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Subjectarch/mips/boot/compressed/decompress.c:114:57: sparse: sparse: Using plain integer as NULL pointer
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 2eccaca7b62b2836260c6fb22156a44e3d99a74a
commit: 31b2f3dc851c65fee288612432c4fc956f1a264e MIPS: enable both vmlinux.gz.itb and vmlinuz for generic
date: 7 months ago
config: mips-randconfig-s042-20220717 (https://download.01.org/0day-ci/archive/20220718/202207180026.akNaiHTy-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=31b2f3dc851c65fee288612432c4fc956f1a264e
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 31b2f3dc851c65fee288612432c4fc956f1a264e
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> arch/mips/boot/compressed/decompress.c:114:57: sparse: sparse: Using plain integer as NULL pointer
arch/mips/boot/compressed/decompress.c:114:60: sparse: sparse: Using plain integer as NULL pointer
arch/mips/boot/compressed/decompress.c:115:57: sparse: sparse: Using plain integer as NULL pointer

vim +114 arch/mips/boot/compressed/decompress.c

3b628cac65fa57 Ben Chan 2014-06-24 89
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 90 void decompress_kernel(unsigned long boot_heap_start)
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 91 {
1e1a77d6984a00 Wu Zhangjin 2010-06-16 92 unsigned long zimage_start, zimage_size;
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 93
1e1a77d6984a00 Wu Zhangjin 2010-06-16 94 zimage_start = (unsigned long)(&__image_begin);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 95 zimage_size = (unsigned long)(&__image_end) -
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 96 (unsigned long)(&__image_begin);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 97
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 98 puts("zimage at: ");
1e1a77d6984a00 Wu Zhangjin 2010-06-16 99 puthex(zimage_start);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 100 puts(" ");
1e1a77d6984a00 Wu Zhangjin 2010-06-16 101 puthex(zimage_size + zimage_start);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 102 puts("\n");
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 103
1e1a77d6984a00 Wu Zhangjin 2010-06-16 104 /* This area are prepared for mallocing when decompressing */
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 105 free_mem_ptr = boot_heap_start;
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 106 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 107
1e1a77d6984a00 Wu Zhangjin 2010-06-16 108 /* Display standard Linux/MIPS boot prompt */
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 109 puts("Uncompressing Linux at load address ");
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 110 puthex(VMLINUX_LOAD_ADDRESS_ULL);
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 111 puts("\n");
1e1a77d6984a00 Wu Zhangjin 2010-06-16 112
1b93b3c3e94be2 Wu Zhangjin 2009-10-14 113 /* Decompress the kernel with according algorithm */
2d3862d26e67a5 Yinghai Lu 2015-09-09 @114 __decompress((char *)zimage_start, zimage_size, 0, 0,

:::::: The code at line 114 was first introduced by commit
:::::: 2d3862d26e67a59340ba1cf1748196c76c5787de lib/decompressors: use real out buf size for gunzip with kernel

:::::: TO: Yinghai Lu <yinghai@kernel.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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