tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f71077a4d84bbe8c7b91b7db7c4ef815755ac5e3 commit: 12285ff8667bf06c168113c10d3619834e423ae6 sh: kdump: add some attribute to function date: 5 months ago config: sh-randconfig-s032-20220217 (https://download.01.org/0day-ci/archive/20220217/202202171614.EFFhggHO-lk...) compiler: sh4-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 12285ff8667bf06c168113c10d3619834e423ae6 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sh SHELL=/bin/bash arch/sh/kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) arch/sh/kernel/crash_dump.c:37:61: sparse: expected void const *from arch/sh/kernel/crash_dump.c:37:61: sparse: got void [noderef] __iomem * arch/sh/kernel/crash_dump.c:42:28: sparse: expected void const *__from arch/sh/kernel/crash_dump.c:42:28: sparse: got void [noderef] __iomem * vim +37 arch/sh/kernel/crash_dump.c 12 13 /** 14 * copy_oldmem_page - copy one page from "oldmem" 15 * @pfn: page frame number to be copied 16 * @buf: target memory address for the copy; this can be in kernel address 17 * space or user address space (see @userbuf) 18 * @csize: number of bytes to copy 19 * @offset: offset in bytes into the page (based on pfn) to begin the copy 20 * @userbuf: if set, @buf is in user address space, use copy_to_user(), 21 * otherwise @buf is in kernel address space, use memcpy(). 22 * 23 * Copy a page from "oldmem". For this page, there is no pte mapped 24 * in the current kernel. We stitch up a pte, similar to kmap_atomic. 25 */ 26 ssize_t copy_oldmem_page(unsigned long pfn, char *buf, 27 size_t csize, unsigned long offset, int userbuf) 28 { 29 void __iomem *vaddr; 30 31 if (!csize) 32 return 0; 33 34 vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); 35 36 if (userbuf) { 38 iounmap(vaddr); 39 return -EFAULT; 40 } 41 } else --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org