linux-kernel - Re: [GIT PULL -tip v3] fix 39 'make headers

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Message-ID: <3f9a31f40901232216r4656776mfac4388485180a60@mail.gmail.com>
Date:	Sat, 24 Jan 2009 11:46:22 +0530
From:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Sam Ravnborg <sam@...nborg.org>, Ingo Molnar <mingo@...e.hu>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL -tip v3] fix 39 'make headers_check' warnings

On Mon, Jan 19, 2009 at 5:23 PM, Avi Kivity <avi@...hat.com> wrote:
> Sam Ravnborg wrote:
>>>
>>> They are.  This bits advertise to userspace what features kvm supports,
>>> both compile- and run-time.
>>>
>>
>> This is wrong...
>> The headers does not change with the kernel configuration and advertising
>> the
>> kvm features via a .h file like this is simply plain broken.
>>
>
> Ok.  Don't know why I thought unifdef was supplied with the full
> configuration.
>
>> You cannot assume that the header files are generated with the exact same
>> config
>> as used by the running kernel.
>>
>
> This is just for arch specific defines.  I'll move these to asm/kvm.h.
>
>> And userspace has in no way access to the CONFIG_ namespace which is
>> purely kernel-internal.
>>
>> I cannot see how you have ever seen kcm advertise that for example
>> KVM_CAP_USER_NMI
>> equals to 22 because CONFIG_X86 is never (supposed to be) defined in
>> userspace -
>> except if you did so yourself by some means.
>>
>
> We did, we ship a hacked-up kvm.h (generated by unifdef) with our userspace.
>

latest -tip is still giving 'make headers_check' warnings:
 usr/include/linux/kvm.h:61: leaks CONFIG_X86 to userspace where it is not valid
 usr/include/linux/kvm.h:64: leaks CONFIG_X86 to userspace where it is not valid
 usr/include/linux/kvm.h:387: leaks CONFIG_X86 to userspace where it
is not valid
 usr/include/linux/kvm.h:391: leaks CONFIG_X86 to userspace where it
is not valid
 usr/include/linux/kvm.h:396: leaks CONFIG_X86 to userspace where it
is not valid

So should I resend my patch or you are going to move this stuff

--
JSR
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