linux-kernel - arch/loongarch/kernel/stacktrace.c:47:25: sparse: sparse: incorrect type in assignment (different address spaces)

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Date:   Sat, 1 Jul 2023 18:58:26 +0800
From:   kernel test robot <lkp@...el.com>
To:     Qing Zhang <zhangqing@...ngson.cn>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Huacai Chen <chenhuacai@...nel.org>
Subject: arch/loongarch/kernel/stacktrace.c:47:25: sparse: sparse: incorrect
 type in assignment (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a507db1d8fdc39802415e4d2ef6d1aecd67927fa
commit: 4d7bf939df08218e682f7a42952eee3bad4dceb7 LoongArch: Add USER_STACKTRACE support
date:   11 months ago
config: loongarch-randconfig-r073-20230627 (https://download.01.org/0day-ci/archive/20230701/202307011821.uIMwFiL1-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230701/202307011821.uIMwFiL1-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/202307011821.uIMwFiL1-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/loongarch/kernel/stacktrace.c:47:25: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned long [noderef] __user *user_frame_tail @@     got unsigned long * @@
   arch/loongarch/kernel/stacktrace.c:47:25: sparse:     expected unsigned long [noderef] __user *user_frame_tail
   arch/loongarch/kernel/stacktrace.c:47:25: sparse:     got unsigned long *

vim +47 arch/loongarch/kernel/stacktrace.c

    39	
    40	static int
    41	copy_stack_frame(unsigned long fp, struct stack_frame *frame)
    42	{
    43		int ret = 1;
    44		unsigned long err;
    45		unsigned long __user *user_frame_tail;
    46	
  > 47		user_frame_tail = (unsigned long *)(fp - sizeof(struct stack_frame));
    48		if (!access_ok(user_frame_tail, sizeof(*frame)))
    49			return 0;
    50	
    51		pagefault_disable();
    52		err = (__copy_from_user_inatomic(frame, user_frame_tail, sizeof(*frame)));
    53		if (err || (unsigned long)user_frame_tail >= frame->fp)
    54			ret = 0;
    55		pagefault_enable();
    56	
    57		return ret;
    58	}
    59	

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