Hi Christoph, First bad commit (maybe != root cause): tree: git://git.infradead.org/users/hch/misc.git mips-ioremap-cleanups head: a6fb959148f8c6dfe0fe43b54473d33246659232 commit: be647238995e1d96d6744d18d1fff974691b6d0c [6/7] MIPS: move ioremap_prot und iounmap out of line config: mips-gpr_defconfig (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout be647238995e1d96d6744d18d1fff974691b6d0c # save the attached .config to linux build tree GCC_VERSION=9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/mips/alchemy/common/setup.c: In function 'io_remap_pfn_range': 99 | return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot); | ^~~~~~~~~~~~~~~ | io_remap_pfn_range cc1: all warnings being treated as errors vim +99 arch/mips/alchemy/common/setup.c 1864554a205d5d Christoph Hellwig 2020-03-23 93 1864554a205d5d Christoph Hellwig 2020-03-23 94 int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr, 1864554a205d5d Christoph Hellwig 2020-03-23 95 unsigned long pfn, unsigned long size, pgprot_t prot) 1864554a205d5d Christoph Hellwig 2020-03-23 96 { 1864554a205d5d Christoph Hellwig 2020-03-23 97 phys_addr_t phys_addr = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 1864554a205d5d Christoph Hellwig 2020-03-23 98 1864554a205d5d Christoph Hellwig 2020-03-23 @99 return remap_pfn_range(vma, vaddr, phys_addr >> PAGE_SHIFT, size, prot); :::::: The code at line 99 was first introduced by commit :::::: 1864554a205d5dc59bb669689006db69f8ca0b48 MIPS: cleanup fixup_bigphys_addr handling :::::: TO: Christoph Hellwig <hch(a)lst.de&gt; :::::: CC: Christoph Hellwig <hch(a)lst.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org