linux-kernel - arch/loongarch/kernel/kexec_efi.c:64:22: sparse: sparse: cast to restricted _

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Message-ID: <202512141450.vbW57SvC-lkp@intel.com>
Date: Sun, 14 Dec 2025 14:30:07 +0800
From: kernel test robot <lkp@...el.com>
To: Youling Tang <tangyouling@...inos.cn>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...nel.org>
Subject: arch/loongarch/kernel/kexec_efi.c:64:22: sparse: sparse: cast to
 restricted __le64

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
commit: 55d990f0084c2b8ab9321dc59fc11dce855b4d61 LoongArch: Add EFI binary support for kexec_file
date:   2 months ago
config: loongarch-randconfig-r134-20251214 (https://download.01.org/0day-ci/archive/20251214/202512141450.vbW57SvC-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512141450.vbW57SvC-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512141450.vbW57SvC-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/loongarch/kernel/kexec_efi.c:64:22: sparse: sparse: cast to restricted __le64
   arch/loongarch/kernel/kexec_efi.c:65:23: sparse: sparse: cast to restricted __le64

vim +64 arch/loongarch/kernel/kexec_efi.c

    37	
    38	static void *efi_kexec_load(struct kimage *image,
    39					char *kernel, unsigned long kernel_len,
    40					char *initrd, unsigned long initrd_len,
    41					char *cmdline, unsigned long cmdline_len)
    42	{
    43		int ret;
    44		unsigned long text_offset, kernel_segment_number;
    45		struct kexec_buf kbuf;
    46		struct kexec_segment *kernel_segment;
    47		struct loongarch_image_header *h;
    48	
    49		h = (struct loongarch_image_header *)kernel;
    50		if (!h->kernel_asize)
    51			return ERR_PTR(-EINVAL);
    52	
    53		/*
    54		 * Load the kernel
    55		 * FIXME: Non-relocatable kernel rejected for kexec_file (require CONFIG_RELOCATABLE)
    56		 */
    57		kbuf.image = image;
    58		kbuf.buf_max = ULONG_MAX;
    59		kbuf.top_down = false;
    60	
    61		kbuf.buffer = kernel;
    62		kbuf.bufsz = kernel_len;
    63		kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
  > 64		kbuf.memsz = le64_to_cpu(h->kernel_asize);
    65		text_offset = le64_to_cpu(h->text_offset);
    66		kbuf.buf_min = text_offset;
    67		kbuf.buf_align = SZ_2M;
    68	
    69		kernel_segment_number = image->nr_segments;
    70	
    71		/*
    72		 * The location of the kernel segment may make it impossible to
    73		 * satisfy the other segment requirements, so we try repeatedly
    74		 * to find a location that will work.
    75		 */
    76		while ((ret = kexec_add_buffer(&kbuf)) == 0) {
    77			/* Try to load additional data */
    78			kernel_segment = &image->segment[kernel_segment_number];
    79			ret = load_other_segments(image, kernel_segment->mem,
    80						  kernel_segment->memsz, initrd,
    81						  initrd_len, cmdline, cmdline_len);
    82			if (!ret)
    83				break;
    84	
    85			/*
    86			 * We couldn't find space for the other segments; erase the
    87			 * kernel segment and try the next available hole.
    88			 */
    89			image->nr_segments -= 1;
    90			kbuf.buf_min = kernel_segment->mem + kernel_segment->memsz;
    91			kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
    92		}
    93	
    94		if (ret < 0) {
    95			pr_err("Could not find any suitable kernel location!");
    96			return ERR_PTR(ret);
    97		}
    98	
    99		kernel_segment = &image->segment[kernel_segment_number];
   100	
   101		/* Make sure the second kernel jumps to the correct "kernel_entry" */
   102		image->start = kernel_segment->mem + h->kernel_entry - text_offset;
   103	
   104		kexec_dprintk("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
   105			      kernel_segment->mem, kbuf.bufsz, kernel_segment->memsz);
   106	
   107		return NULL;
   108	}
   109	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki