From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Berg <johannes@sipsolutions.net>
Subject: __sk_buff.data_end
Date: Wed, 19 Apr 2017 23:31:00 +0200
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Cc: netdev <netdev@vger.kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>
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Hi Alexei, Daniel,

I'm looking at adding the __wifi_sk_buff I talked about, and I notice
that it uses CB space to store data_end. Unfortunately, in a lot of
cases, we don't have any CB space to spare in wifi.

Is there any way to generate a series of instructions that instead does
the necessary calculations? I don't actually *see* such a way, because
I don't see how I could have a scratch register or scratch stack space,
but perhaps there's a way to do it?

johannes