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Date:   Sat, 20 Jan 2018 08:48:07 +0100 (CET)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Vitaly Kuznetsov <vkuznets@redhat.com>
cc:     kbuild test robot <lkp@intel.com>, kbuild-all@01.org,
        kvm@vger.kernel.org, x86@kernel.org,
        Stephen Hemminger <sthemmin@microsoft.com>,
        =?ISO-8859-2?Q?Radim_Kr=E8m=E1=F8?= <rkrcmar@redhat.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        Ingo Molnar <mingo@redhat.com>,
        Roman Kagan <rkagan@virtuozzo.com>,
        Andy Lutomirski <luto@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Mohammed Gamal <mmorsy@redhat.com>
Subject: Re: [PATCH v3 3/7] x86/hyper-v: reenlightenment notifications
 support
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References: <20180116182700.1042-4-vkuznets@redhat.com> <201801191841.QZ26OYif%fengguang.wu@intel.com> <87o9lqdt15.fsf@vitty.brq.redhat.com>
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On Fri, 19 Jan 2018, Vitaly Kuznetsov wrote:
> kbuild test robot <lkp@intel.com> writes:
> 
> > Hi Vitaly,
> >
> > Thank you for the patch! Perhaps something to improve:
> >
> > [auto build test WARNING on tip/auto-latest]
> > [also build test WARNING on v4.15-rc8 next-20180118]
> > [cannot apply to tip/x86/core kvm/linux-next]
> > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> >
> > url:    https://github.com/0day-ci/linux/commits/Vitaly-Kuznetsov/x86-kvm-hyperv-stable-clocksorce-for-L2-guests-when-running-nested-KVM-on-Hyper-V/20180119-160814
> > config: x86_64-allmodconfig (attached as .config)
> > compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
> > reproduce:
> >         # save the attached .config to linux build tree
> >         make ARCH=x86_64 
> >
> > All warnings (new ones prefixed by >>):
> >
> >    In file included from include/linux/kasan.h:17:0,
> >                     from include/linux/slab.h:129,
> >                     from include/linux/irq.h:26,
> >                     from arch/x86/include/asm/hardirq.h:6,
> >                     from include/linux/hardirq.h:9,
> >                     from include/linux/interrupt.h:13,
> >                     from arch/x86/include/asm/mshyperv.h:8,
> >                     from arch/x86//entry/vdso/vdso32/../vclock_gettime.c:20,
> >                     from arch/x86//entry/vdso/vdso32/vclock_gettime.c:33:
> >    arch/x86/include/asm/pgtable.h: In function 'clone_pgd_range':
> >    arch/x86/include/asm/pgtable.h:1129:9: error: implicit declaration of function 'kernel_to_user_pgdp'; did you mean 'u64_to_user_ptr'? [-Werror=implicit-function-declaration]
> >      memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
> >             ^~~~~~~~~~~~~~~~~~~
> 
> Sorry but I'm failing to see how this (and all the rest) is related to
> my patch ...

You added '#include <linux/interrupt.h>' to mshyperv.h which is included in
vclock_gettime.c and pulls in other stuff which fails to expand....

Thanks,

	tglx