[scosu-sched:topic/mmap-cap-prot-wip/v6.18 462/1130] net/bpf/bpf_dummy_struct_ops.c:43:18: warning: cast to pointer from integer of different size

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/scosu/linux-sched topic/mmap-cap-prot-wip/v6.18
head:   f69a5a9d9fee15edde28429e23a4c749a59937bd
commit: e2a0a8156299c5b87411fce4727f2871edaccf23 [462/1130] [CHERRY-PICK] bpf: use user pointer types in uAPI structs
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20260521/202605211729.sQVBdZ76-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260521/202605211729.sQVBdZ76-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605211729.sQVBdZ76-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/bpfptr.h:6,
                    from include/linux/bpf.h:28,
                    from include/linux/bpf_verifier.h:7,
                    from net/bpf/bpf_dummy_struct_ops.c:6:
   include/linux/compat.h:1119:9: warning: 'is_compat32_task' redefined
    1119 | #define is_compat32_task() (0)
         |         ^~~~~~~~~~~~~~~~
   In file included from include/linux/compat.h:22:
   arch/mips/include/asm/compat.h:157:9: note: this is the location of the previous definition
     157 | #define is_compat32_task is_compat_task
         |         ^~~~~~~~~~~~~~~~
   net/bpf/bpf_dummy_struct_ops.c: In function 'dummy_ops_init_args':
>> net/bpf/bpf_dummy_struct_ops.c:43:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      43 |         ctx_in = (void __user *)kattr->test.ctx_in;
         |                  ^
   net/bpf/bpf_dummy_struct_ops.c:48:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      48 |         u_state = (void __user *)args->args[0];
         |                   ^
   net/bpf/bpf_dummy_struct_ops.c: In function 'dummy_ops_copy_args':
   net/bpf/bpf_dummy_struct_ops.c:63:19: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      63 |         u_state = (void __user *)args->args[0];
         |                   ^
--
   In file included from include/linux/bpfptr.h:6,
                    from include/linux/bpf.h:28,
                    from drivers/media/rc/bpf-lirc.c:6:
   include/linux/compat.h:1119:9: warning: 'is_compat32_task' redefined
    1119 | #define is_compat32_task() (0)
         |         ^~~~~~~~~~~~~~~~
   In file included from include/linux/compat.h:22:
   arch/mips/include/asm/compat.h:157:9: note: this is the location of the previous definition
     157 | #define is_compat32_task is_compat_task
         |         ^~~~~~~~~~~~~~~~
   drivers/media/rc/bpf-lirc.c: In function 'lirc_prog_query':
>> drivers/media/rc/bpf-lirc.c:297:34: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     297 |         __u32 __user *prog_ids = (__u32 __user *)attr->query.prog_ids;
         |                                  ^


vim +43 net/bpf/bpf_dummy_struct_ops.c

    26	
    27	static struct bpf_dummy_ops_test_args *
    28	dummy_ops_init_args(const union bpf_attr *kattr, unsigned int nr)
    29	{
    30		__u32 size_in;
    31		struct bpf_dummy_ops_test_args *args;
    32		void __user *ctx_in;
    33		void __user *u_state;
    34	
    35		size_in = kattr->test.ctx_size_in;
    36		if (size_in != sizeof(u64) * nr)
    37			return ERR_PTR(-EINVAL);
    38	
    39		args = kzalloc(sizeof(*args), GFP_KERNEL);
    40		if (!args)
    41			return ERR_PTR(-ENOMEM);
    42	
  > 43		ctx_in = (void __user *)kattr->test.ctx_in;
    44		if (copy_from_user(args->args, ctx_in, size_in))
    45			goto out;
    46	
    47		/* args[0] is 0 means state argument of test_N will be NULL */
    48		u_state = (void __user *)args->args[0];
    49		if (u_state && copy_from_user(&args->state, u_state,
    50					      sizeof(args->state)))
    51			goto out;
    52	
    53		return args;
    54	out:
    55		kfree(args);
    56		return ERR_PTR(-EFAULT);
    57	}
    58	

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