linux-kernel - arch/mips/boot/compressed/decompress.c:114:57: sparse: sparse: Using plain integer as NULL pointer

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Date:   Mon, 18 Jul 2022 00:13:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     YunQiang Su <yunqiang.su@...united.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: arch/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@...el.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@...nel.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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