Re: [PATCH 3/6] PCI: dwc: endpoint: Add support for BAR type BAR_RESIZABLE

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

Hi Niklas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on next-20250108]
[cannot apply to pci/for-linus linus/master v6.13-rc6]
[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/Niklas-Cassel/PCI-endpoint-Add-BAR-type-BAR_RESIZABLE/20250108-021844
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20250107181450.3182430-11-cassel%40kernel.org
patch subject: [PATCH 3/6] PCI: dwc: endpoint: Add support for BAR type BAR_RESIZABLE
config: arm-randconfig-003-20250109 (https://download.01.org/0day-ci/archive/20250109/202501090927.zMSzHORM-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 096551537b2a747a3387726ca618ceeb3950e9bc)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250109/202501090927.zMSzHORM-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501090927.zMSzHORM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/pci/controller/dwc/pcie-designware-ep.c:14:
   In file included from drivers/pci/controller/dwc/pcie-designware.h:17:
   In file included from include/linux/dma-mapping.h:8:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/pci/controller/dwc/pcie-designware-ep.c:259:27: warning: result of comparison of constant 140737488355328 with expression of type 'size_t' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
     259 |         if (size < SZ_1M || size > (SZ_128G * 1024))
         |                             ~~~~ ^ ~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +259 drivers/pci/controller/dwc/pcie-designware-ep.c

   249	
   250	static u32 dw_pcie_ep_bar_size_to_rebar_cap(size_t size)
   251	{
   252		u32 val;
   253	
   254		/*
   255		 * According to PCIe base spec, min size for a resizable BAR is 1 MB,
   256		 * thus disallow a requested BAR size smaller than 1 MB.
   257		 * Disallow a requested BAR size larger than 128 TB.
   258		 */
 > 259		if (size < SZ_1M || size > (SZ_128G * 1024))
   260			return 0;
   261	
   262		val = ilog2(size);
   263		val -= 20;
   264	
   265		/* Sizes in REBAR_CAP start at BIT(4). */
   266		return BIT(val + 4);
   267	}
   268	

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