[brauner-github:namespace-6.19 13/73] kernel/nstree.c:7:28: sparse: sparse: symbol 'ns_tree_lock' was not declared. Should it be static?

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

tree:   https://github.com/brauner/linux.git namespace-6.19
head:   232affb34bfb5be4df33a3e7bc92154e38f74535
commit: 6696d17cfe2b00c43717aecab6f461e1a68c7b28 [13/73] nstree: introduce a unified tree
config: nios2-randconfig-r113-20251031 (https://download.01.org/0day-ci/archive/20251031/202510311331.IAWNYwBY-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251031/202510311331.IAWNYwBY-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/202510311331.IAWNYwBY-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/nstree.c:7:28: sparse: sparse: symbol 'ns_tree_lock' was not declared. Should it be static?
   kernel/nstree.c: note: in included file (through include/linux/ns_common.h, include/linux/nstree.h):
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *

vim +/ns_tree_lock +7 kernel/nstree.c

     6	
   > 7	__cacheline_aligned_in_smp DEFINE_SEQLOCK(ns_tree_lock);
     8	static struct rb_root ns_unified_tree = RB_ROOT; /* protected by ns_tree_lock */
     9	

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