linux-kernel - Re: [PATCH 2/8] sockopt: Rename SO_TIMESTAMP* to SO_TIMESTAMP*

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Message-ID: <CABeXuvr7M4z6-7qsnBZqnXQEcGxfgVddGmsoV=iLwA-n=S5VkQ@mail.gmail.com>
Date:   Fri, 30 Nov 2018 14:38:27 -0800
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     willemdebruijn.kernel@...il.com
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Network Devel Mailing List <netdev@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Helge Deller <deller@....de>,
        David Howells <dhowells@...hat.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Ralf Baechle <ralf@...ux-mips.org>, rth@...ddle.net,
        linux-afs@...ts.infradead.org, linux-alpha@...r.kernel.org,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linux-rdma@...r.kernel.org, sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 2/8] sockopt: Rename SO_TIMESTAMP* to SO_TIMESTAMP*_OLD

On Sat, Nov 24, 2018 at 7:59 PM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> On Sat, Nov 24, 2018 at 3:58 AM Deepa Dinamani <deepa.kernel@...il.com> wrote:
> >
> > SO_TIMESTAMP, SO_TIMESTAMPNS and SO_TIMESTAMPING options, the
> > way they are currently defined, are not y2038 safe.
> > Subsequent patches in the series add new y2038 safe versions
> > of these options which provide 64 bit timestamps on all
> > architectures uniformly.
> > Hence, rename existing options with OLD tag suffixes.
>
> Why do the existing interfaces have to be renamed when new interfaces are added?

Existing options need to be renamed because of the macro below:

#define SO_TIMESTAMP (sizeof(time_t) == sizeof(__kernel_long_t) ? \
            SO_TIMESTAMP_OLD : SO_TIMESTAMP_NEW)

SO_TIMESTAMP is now dependent on size of time_t because of the libc flag.

-Deepa