linux-kernel - Re: [PATCH] autofs4: fix compilation without CONFIG

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Message-ID: <1330334440.2490.40.camel@perseus.themaw.net>
Date:	Mon, 27 Feb 2012 17:20:40 +0800
From:	Ian Kent <raven@...maw.net>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	autofs@...r.kernel.org, Thomas Meyer <thomas@...3r.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] autofs4: fix compilation without CONFIG_COMPAT

On Mon, 2012-02-27 at 08:29 +0100, Christian Borntraeger wrote:
> 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

It looks like s390 is the only arch that uses a #else (CONFIG_COMPAT) so
maybe it is the only breakage.

Perhaps using a function instead of a define in include/linux/compat.h
and removing the else from arch/s390/include/asm/compat.h is the
sensible thing to do here or maybe just removing the #else from
arch/s390/include/asm/compat.h since it just returns 0 anyway?

> 
> 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
> 


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