linux-kernel - Re: [PATCH] y2038: fix socket.h header inclusion

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Date:   Thu, 14 Mar 2019 19:37:15 +0100
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org, Laura Abbott <labbott@...hat.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH] y2038: fix socket.h header inclusion

* Arnd Bergmann:

> diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h
> index 0d0fddb7e738..976e89b116e5 100644
> --- a/arch/alpha/include/uapi/asm/socket.h
> +++ b/arch/alpha/include/uapi/asm/socket.h
> @@ -2,8 +2,8 @@
>  #ifndef _UAPI_ASM_SOCKET_H
>  #define _UAPI_ASM_SOCKET_H
>  
> +#include <linux/posix_types.h>
>  #include <asm/sockios.h>
> -#include <asm/bitsperlong.h>

This breaks POSIX conformance in glibc because the
<linux/posix_types.h> header is not namespace clean.  It contains the
identifiers fds_bits and val:

	unsigned long fds_bits[__FD_SETSIZE / (8 * sizeof(long))];

        int     val[2];

We could duplicate some of the SO_* constants for POSIX mode in glibc,
but it would be nice to avoid that.

Is there a different way of fixing this on the kernel side that avoids
including <linux/posix_types.h>?