linux-kernel - Re: KVM: Export include/linux/kvm.h only if $ARCH actually supports KVM

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Date:	Thu, 13 Mar 2008 12:13:03 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Avi Kivity <avi@...ranet.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: KVM: Export include/linux/kvm.h only if $ARCH actually
	supports KVM

On Thu, Feb 14, Avi Kivity wrote:

> Sam Ravnborg wrote:
>> On Wed, Feb 13, 2008 at 09:43:49AM +0200, Avi Kivity wrote:
>>   
>>> Olaf Hering wrote:
>>>     
>>>>> Currently, make headers_check barfs due to <asm/kvm.h>, which 
>>>>> <linux/kvm.h>
>>>>> includes, not existing.  Rather than add a zillion <asm/kvm.h>s, export 
>>>>> kvm.h
>>>>> only if the arch actually supports it.
>>>>>            
>>>> This makes headers_install_all unreliable.
>>>> linux/kvm.h will not be exported, depending on what system the libc
>>>> headers will be generated.       
>>> I see.  Any suggestions besides adding lots of asm-*/kvm.h?
>>>     
>>
>> Do not include asm/kvm.h from linux/kvm.h.
>> And in the few places where it is needed explicit include asm/kvm.h before
>> linux/kvm.h.
>>
>> Alternatively inlcude asm/kvm.h inside #ifdef KERNEL"
>> so only userspace has to do explicit include of asm before linux variant.
>>   
>
> That's not very nice for userspace, which needs asm/kvm.h for the arch 
> specific parts of the interface.  I'll add asm-*/kvm.h.

Can you please revert this change before 2.6.25 is released?
'make headers_install_all' has to be reliable.

 commit fb56dbb31c4738a3918db81fd24da732ce3b4ae6
 Author: Avi Kivity <avi@...ranet.com>
 Date:   Sun Dec 2 10:50:06 2007 +0200

    KVM: Export include/linux/kvm.h only if $ARCH actually supports KVM

    Currently, make headers_check barfs due to <asm/kvm.h>, which <linux/kvm.h>
    includes, not existing.  Rather than add a zillion <asm/kvm.h>s, export kvm.h
    only if the arch actually supports it.


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