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

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Date:	Mon, 19 Jan 2009 11:19:50 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL -tip v3] fix 39 'make headers_check' warnings

Ingo Molnar wrote:
> (Avi Cc:-ed)
>
> * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
>
>   
>>       headers_check fix: linux/kvm.h
>>     
>
>   
>> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
>> index 5715f19..5d004bc 100644
>> --- a/include/linux/kvm.h
>> +++ b/include/linux/kvm.h
>> @@ -58,12 +58,14 @@ struct kvm_irqchip {
>>  	__u32 pad;
>>          union {
>>  		char dummy[512];  /* reserving space */
>> +#ifdef __KERNEL__
>>  #ifdef CONFIG_X86
>>  		struct kvm_pic_state pic;
>>  #endif
>>  #if defined(CONFIG_X86) || defined(CONFIG_IA64)
>>  		struct kvm_ioapic_state ioapic;
>>  #endif
>> +#endif /* __KERNEL__ */
>>  	} chip;
>>  };
>>     
>
> Avi, does user-space need the kvm_irqchip definition from this header? If 
> not then it would be cleaner to mark this whole structure as #ifdef 
> __KERNEL__.
>
>   

It does.  This patch will break userspace.

Doesn't 'make headers_install' unifder the CONFIG_ stuff?

>> @@ -384,18 +386,24 @@ struct kvm_trace_rec {
>>  #define KVM_CAP_MP_STATE 14
>>  #define KVM_CAP_COALESCED_MMIO 15
>>  #define KVM_CAP_SYNC_MMU 16  /* Changes to host mmap are reflected in guest */
>> +#ifdef __KERNEL__
>>  #if defined(CONFIG_X86)||defined(CONFIG_IA64)
>>  #define KVM_CAP_DEVICE_ASSIGNMENT 17
>>  #endif
>> +#endif /* __KERNEL__ */
>>  #define KVM_CAP_IOMMU 18
>> +#ifdef __KERNEL__
>>  #if defined(CONFIG_X86)
>>  #define KVM_CAP_DEVICE_MSI 20
>>  #endif
>> +#endif /* __KERNEL__ */
>>  /* Bug in KVM_SET_USER_MEMORY_REGION fixed: */
>>  #define KVM_CAP_DESTROY_MEMORY_REGION_WORKS 21
>> +#ifdef __KERNEL__
>>  #if defined(CONFIG_X86)
>>  #define KVM_CAP_USER_NMI 22
>>  #endif
>> +#endif /* __KERNEL__ */
>>     
>
> likewise, are these bits really used by user-space KVM bits? If not then 
> the whole thing could go into an #ifdef __KERNEL__ block.
>   

They are.  This bits advertise to userspace what features kvm supports, 
both compile- and run-time.

-- 
error compiling committee.c: too many arguments to function

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