Hi Damien, kernel test robot noticed the following build warnings: [auto build test WARNING on pci/next] [also build test WARNING on pci/for-linus mani-mhi/mhi-next linus/master v6.12-rc2 next-20241004] [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/Damien-Le-Moal/PCI-endpoint-Introduce-pci_epc_function_is_valid/20241004-130947 base: https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next patch link: https://lore.kernel.org/r/20241004050742.140664-5-dlemoal%40kernel.org patch subject: [PATCH v3 4/7] PCI: endpoint: Introduce pci_epc_mem_map()/unmap() config: x86_64-randconfig-122-20241007 (https://download.01.org/0day-ci/archive/20241007/202410070929.jEKAJxjG-lkp@xxxxxxxxx/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241007/202410070929.jEKAJxjG-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410070929.jEKAJxjG-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> drivers/pci/endpoint/pci-epc-core.c:569:34: sparse: sparse: Using plain integer as NULL pointer drivers/pci/endpoint/pci-epc-core.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...): include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true vim +569 drivers/pci/endpoint/pci-epc-core.c 524 525 /** 526 * pci_epc_mem_map() - allocate and map a PCI address to a CPU address 527 * @epc: the EPC device on which the CPU address is to be allocated and mapped 528 * @func_no: the physical endpoint function number in the EPC device 529 * @vfunc_no: the virtual endpoint function number in the physical function 530 * @pci_addr: PCI address to which the CPU address should be mapped 531 * @pci_size: the number of bytes to map starting from @pci_addr 532 * @map: where to return the mapping information 533 * 534 * Allocate a controller memory address region and map it to a RC PCI address 535 * region, taking into account the controller physical address mapping 536 * constraints using pci_epc_map_align(). 537 * The effective size of the PCI address range mapped from @pci_addr is 538 * indicated by @map->pci_size. This size may be less than the requested 539 * @pci_size. The local virtual CPU address for the mapping is indicated by 540 * @map->virt_addr (@map->phys_addr indicates the physical address). 541 * The size and CPU address of the controller memory allocated and mapped are 542 * respectively indicated by @map->map_size and @map->virt_base (and 543 * @map->phys_base). 544 * 545 * Returns 0 on success and a negative error code in case of error. 546 */ 547 int pci_epc_mem_map(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 548 u64 pci_addr, size_t pci_size, struct pci_epc_map *map) 549 { 550 int ret; 551 552 ret = pci_epc_map_align(epc, func_no, vfunc_no, pci_addr, pci_size, map); 553 if (ret) 554 return ret; 555 556 map->virt_base = pci_epc_mem_alloc_addr(epc, &map->phys_base, 557 map->map_size); 558 if (!map->virt_base) 559 return -ENOMEM; 560 561 map->phys_addr = map->phys_base + map->map_ofst; 562 map->virt_addr = map->virt_base + map->map_ofst; 563 564 ret = pci_epc_map_addr(epc, func_no, vfunc_no, map->phys_base, 565 map->map_pci_addr, map->map_size); 566 if (ret) { 567 pci_epc_mem_free_addr(epc, map->phys_base, map->virt_base, 568 map->map_size); > 569 map->virt_base = 0; 570 return ret; 571 } 572 573 return 0; 574 } 575 EXPORT_SYMBOL_GPL(pci_epc_mem_map); 576 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
