linux-kernel - Re: [PATCHv2] SO_ZEROCOPY should return -EOPNOTSUPP rather than -ENOTSUPP

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Date:   Mon, 7 Mar 2022 18:27:56 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Samuel Thibault <samuel.thibault@...ri.fr>, davem@...emloft.net,
        kuba@...nel.org,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        linux-kernel@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCHv2] SO_ZEROCOPY should return -EOPNOTSUPP rather than -ENOTSUPP

On Mon, Mar 7, 2022 at 5:31 PM Samuel Thibault <samuel.thibault@...ri.fr> wrote:
>
> ENOTSUPP is documented as "should never be seen by user programs",
> and thus not exposed in <errno.h>, and thus applications cannot safely
> check against it (they get "Unknown error 524" as strerror). We should
> rather return the well-known -EOPNOTSUPP.
>
> This is similar to 2230a7ef5198 ("drop_monitor: Use correct error
> code") and 4a5cdc604b9c ("net/tls: Fix return values to avoid
> ENOTSUPP"), which did not seem to cause problems.
>
> Signed-off-by: Samuel Thibault <samuel.thibault@...ri.fr>

Acked-by: Willem de Bruijn <willemb@...gle.com>

>From what I can tell, the first of the two referenced patches went to
net-next, the second one to net and stable. I would suggest only
net-next for this. Else, we should also add a Fixes tag.

Small nit, for future patches: preferred syntax is commit $SHA1
("subject"), including the commit keyword.