linux-kernel - arch/parisc/math-emu/driver.c:88:17: sparse: sparse: Using plain integer as NULL pointer

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Date:   Sun, 5 Dec 2021 19:52:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Chris Down <chris@...isdown.name>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Petr Mladek <pmladek@...e.com>
Subject: arch/parisc/math-emu/driver.c:88:17: sparse: sparse: Using plain
 integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   79a72162048e42a677bc7336a9f5d86fc3ff9558
commit: 337015573718b161891a3473d25f59273f2e626b printk: Userspace format indexing support
date:   5 months ago
config: parisc-allyesconfig (https://download.01.org/0day-ci/archive/20211205/202112051946.nbvqPk1h-lkp@intel.com/config)
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/?id=337015573718b161891a3473d25f59273f2e626b
        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@...el.com>


sparse warnings: (new ones prefixed by >>)
>> arch/parisc/math-emu/driver.c:88:17: sparse: sparse: Using plain integer as NULL pointer
>> arch/parisc/math-emu/driver.c:88:17: sparse: sparse: Using plain integer as NULL pointer
>> arch/parisc/math-emu/driver.c:88:17: 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: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@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org