linux-kernel - [ls-zhu:shared_irq_v4 3/3] drivers/vdpa/ifcvf/ifcvf_main.c:94:13: warning: variable 'max

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Message-ID: <202202162105.kmic72fi-lkp@intel.com>
Date:   Wed, 16 Feb 2022 21:37:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [ls-zhu:shared_irq_v4 3/3] drivers/vdpa/ifcvf/ifcvf_main.c:94:13:
 warning: variable 'max_intr' set but not used

tree:   https://github.com/ls-zhu/linux shared_irq_v4
head:   25e932e005734a4b8924e41bbedafa9dd394aead
commit: 25e932e005734a4b8924e41bbedafa9dd394aead [3/3] vDPA/ifcvf: implement device MSIX vector allocator
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20220216/202202162105.kmic72fi-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ls-zhu/linux/commit/25e932e005734a4b8924e41bbedafa9dd394aead
        git remote add ls-zhu https://github.com/ls-zhu/linux
        git fetch --no-tags ls-zhu shared_irq_v4
        git checkout 25e932e005734a4b8924e41bbedafa9dd394aead
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/vdpa/ifcvf/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/vdpa/ifcvf/ifcvf_main.c: In function 'ifcvf_request_irq':
>> drivers/vdpa/ifcvf/ifcvf_main.c:94:13: warning: variable 'max_intr' set but not used [-Wunused-but-set-variable]
      94 |         u16 max_intr;
         |             ^~~~~~~~


vim +/max_intr +94 drivers/vdpa/ifcvf/ifcvf_main.c

    88	
    89	static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
    90	{
    91		struct pci_dev *pdev = adapter->pdev;
    92		struct ifcvf_hw *vf = &adapter->vf;
    93		int vector, nvectors, i, ret, irq;
  > 94		u16 max_intr;
    95	
    96		nvectors = ifcvf_alloc_vectors(adapter);
    97		if (nvectors <=0)
    98			return nvectors;
    99	
   100		max_intr = vf->nr_vring + 1;
   101		snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
   102			 pci_name(pdev));
   103		vector = 0;
   104		vf->config_irq = pci_irq_vector(pdev, vector);
   105		ret = devm_request_irq(&pdev->dev, vf->config_irq,
   106				       ifcvf_config_changed, 0,
   107				       vf->config_msix_name, vf);
   108		if (ret) {
   109			IFCVF_ERR(pdev, "Failed to request config irq\n");
   110			return ret;
   111		}
   112	
   113		for (i = 0; i < vf->nr_vring; i++) {
   114			snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
   115				 pci_name(pdev), i);
   116			vector = i + IFCVF_MSI_QUEUE_OFF;
   117			irq = pci_irq_vector(pdev, vector);
   118			ret = devm_request_irq(&pdev->dev, irq,
   119					       ifcvf_intr_handler, 0,
   120					       vf->vring[i].msix_name,
   121					       &vf->vring[i]);
   122			if (ret) {
   123				IFCVF_ERR(pdev,
   124					  "Failed to request irq for vq %d\n", i);
   125				ifcvf_free_irq(adapter, i);
   126	
   127				return ret;
   128			}
   129	
   130			vf->vring[i].irq = irq;
   131		}
   132	
   133		return 0;
   134	}
   135	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org