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Date:   Fri, 15 Feb 2019 11:58:35 -0500
From:   Willem de Bruijn <>
To:     Alexey Kodanev <>
Cc:     Network Development <>,
        Petr Vorel <>, David Miller <>
Subject: Re: [PATCH net] sock: return uapi errno in sock_setsockopt() for SO_ZEROCOPY

On Fri, Feb 15, 2019 at 11:51 AM Alexey Kodanev
<> wrote:
> For unsupported protocols, setsockopt() with SO_ZEROCOPY
> option sets errno to ENOTSUPP(524). But this number is
> not defined anywhere in the include/uapi/ headers.
> To make sure userspace sees the known number, replace
> ENOTSUPP(524) with EOPNOTSUPP(95).
> Fixes: 76851d1212c1 ("sock: add SOCK_ZEROCOPY sockopt")
> Signed-off-by: Alexey Kodanev <>
> Reported-by: Petr Vorel <>

This code has been there since 4.14. I think it's too late to change
system call behavior.

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