include/linux/rbtree.h:74:9: 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/torvalds/linux.git master
head:   a5806cd506af5a7c19bcd596e4708b5c464bfd21
commit: 2c9e5d4a008293407836d29d35dfd4353615bd2f bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of
date:   1 year ago
config: powerpc64-randconfig-r121-20250520 (https://download.01.org/0day-ci/archive/20250520/202505201742.5rpaA9Qr-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 7.5.0
reproduce: (https://download.01.org/0day-ci/archive/20250520/202505201742.5rpaA9Qr-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/202505201742.5rpaA9Qr-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   kernel/bpf/core.c:241:49: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:1997:43: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2002:48: sparse: sparse: arithmetics on pointers to functions
   kernel/bpf/core.c:2268:77: sparse: sparse: subtraction of functions? Share your drugs
   kernel/bpf/core.c: note: in included file (through include/trace/trace_events.h, include/trace/define_trace.h, include/trace/events/xdp.h, ...):
   include/trace/events/xdp.h:321:1: sparse: sparse: Using plain integer as NULL pointer
   include/trace/events/xdp.h:348:1: sparse: sparse: Using plain integer as NULL pointer
   include/trace/events/xdp.h:382:1: sparse: sparse: Using plain integer as NULL pointer
   kernel/bpf/core.c: note: in included file (through include/linux/rbtree_latch.h, include/linux/bpf.h, include/linux/filter.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 +74 include/linux/rbtree.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  67  
d72da4a4d973d8 Peter Zijlstra 2015-05-27  68  static inline void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent,
d72da4a4d973d8 Peter Zijlstra 2015-05-27  69  				    struct rb_node **rb_link)
d72da4a4d973d8 Peter Zijlstra 2015-05-27  70  {
d72da4a4d973d8 Peter Zijlstra 2015-05-27  71  	node->__rb_parent_color = (unsigned long)parent;
d72da4a4d973d8 Peter Zijlstra 2015-05-27  72  	node->rb_left = node->rb_right = NULL;
d72da4a4d973d8 Peter Zijlstra 2015-05-27  73  
d72da4a4d973d8 Peter Zijlstra 2015-05-27 @74  	rcu_assign_pointer(*rb_link, node);
d72da4a4d973d8 Peter Zijlstra 2015-05-27  75  }
d72da4a4d973d8 Peter Zijlstra 2015-05-27  76  

:::::: The code at line 74 was first introduced by commit
:::::: d72da4a4d973d8a0a0d3c97e7cdebf287fbe3a99 rbtree: Make lockless searches non-fatal

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: CC: Rusty Russell <rusty@rustcorp.com.au>

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