tree: https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git testing/pci_iounmap-fix head: 442fc3646b69a4da912452fd6b79a4615d47eb88 commit: 442fc3646b69a4da912452fd6b79a4615d47eb88 [1/1] asm-generic: Fix default pci_iounmap() generic implementation config: sparc64-randconfig-m031-20200911 (attached as .config) compiler: sparc64-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 git checkout 442fc3646b69a4da912452fd6b79a4615d47eb88 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from arch/sparc/include/asm/io_32.h:14, from arch/sparc/include/asm/io.h:7, from arch/sparc/vdso/vdso32/../vclock_gettime.c:18, from arch/sparc/vdso/vdso32/vclock_gettime.c:22: include/asm-generic/io.h: In function '__pci_ioport_unmap': include/asm-generic/io.h:1010:8: warning: ordered comparison of pointer with null pointer [-Wextra] 1010 | if (p >= PCI_IOBASE && p < PCI_IOBASE + IO_SPACE_LIMIT) | ^~ 1012 | iounmap(p); | ^~~~~~~ | vunmap In file included from arch/sparc/include/asm/io.h:7, from arch/sparc/vdso/vdso32/../vclock_gettime.c:18, from arch/sparc/vdso/vdso32/vclock_gettime.c:22: arch/sparc/include/asm/io_32.h: At top level: 131 | void iounmap(volatile void __iomem *addr); | ^~~~~~~ In file included from arch/sparc/include/asm/io_32.h:14, from arch/sparc/include/asm/io.h:7, from arch/sparc/vdso/vdso32/../vclock_gettime.c:18, from arch/sparc/vdso/vdso32/vclock_gettime.c:22: include/asm-generic/io.h:1012:2: note: previous implicit declaration of 'iounmap' was here 1012 | iounmap(p); | ^~~~~~~ In file included from arch/sparc/vdso/vdso32/vclock_gettime.c:22: arch/sparc/vdso/vdso32/../vclock_gettime.c:254:1: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes] 254 | __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts) | ^~~~~~~~~~~~~~~~~~~~ arch/sparc/vdso/vdso32/../vclock_gettime.c:282:1: warning: no previous prototype for '__vdso_clock_gettime_stick' [-Wmissing-prototypes] 282 | __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ arch/sparc/vdso/vdso32/../vclock_gettime.c:307:1: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes] 307 | __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) | ^~~~~~~~~~~~~~~~~~~ arch/sparc/vdso/vdso32/../vclock_gettime.c:343:1: warning: no previous prototype for '__vdso_gettimeofday_stick' [-Wmissing-prototypes] 343 | __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz) | ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors # https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git/comm... git remote add lpieralisi https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git git fetch --no-tags lpieralisi testing/pci_iounmap-fix git checkout 442fc3646b69a4da912452fd6b79a4615d47eb88 vim +1012 include/asm-generic/io.h 997 998 #ifdef CONFIG_HAS_IOPORT_MAP 999 #ifndef CONFIG_GENERIC_IOMAP 1000 #ifndef ioport_map 1001 #define ioport_map ioport_map 1002 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) 1003 { 1004 port &= IO_SPACE_LIMIT; 1005 return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; 1006 } 1007 #define __pci_ioport_unmap __pci_ioport_unmap 1008 static inline void __pci_ioport_unmap(void __iomem *p) 1009 { 1010 if (p >= PCI_IOBASE && p < PCI_IOBASE + IO_SPACE_LIMIT) 1011 return; 1013 } 1014 #endif 1015 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org