Tue, Jul 5, 2022 at 3:51 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> On Tue, Jul 05, 2022 at 02:49:19AM +0200, Jason A. Donenfeld wrote:
> > Hi Vladis,
> >
> > On Mon, Jul 04, 2022 at 09:15:35PM +0200, Vladis Dronov wrote:
> > > Select the new implementation of CHACHA20 for S390 when available,
> > > it is faster than the generic software implementation.
> > >
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Link: https://lore.kernel.org/linux-kernel/202207030630.6SZVkrWf-lkp@intel.com/
> > > Signed-off-by: Vladis Dronov <vdronov@redhat.com>
> > > ... skip ...
> >
> > Thanks for the patch. Queued up as:
> > https://git.zx2c4.com/wireguard-linux/commit/?id=1b4ab028730cd00c144eaa51160865504b780961
> >
> > I'll include this in my series to net.git soon.

Thanks a ton, Jason!
Most appreciated.

> This actually leads to a minor problem:
>
>   WARNING: unmet direct dependencies detected for CRYPTO_CHACHA_S390
>     Depends on [n]: CRYPTO [=y] && CRYPTO_HW [=n] && S390 [=y]
>
> This is of course harmless, since this doesn't *actually* depend on
> CRYPTO_HW. In fact, the dependency on CRYPTO_HW is entirely a mistake
> here that was repeated a few times. I cleaned this up and fixed it in
> this patch:
>
>     https://lore.kernel.org/linux-crypto/20220705014653.111335-1-Jason@zx2c4.com/
>
> So hopefully Herbert will take that for 5.19 and then we'll be all set
> here.
>
> Jason

Whoa, that's... funny. Honestly, I was always wondering why CRYPTO_CHACHA_S390
and friends live in drivers/crypto/Kconfig. Now I know why. The patch
looks great, thank you.

Best regards,
Vladis Dronov | Red Hat, Inc. | The Core Kernel | Senior Software Engineer