arch/mips/boot/compressed/decompress.c:110:57: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5859a2b1991101d6b978f3feb5325dad39421f29
commit: baec970aa5ba11099ad7a91773350c91fb2113f0 mips: Add N64 machine type
date:   1 year, 1 month ago
config: mips-randconfig-s032-20220303 (https://download.01.org/0day-ci/archive/20220304/202203040006.YLgfJuuJ-lkp@xxxxxxxxx/config)
compiler: mips64-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=baec970aa5ba11099ad7a91773350c91fb2113f0
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout baec970aa5ba11099ad7a91773350c91fb2113f0
        # 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=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)
   command-line: note: in included file:
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQUIRE redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_SEQ_CST redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQ_REL redefined
   builtin:0:0: sparse: this was the original definition
   builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_RELEASE redefined
   builtin:0:0: sparse: this was the original definition
>> arch/mips/boot/compressed/decompress.c:110:57: sparse: sparse: Using plain integer as NULL pointer
   arch/mips/boot/compressed/decompress.c:110:60: sparse: sparse: Using plain integer as NULL pointer
   arch/mips/boot/compressed/decompress.c:111:57: sparse: sparse: Using plain integer as NULL pointer

vim +110 arch/mips/boot/compressed/decompress.c

3b628cac65fa57f Ben Chan    2014-06-24   85  
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   86  void decompress_kernel(unsigned long boot_heap_start)
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   87  {
1e1a77d6984a001 Wu Zhangjin 2010-06-16   88  	unsigned long zimage_start, zimage_size;
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   89  
1e1a77d6984a001 Wu Zhangjin 2010-06-16   90  	zimage_start = (unsigned long)(&__image_begin);
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   91  	zimage_size = (unsigned long)(&__image_end) -
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   92  	    (unsigned long)(&__image_begin);
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   93  
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   94  	puts("zimage at:     ");
1e1a77d6984a001 Wu Zhangjin 2010-06-16   95  	puthex(zimage_start);
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   96  	puts(" ");
1e1a77d6984a001 Wu Zhangjin 2010-06-16   97  	puthex(zimage_size + zimage_start);
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   98  	puts("\n");
1b93b3c3e94be26 Wu Zhangjin 2009-10-14   99  
1e1a77d6984a001 Wu Zhangjin 2010-06-16  100  	/* This area are prepared for mallocing when decompressing */
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  101  	free_mem_ptr = boot_heap_start;
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  102  	free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  103  
1e1a77d6984a001 Wu Zhangjin 2010-06-16  104  	/* Display standard Linux/MIPS boot prompt */
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  105  	puts("Uncompressing Linux at load address ");
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  106  	puthex(VMLINUX_LOAD_ADDRESS_ULL);
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  107  	puts("\n");
1e1a77d6984a001 Wu Zhangjin 2010-06-16  108  
1b93b3c3e94be26 Wu Zhangjin 2009-10-14  109  	/* Decompress the kernel with according algorithm */
2d3862d26e67a59 Yinghai Lu  2015-09-09 @110  	__decompress((char *)zimage_start, zimage_size, 0, 0,

:::::: The code at line 110 was first introduced by commit
:::::: 2d3862d26e67a59340ba1cf1748196c76c5787de lib/decompressors: use real out buf size for gunzip with kernel

:::::: TO: Yinghai Lu <yinghai@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
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