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

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Date:	Mon, 27 Feb 2012 08:22:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	Christian Borntraeger <borntraeger@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	Ian Kent <raven@...maw.net>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, autofs@...r.kernel.org,
	Thomas Meyer <thomas@...3r.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] autofs4: fix compilation without CONFIG_COMPAT

On 02/27/2012 01:09 AM, Heiko Carstens wrote:
> On Mon, Feb 27, 2012 at 08:29:25AM +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.
>
> It breaks only !COMPAT builds on s390, since only we have the is_compat_task()
> function defined for !COMPAT. The reason for that was simply to get rid of a
> couple of ugly  #ifdefs.
> Note, that we still need to include asm/compat.h in some file since we need the
> compat_ptr typedef.
> That might be ugly, but I preferred including that header file so we could get
> rid of the #ifdefs.
> Anyway... the patch below fixes the build issues:
>

This patch would seem to be The Right Thing; the combination of this 
really takes what s390 has done in arch space and globalizes it.

	-hpa

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