linux-kernel - arch/loongarch/kernel/machine_kexec.c:69:43: sparse: sparse: incorrect type in argument 2 (different address spaces)

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Message-ID: <202210180653.0CHpRaQv-lkp@intel.com>
Date:   Tue, 18 Oct 2022 06:24:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Youling Tang <tangyouling@...ngson.cn>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Huacai Chen <chenhuacai@...nel.org>
Subject: arch/loongarch/kernel/machine_kexec.c:69:43: sparse: sparse:
 incorrect type in argument 2 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   bbb8ceb5e2421184db9560e9d2cfaf858e1db616
commit: 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 LoongArch: Add kexec support
date:   6 days ago
config: loongarch-randconfig-s031-20221017
compiler: loongarch64-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=4a03b2ac06a5bcae29371866d9d11f5bfd4c9188
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188
        # 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=loongarch 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/loongarch/kernel/machine_kexec.c:69:43: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected char const * @@     got char [noderef] __user * @@
   arch/loongarch/kernel/machine_kexec.c:69:43: sparse:     expected char const *
   arch/loongarch/kernel/machine_kexec.c:69:43: sparse:     got char [noderef] __user *

vim +69 arch/loongarch/kernel/machine_kexec.c

    55	
    56	int machine_kexec_prepare(struct kimage *kimage)
    57	{
    58		int i;
    59		char *bootloader = "kexec";
    60		void *cmdline_ptr = (void *)KEXEC_CMDLINE_ADDR;
    61	
    62		kexec_image_info(kimage);
    63	
    64		kimage->arch.efi_boot = fw_arg0;
    65		kimage->arch.systable_ptr = fw_arg2;
    66	
    67		/* Find the command line */
    68		for (i = 0; i < kimage->nr_segments; i++) {
  > 69			if (!strncmp(bootloader, (char __user *)kimage->segment[i].buf, strlen(bootloader))) {
    70				if (!copy_from_user(cmdline_ptr, kimage->segment[i].buf, COMMAND_LINE_SIZE))
    71					kimage->arch.cmdline_ptr = (unsigned long)cmdline_ptr;
    72				break;
    73			}
    74		}
    75	
    76		if (!kimage->arch.cmdline_ptr) {
    77			pr_err("Command line not included in the provided image\n");
    78			return -EINVAL;
    79		}
    80	
    81		/* kexec need a safe page to save reboot_code_buffer */
    82		kimage->control_code_page = virt_to_page((void *)KEXEC_CONTROL_CODE);
    83	
    84		reboot_code_buffer = (unsigned long)page_address(kimage->control_code_page);
    85		memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size);
    86	

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

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