linux-kernel - Re: [PATCH V2 1/3] x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available

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Date:   Mon, 4 Feb 2019 14:55:56 +0800
From:   kbuild test robot <lkp@...el.com>
To:     lantianyu1986@...il.com
Cc:     kbuild-all@...org, Lan Tianyu <Tianyu.Lan@...rosoft.com>,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org, joro@...tes.org,
        mchehab+samsung@...nel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        nicolas.ferre@...rochip.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        iommu@...ts.linux-foundation.org, michael.h.kelley@...rosoft.com,
        vkuznets@...hat.com, alex.williamson@...hat.com,
        dan.carpenter@...cle.com
Subject: Re: [PATCH V2 1/3] x86/Hyper-V: Set x2apic destination mode to
 physical when x2apic is available

Hi Lan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iommu/next]
[also build test ERROR on v5.0-rc4 next-20190204]
[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/lantianyu1986-gmail-com/x86-Hyper-V-IOMMU-Add-Hyper-V-IOMMU-driver-to-support-x2apic-mode/20190204-132009
base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: i386-randconfig-a3-02040849 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/mshyperv.c: In function 'ms_hyperv_init_platform':
>> arch/x86/kernel/cpu/mshyperv.c:339:3: error: 'x2apic_phys' undeclared (first use in this function)
      x2apic_phys = 1;
      ^
   arch/x86/kernel/cpu/mshyperv.c:339:3: note: each undeclared identifier is reported only once for each function it appears in

vim +/x2apic_phys +339 arch/x86/kernel/cpu/mshyperv.c

   331	
   332	/*
   333	 * Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic,
   334	 * set x2apic destination mode to physcial mode when x2apic is available
   335	 * and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs
   336	 * have 8-bit APIC id.
   337	 */
   338		if (IS_ENABLED(CONFIG_HYPERV_IOMMU) && x2apic_supported())
 > 339			x2apic_phys = 1;
   340	

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