linux-kernel - arch/mips/loongson64/reset.c:85:43: sparse: sparse: cast removes address space '_

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Message-ID: <202105271739.sI1tGKqH-lkp@intel.com>
Date:   Thu, 27 May 2021 17:04:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Huacai Chen <chenhc@...ote.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jinyang He <hejinyang@...ngson.cn>,
        Youling Tang <tangyouling@...ngson.cn>
Subject: arch/mips/loongson64/reset.c:85:43: sparse: sparse: cast removes
 address space '__user' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d7c5303fbc8ac874ae3e597a5a0d3707dc0230b4
commit: 6ce48897ce476bed86fde28752c27596e8753277 MIPS: Loongson64: Add kexec/kdump support
date:   6 weeks ago
config: mips-randconfig-s032-20210527 (attached as .config)
compiler: mips64el-linux-gcc (GCC) 9.3.0
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: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6ce48897ce476bed86fde28752c27596e8753277
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6ce48897ce476bed86fde28752c27596e8753277
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=mips 

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 >>)
   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/loongson64/reset.c:85:43: sparse: sparse: cast removes address space '__user' of expression
>> arch/mips/loongson64/reset.c:93:54: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const *__from @@     got void [noderef] __user *buf @@
   arch/mips/loongson64/reset.c:93:54: sparse:     expected void const *__from
   arch/mips/loongson64/reset.c:93:54: sparse:     got void [noderef] __user *buf

vim +/__user +85 arch/mips/loongson64/reset.c

    69	
    70	static int loongson_kexec_prepare(struct kimage *image)
    71	{
    72		int i, argc = 0;
    73		unsigned int *argv;
    74		char *str, *ptr, *bootloader = "kexec";
    75	
    76		/* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
    77		if (image->type == KEXEC_TYPE_DEFAULT)
    78			argv = (unsigned int *)kexec_argv;
    79		else
    80			argv = (unsigned int *)kdump_argv;
    81	
    82		argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
    83	
    84		for (i = 0; i < image->nr_segments; i++) {
  > 85			if (!strncmp(bootloader, (char *)image->segment[i].buf,
    86					strlen(bootloader))) {
    87				/*
    88				 * convert command line string to array
    89				 * of parameters (as bootloader does).
    90				 */
    91				int offt;
    92				str = (char *)argv + KEXEC_ARGV_SIZE/2;
  > 93				memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
    94				ptr = strchr(str, ' ');
    95	
    96				while (ptr && (argc < MAX_ARGS)) {
    97					*ptr = '\0';
    98					if (ptr[1] != ' ') {
    99						offt = (int)(ptr - str + 1);
   100						argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
   101						argc++;
   102					}
   103					ptr = strchr(ptr + 1, ' ');
   104				}
   105				break;
   106			}
   107		}
   108	
   109		if (image->type == KEXEC_TYPE_DEFAULT)
   110			kexec_argc = argc;
   111		else
   112			kdump_argc = argc;
   113	
   114		/* kexec/kdump need a safe page to save reboot_code_buffer */
   115		image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
   116	
   117		return 0;
   118	}
   119	

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

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