linux-kernel - Re: [PATCH v0 15/15] mshv: Populate mmio mappings for PCI passthru

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Message-ID: <202601210255.2ZZOLtMV-lkp@intel.com>
Date: Wed, 21 Jan 2026 03:52:58 +0800
From: kernel test robot <lkp@...el.com>
To: Mukesh R <mrathor@...ux.microsoft.com>, linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, linux-pci@...r.kernel.org,
	linux-arch@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, kys@...rosoft.com,
	haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
	longli@...rosoft.com, catalin.marinas@....com, will@...nel.org,
	tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, hpa@...or.com, joro@...tes.org,
	lpieralisi@...nel.org, kwilczynski@...nel.org, mani@...nel.org,
	robh@...nel.org, bhelgaas@...gle.com, arnd@...db.de,
	nunodasneves@...ux.microsoft.com, mhklinux@...look.com,
	romank@...ux.microsoft.com
Subject: Re: [PATCH v0 15/15] mshv: Populate mmio mappings for PCI passthru

Hi Mukesh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on pci/next pci/for-linus arm64/for-next/core soc/for-next linus/master v6.19-rc6]
[cannot apply to clk/clk-next arnd-asm-generic/master next-20260119]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Mukesh-R/iommu-hyperv-rename-hyperv-iommu-c-to-hyperv-irq-c/20260120-145832
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20260120064230.3602565-16-mrathor%40linux.microsoft.com
patch subject: [PATCH v0 15/15] mshv: Populate mmio mappings for PCI passthru
config: x86_64-randconfig-003-20260120 (https://download.01.org/0day-ci/archive/20260121/202601210255.2ZZOLtMV-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260121/202601210255.2ZZOLtMV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601210255.2ZZOLtMV-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hv/mshv_root_main.c:60:19: warning: 'setup_hv_full_mmio' defined but not used [-Wunused-function]
      60 | static int __init setup_hv_full_mmio(char *str)
         |                   ^~~~~~~~~~~~~~~~~~


vim +/setup_hv_full_mmio +60 drivers/hv/mshv_root_main.c

    58	
    59	bool hv_nofull_mmio;   /* don't map entire mmio region upon fault */
  > 60	static int __init setup_hv_full_mmio(char *str)
    61	{
    62		hv_nofull_mmio = true;
    63		return 0;
    64	}
    65	__setup("hv_nofull_mmio", setup_hv_full_mmio);
    66	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki