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Date:   Wed, 22 Nov 2023 16:52:43 +0000
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From:   "Konstantin Ryabitsev" <konstantin.ryabitsev@linux.dev>
Message-ID: <ddeefd4d0323df0948565fea2ffb55793fdcc8dc@linux.dev>
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Subject: Re: [PATCH] x86/hyperv: Use atomic_try_cmpxchg() to micro-optimize
 hv_nmi_unknown()
To:     "Wei Liu" <wei.liu@kernel.org>, "Uros Bizjak" <ubizjak@gmail.com>
Cc:     linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
        tools@linux.kernel.org
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 <20231114170038.381634-1-ubizjak@gmail.com>
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November 21, 2023 at 10:51 PM, "Wei Liu" <wei.liu@kernel.org> wrote:
> Uros, just so you know, DKIM verification failed when I used b4 to appl=
y
> this patch. You may want to check your email setup.

This is not actually Uros's fault. Recently, Gmail started adding a force=
d expiration field to their DKIM signatures, via the x=3D field:

    DKIM-Signature: v=3D1; a=3Drsa-sha256; c=3Drelaxed/relaxed;
        d=3Dgmail.com; s=3D20230601; t=3D1699981249; x=3D1700586049; darn=
=3Dvger.kernel.org;
                                               ^^^^^^^^^^^^^

This gives the signature an enforced validity of only 7 days. Since the o=
riginal message was sent on November 14 and you're retrieving it on Novem=
ber 21, this causes the DKIM check to fail.

I need to figure out how to make b4 ignore the x=3D field, because it's n=
ot relevant for our purposes, but the library we're using for DKIM doesn'=
t currently have any mechanism to do so. I will open an RFE with them in =
the hopes that we can get this implemented.

Regards,
-K