[djwong-xfs:djwong-wtf 111/117] fs/xfs/xfs_healthmon.c:72:14: sparse: sparse: incompatible types in comparison expression (different address spaces):

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git djwong-wtf
head:   b26d191b36748da1afef6227d8de4bd258015b48
commit: 50ea06949a53186ea95fb6f84cd1712b2eca258e [111/117] xfs: fix potential pointer access race in xfs_healthmon_get
config: mips-randconfig-r121-20260215 (https://download.01.org/0day-ci/archive/20260215/202602151111.adtkFni9-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260215/202602151111.adtkFni9-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/202602151111.adtkFni9-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/xfs/xfs_healthmon.c:72:14: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xfs/xfs_healthmon.c:72:14: sparse:    struct xfs_healthmon [noderef] __rcu *
   fs/xfs/xfs_healthmon.c:72:14: sparse:    struct xfs_healthmon *
   fs/xfs/xfs_healthmon.c:113:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xfs/xfs_healthmon.c:113:13: sparse:    struct xfs_healthmon [noderef] __rcu *
   fs/xfs/xfs_healthmon.c:113:13: sparse:    struct xfs_healthmon *
   fs/xfs/xfs_healthmon.c:119:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xfs/xfs_healthmon.c:119:9: sparse:    struct xfs_healthmon [noderef] __rcu *
   fs/xfs/xfs_healthmon.c:119:9: sparse:    struct xfs_healthmon *
   fs/xfs/xfs_healthmon.c:137:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xfs/xfs_healthmon.c:137:9: sparse:    struct xfs_healthmon [noderef] __rcu *
   fs/xfs/xfs_healthmon.c:137:9: sparse:    struct xfs_healthmon *

vim +72 fs/xfs/xfs_healthmon.c

    63	
    64	/* Grab a reference to the healthmon object for a given mount, if any. */
    65	static struct xfs_healthmon *
    66	xfs_healthmon_get(
    67		struct xfs_mount		*mp)
    68	{
    69		struct xfs_healthmon		*hm;
    70	
    71		rcu_read_lock();
  > 72		hm = rcu_dereference(mp->m_healthmon);
    73		if (hm && !refcount_inc_not_zero(&hm->ref))
    74			hm = NULL;
    75		rcu_read_unlock();
    76	
    77		return hm;
    78	}
    79	

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