linux-kernel - Re: [PATCH v2 6/8] socket: Add SO_TIMESTAMP[NS]

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Date:   Wed, 12 Dec 2018 10:35:23 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        jejb@...isc-linux.org, ralf@...ux-mips.org, rth@...ddle.net,
        linux-alpha@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-parisc@...r.kernel.org, linux-rdma@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 6/8] socket: Add SO_TIMESTAMP[NS]_NEW

> This did not address yet the previous comments on consistency and
> unnecessary code churn.
>
> The existing logic to differentiate SO_TIMESTAMP from SO_TIMESTAMPNS
> in both tcp_recv_timestamp and __sock_recv_timestamp is
>
>   if (sock_flag(sk, SOCK_RCVTSTAMP)) {
>       if (sock_flag(sk, SOCK_RCVTSTAMPNS))
>           /* timespec case */
>       else
>           /* timeval case */
>   }
>
> A new level of nesting needs to be added to differentiate .._OLD from .._NEW.
>
> Even if massively changing the original functions, please do so
> consistently, either
>
>   if (sock_flag(sk, SOCK_RCVTSTAMP)) {
>       if (sock_flag(sk, SOCK_TSTAMP_NEW) {
>           /* new code */
>       } else {
>           if (sock_flag(sk, SOCK_RCVTSTAMPNS))
>               /* timespec case */
>           else
>               /* timeval case */
>      }
>   }

This first example is wrong. I meant

   if (sock_flag(sk, SOCK_RCVTSTAMP)) {
       if (sock_flag(sk, SOCK_RCVTSTAMPNS)) {
           if (sock_flag(sk, SOCK_TSTAMP_NEW)
                /* new code */
          else
                /* timespec case */
       } else {
           if (sock_flag(sk, SOCK_TSTAMP_NEW)
                /* new code */
          else
                /* timeval case */
        }
   }