[rgushchin:bpfoom.3.9 8/16] mm/bpf_oom.c:107:13: sparse: sparse: incorrect type in initializer (different address spaces)

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

tree:   https://github.com/rgushchin/linux.git bpfoom.3.9
head:   9d2b723568aae6a6f7e41fc66f65f8b009690b6e
commit: 36dfd96fa3fbd7d4057fe22dfa657b62a9b6865b [8/16] mm: introduce BPF OOM struct ops
config: x86_64-randconfig-123-20260115 (https://download.01.org/0day-ci/archive/20260116/202601160032.yInQO0DO-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601160032.yInQO0DO-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/202601160032.yInQO0DO-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/bpf_oom.c:51:58: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct bpf_map *map @@     got struct bpf_map [noderef] __rcu *map @@
   mm/bpf_oom.c:51:58: sparse:     expected struct bpf_map *map
   mm/bpf_oom.c:51:58: sparse:     got struct bpf_map [noderef] __rcu *map
>> mm/bpf_oom.c:107:13: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct bpf_struct_ops_link [noderef] __rcu *__new @@     got struct bpf_struct_ops_link *st_link @@
   mm/bpf_oom.c:107:13: sparse:     expected struct bpf_struct_ops_link [noderef] __rcu *__new
   mm/bpf_oom.c:107:13: sparse:     got struct bpf_struct_ops_link *st_link
   mm/bpf_oom.c:125:9: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct bpf_struct_ops_link [noderef] __rcu *__old @@     got struct bpf_struct_ops_link *st_link @@
   mm/bpf_oom.c:125:9: sparse:     expected struct bpf_struct_ops_link [noderef] __rcu *__old
   mm/bpf_oom.c:125:9: sparse:     got struct bpf_struct_ops_link *st_link
   mm/bpf_oom.c:125:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   mm/bpf_oom.c:125:9: sparse:    struct bpf_struct_ops_link [noderef] __rcu *
   mm/bpf_oom.c:125:9: sparse:    struct bpf_struct_ops_link *

vim +107 mm/bpf_oom.c

    93	
    94	static int bpf_oom_ops_reg(void *kdata, struct bpf_link *link)
    95	{
    96		struct bpf_struct_ops_link *st_link = (struct bpf_struct_ops_link *)link;
    97		struct cgroup *cgrp;
    98	
    99		/* The link is not yet fully initialized, but cgroup should be set */
   100		if (!link)
   101			return -EOPNOTSUPP;
   102	
   103		cgrp = st_link->cgroup;
   104		if (!cgrp)
   105			return -EINVAL;
   106	
 > 107		if (cmpxchg(&cgrp->bpf.bpf_oom_link, NULL, st_link))
   108			return -EEXIST;
   109	
   110		return 0;
   111	}
   112	

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