tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: b81b1829e7e39f6cebdf6e4d5484eacbceda8554 commit: 337015573718b161891a3473d25f59273f2e626b printk: Userspace format indexing support date: 7 months ago config: parisc-randconfig-s031-20220213 (https://download.01.org/0day-ci/archive/20220213/202202130955.JyBizoU1-lk...) compiler: hppa-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 337015573718b161891a3473d25f59273f2e626b # 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=parisc SHELL=/bin/bash 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/parisc/math-emu/driver.c:90:17: sparse: sparse: Using plain integer as NULL pointer arch/parisc/math-emu/driver.c:90:17: sparse: sparse: Using plain integer as NULL pointer arch/parisc/math-emu/driver.c:90:17: sparse: sparse: Using plain integer as NULL pointer arch/parisc/math-emu/driver.c:93:22: sparse: sparse: undefined identifier 'decode_fpu' vim +88 arch/parisc/math-emu/driver.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 64 ^1da177e4c3f41 Linus Torvalds 2005-04-16 65 /* Handle a floating point exception. Return zero if the faulting ^1da177e4c3f41 Linus Torvalds 2005-04-16 66 instruction can be completed successfully. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 67 int ^1da177e4c3f41 Linus Torvalds 2005-04-16 68 handle_fpe(struct pt_regs *regs) ^1da177e4c3f41 Linus Torvalds 2005-04-16 69 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 70 extern void printbinary(unsigned long x, int nbits); ^1da177e4c3f41 Linus Torvalds 2005-04-16 71 unsigned int orig_sw, sw; ^1da177e4c3f41 Linus Torvalds 2005-04-16 72 int signalcode; ^1da177e4c3f41 Linus Torvalds 2005-04-16 73 /* need an intermediate copy of float regs because FPU emulation ^1da177e4c3f41 Linus Torvalds 2005-04-16 74 * code expects an artificial last entry which contains zero ^1da177e4c3f41 Linus Torvalds 2005-04-16 75 * ^1da177e4c3f41 Linus Torvalds 2005-04-16 76 * also, the passed in fr registers contain one word that defines ^1da177e4c3f41 Linus Torvalds 2005-04-16 77 * the fpu type. the fpu type information is constructed ^1da177e4c3f41 Linus Torvalds 2005-04-16 78 * inside the emulation code ^1da177e4c3f41 Linus Torvalds 2005-04-16 79 */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 80 __u64 frcopy[36]; ^1da177e4c3f41 Linus Torvalds 2005-04-16 81 ^1da177e4c3f41 Linus Torvalds 2005-04-16 82 memcpy(frcopy, regs->fr, sizeof regs->fr); ^1da177e4c3f41 Linus Torvalds 2005-04-16 83 frcopy[32] = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 84 ^1da177e4c3f41 Linus Torvalds 2005-04-16 85 memcpy(&orig_sw, frcopy, sizeof(orig_sw)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 86 ^1da177e4c3f41 Linus Torvalds 2005-04-16 87 if (FPUDEBUG) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 @88 printk(KERN_DEBUG "FP VZOUICxxxxCQCQCQCQCQCRMxxTDVZOUI ->\n "); :::::: The code at line 88 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org