From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Borntraeger <borntraeger@de.ibm.com>
Subject: Re: [PATCH] autofs4: fix compilation without CONFIG_COMPAT
Date: Mon, 27 Feb 2012 08:29:25 +0100
Message-ID: <4F4B30D5.6050305@de.ibm.com>
References: <CA+55aFzhS69QSoN1j+Z2md116u+3OfniAoE0QMo6xyBjDyjbEw@mail.gmail.com> <20120221.221609.218135609185671883.davem@davemloft.net> <CA+55aFwvmZGDzO_8wwYfH8HsLE=qCmLkJfeMyCe4PVvOYbDMHQ@mail.gmail.com> <CA+55aFzv3X3yW8WZGMZO+aKa=qWi2w8=zn2DP-Q3jRry8Ermyw@mail.gmail.com> <CA+55aFyh1NmBt0LwR3+iD6B-Xa8wAs-nGJ0MBouPhTzWUi8W5g@mail.gmail.com> <1329889428.2193.45.camel@perseus.themaw.net> <1329890027.2193.48.camel@perseus.themaw.net> <1329890251.2193.50.camel@perseus.themaw.net> <m2vcmuh8dg.fsf_-_@igel.home> <CA+55aFxH4_gucG7vpdV5NJPNHoXy5bSGtr0yHqmobvYO6PmjNw@mail.gmail.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>, Ian Kent <raven@themaw.net>, David Miller <davem@davemloft.net>, linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>, autofs@vger.kernel.org, Thomas Meyer <thomas@m3y3r.de>, Al Viro <viro@zeniv.linux.org.uk>, Heiko Carstens <heiko.carstens@de.ibm.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>

On 26/02/12 02:31, Linus Torvalds wrote:
>  
> +#else
> +
> +#define is_compat_task() (0)
> +

Linus,

this breaks 32bit builds of s390 (and maybe others), since several platforms already
define a is_compat_task. This macro then destroys the definition of the function
making

static inline int is_compat_task(void)
{
        return 0;
}


into

static inline int 0
{
        return 0;
}

e.g.

In file included from arch/s390/mm/fault.c:39:0:
/home/autobuild/BUILD/linux-3.3.0-rc5.00060.g203738e.49.x.20120227/arch/s390/include/asm/compat.h:177:38: error: macro "is_compat_task" passed 1 arguments, but takes just 0
/home/autobuild/BUILD/linux-3.3.0-rc5.00060.g203738e.49.x.20120227/arch/s390/include/asm/compat.h:178:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
  CC      arch/s390/kernel/time.o




Christian