net/ipv6/ip6mr.c:295:24: sparse: sparse: incompatible types in comparison expression (different address spaces):

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f0100363d8c374bd8e9ea7c9ba02744f0b802ca4
commit: 2c309a863dd6e609b10caa55a362dc48d2e04564 ip6mr: Free mr_table after RCU grace period.
date:   4 months ago
config: powerpc64-randconfig-r1309-20260922 (https://download.01.org/0day-ci/archive/20260922/202609221639.e2GA34hZ-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260922/202609221639.e2GA34hZ-lkp@xxxxxxxxx/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
| Fixes: 2c309a863dd6 ("ip6mr: Free mr_table after RCU grace period.")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609221639.e2GA34hZ-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> net/ipv6/ip6mr.c:295:24: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:295:24: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:295:24: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:301:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:301:16: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:301:16: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:301:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:301:16: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:301:16: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:312:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:312:16: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:312:16: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:326:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:326:9: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:326:9: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:332:32: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:332:32: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:332:32: sparse:    struct mr_table *
   net/ipv6/ip6mr.c:336:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/ipv6/ip6mr.c:336:9: sparse:    struct mr_table [noderef] __rcu *
   net/ipv6/ip6mr.c:336:9: sparse:    struct mr_table *

vim +295 net/ipv6/ip6mr.c

   283	
   284	bool ip6mr_rule_default(const struct fib_rule *rule)
   285	{
   286		return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
   287		       rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
   288	}
   289	EXPORT_SYMBOL(ip6mr_rule_default);
   290	#else
   291	static struct mr_table *ip6mr_mr_table_iter(struct net *net,
   292						    struct mr_table *mrt)
   293	{
   294		if (!mrt)
 > 295			return rcu_dereference(net->ipv6.mrt6);
   296		return NULL;
   297	}
   298	

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