linux-kernel - Re: [PATCH 1/4] kernel: constructor support

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Message-ID: <20090507134813.GO28398@elte.hu>
Date:	Thu, 7 May 2009 15:48:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Huang Ying <ying.huang@...el.com>, Li Wei <W.Li@....COM>,
	Michael Ellerman <michaele@....ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Sam Ravnborg <sam@...nborg.org>, Jeff Dike <jdike@...toit.com>
Subject: Re: [PATCH 1/4] kernel: constructor support


* Peter Oberparleiter <oberpar@...ux.vnet.ibm.com> wrote:

> Ingo Molnar wrote:
>> * Peter Oberparleiter <oberpar@...ux.vnet.ibm.com> wrote:
>>
>>> Disable constructor support for usermode Linux to prevent conflicts
>>> with host glibc.
>>
>>> +++ linux-2.6.30-rc4/init/Kconfig
>>> @@ -16,6 +16,11 @@ config DEFCONFIG_LIST
>>>  	default "$ARCH_DEFCONFIG"
>>>  	default "arch/$ARCH/defconfig"
>>>  +config CONSTRUCTORS
>>> +	bool
>>> +	depends on !UML
>>> +	default y
>>> +
>>>  menu "General setup"
>>
>> Hm, excluding UML like that is sad. Is there no better solution?
>
> UML is excluded because in that environment constructors are 
> called by the host glibc, so there is no need for kernel support 
> on UML (in fact it would break things).
>
> Or were you referring to the actual way the exclusion is 
> implemented?

the way it's done is OK (there's really just UML in this situation), 
but the question is really, shouldnt it be possible to coverage-test 
UML instances 'from the inside'?

Plus, if any other kernel facility grows out of this or makes use of 
it, UML will be left out in the cold.

	Ingo
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