[linux-next:master 8183/8750] drivers/iommu/intel/iommu.c:5643:27: warning: variable 'last_pfn' set but not used

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   6147c83fd749d19a0d3ccc2f64d12138ab010b47
commit: 2a2b8eaa5b25668a6f717f94b55f4e3aaf87629d [8183/8750] iommu: Handle freelists when using deferred flushing in iommu drivers
config: ia64-randconfig-r004-20201127 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=2a2b8eaa5b25668a6f717f94b55f4e3aaf87629d
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 2a2b8eaa5b25668a6f717f94b55f4e3aaf87629d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

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

All warnings (new ones prefixed by >>):

   drivers/iommu/intel/iommu.c: In function 'intel_iommu_tlb_sync':
>> drivers/iommu/intel/iommu.c:5643:27: warning: variable 'last_pfn' set but not used [-Wunused-but-set-variable]
    5643 |  unsigned long start_pfn, last_pfn;
         |                           ^~~~~~~~

vim +/last_pfn +5643 drivers/iommu/intel/iommu.c

  5636	
  5637	static void intel_iommu_tlb_sync(struct iommu_domain *domain,
  5638					 struct iommu_iotlb_gather *gather)
  5639	{
  5640		struct dmar_domain *dmar_domain = to_dmar_domain(domain);
  5641		unsigned long iova_pfn = IOVA_PFN(gather->start);
  5642		size_t size = gather->end - gather->start;
> 5643		unsigned long start_pfn, last_pfn;
  5644		unsigned long nrpages;
  5645		int iommu_id;
  5646	
  5647		nrpages = aligned_nrpages(gather->start, size);
  5648		start_pfn = mm_to_dma_pfn(iova_pfn);
  5649		last_pfn = start_pfn + nrpages - 1;
  5650	
  5651		for_each_domain_iommu(iommu_id, dmar_domain)
  5652			iommu_flush_iotlb_psi(g_iommus[iommu_id], dmar_domain,
  5653					      start_pfn, nrpages, !gather->freelist, 0);
  5654	
  5655		dma_free_pagelist(gather->freelist);
  5656	}
  5657	

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

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