linux-kernel - include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):

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Message-ID: <202512150042.fpiqhcnF-lkp@intel.com>
Date: Mon, 15 Dec 2025 00:44:31 +0800
From: kernel test robot <lkp@...el.com>
To: Christian Brauner <brauner@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in
 comparison expression (different address spaces):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8f0b4cce4481fb22653697cced8d0d04027cb1e8
commit: 885fc8ac0a4dc70f5d87b80b0977292870e35c60 nstree: make iterator generic
date:   3 months ago
config: m68k-randconfig-r133-20251214 (https://download.01.org/0day-ci/archive/20251215/202512150042.fpiqhcnF-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 9.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251215/202512150042.fpiqhcnF-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512150042.fpiqhcnF-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   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 *

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@...radead.org>
:::::: CC: Rusty Russell <rusty@...tcorp.com.au>

-- 
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https://github.com/intel/lkp-tests/wiki