[kbuild-all] drivers/pci/pci.c:3911 pci_pio_to_address() warn: always true condition '(pio >= (0 - 0)) => (0-u64max >= 0)'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fc80c51fd4b23ec007e88d4c688f2cac1b8648e7 commit: b8104fda1fff0882e43b7e98832a76d7e98eb3e9 logic_pio: Define PIO_INDIRECT_SIZE for !CONFIG_INDIRECT_PIO date: 9 months ago config: s390-randconfig-m031-20200810 (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; New smatch warnings: drivers/pci/pci.c:3911 pci_pio_to_address() warn: always true condition '(pio >= (0 - 0)) => (0-u64max >= 0)' Old smatch warnings: drivers/pci/pci.c:5982 pci_specified_resource_alignment() warn: should '1 << align_order' be a 64 bit type? vim +3911 drivers/pci/pci.c c5076cfe768998 Tomasz Nowicki 2016-05-11 3905 c5076cfe768998 Tomasz Nowicki 2016-05-11 3906 phys_addr_t pci_pio_to_address(unsigned long pio) c5076cfe768998 Tomasz Nowicki 2016-05-11 3907 { c5076cfe768998 Tomasz Nowicki 2016-05-11 3908 phys_addr_t address = (phys_addr_t)OF_BAD_ADDR; c5076cfe768998 Tomasz Nowicki 2016-05-11 3909 c5076cfe768998 Tomasz Nowicki 2016-05-11 3910 #ifdef PCI_IOBASE 5745392e0c2b78 Zhichang Yuan 2018-03-15 @3911 if (pio >= MMIO_UPPER_LIMIT) c5076cfe768998 Tomasz Nowicki 2016-05-11 3912 return address; c5076cfe768998 Tomasz Nowicki 2016-05-11 3913 5745392e0c2b78 Zhichang Yuan 2018-03-15 3914 address = logic_pio_to_hwaddr(pio); c5076cfe768998 Tomasz Nowicki 2016-05-11 3915 #endif c5076cfe768998 Tomasz Nowicki 2016-05-11 3916 c5076cfe768998 Tomasz Nowicki 2016-05-11 3917 return address; c5076cfe768998 Tomasz Nowicki 2016-05-11 3918 } c5076cfe768998 Tomasz Nowicki 2016-05-11 3919 :::::: The code at line 3911 was first introduced by commit :::::: 5745392e0c2b78e0d73203281d5c42cbd6993194 PCI: Apply the new generic I/O management on PCI IO hosts :::::: TO: Zhichang Yuan <yuanzhichang(a)hisilicon.com&gt; :::::: CC: Bjorn Helgaas <helgaas(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org