linux-kernel - Re: [PATCH v2 17/29] maple_tree: Start using maple copy node for destination

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Message-ID: <202601220811.ac3t5OuP-lkp@intel.com>
Date: Thu, 22 Jan 2026 09:44:37 +0800
From: kernel test robot <lkp@...el.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	maple-tree@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Suren Baghdasaryan <surenb@...gle.com>,
	Matthew Wilcox <willy@...radead.org>,
	Sidhartha Kumar <sidhartha.kumar@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Alice Ryhl <aliceryhl@...gle.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>,
	Christian Kujau <lists@...dbynature.de>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: Re: [PATCH v2 17/29] maple_tree: Start using maple copy node for
 destination

Hi Liam,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on next-20260121]
[cannot apply to akpm-mm/mm-nonmm-unstable soc/for-next linus/master v6.19-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Liam-R-Howlett/maple_tree-Fix-mas_dup_alloc-sparse-warning/20260122-023746
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260121164526.2093265-18-Liam.Howlett%40oracle.com
patch subject: [PATCH v2 17/29] maple_tree: Start using maple copy node for destination
config: sparc-randconfig-002-20260122 (https://download.01.org/0day-ci/archive/20260122/202601220811.ac3t5OuP-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601220811.ac3t5OuP-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/202601220811.ac3t5OuP-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from ./arch/sparc/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:380,
                    from include/linux/array_size.h:5,
                    from include/linux/kernel.h:16,
                    from include/linux/maple_tree.h:11,
                    from lib/maple_tree.c:56:
   lib/maple_tree.c: In function 'cp_dst_to_slots':
>> include/linux/rcupdate.h:555:36: error: dereferencing pointer to incomplete type 'struct maple_enode'
    #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
                                       ^~~~
   include/asm-generic/rwonce.h:55:33: note: in definition of macro '__WRITE_ONCE'
     *(volatile typeof(x) *)&(x) = (val);    \
                                    ^~~
   include/linux/rcupdate.h:1046:3: note: in expansion of macro 'WRITE_ONCE'
      WRITE_ONCE(p, RCU_INITIALIZER(v)); \
      ^~~~~~~~~~
   include/linux/rcupdate.h:1046:17: note: in expansion of macro 'RCU_INITIALIZER'
      WRITE_ONCE(p, RCU_INITIALIZER(v)); \
                    ^~~~~~~~~~~~~~~
   lib/maple_tree.c:3155:3: note: in expansion of macro 'RCU_INIT_POINTER'
      RCU_INIT_POINTER(cp->slot[d], mt_mk_node(mn, mt));
      ^~~~~~~~~~~~~~~~


vim +555 include/linux/rcupdate.h

ca5ecddfa8fcbd Paul E. McKenney 2010-04-28  550  
462225ae47d717 Paul E. McKenney 2013-11-11  551  /**
462225ae47d717 Paul E. McKenney 2013-11-11  552   * RCU_INITIALIZER() - statically initialize an RCU-protected global variable
462225ae47d717 Paul E. McKenney 2013-11-11  553   * @v: The value to statically initialize with.
462225ae47d717 Paul E. McKenney 2013-11-11  554   */
462225ae47d717 Paul E. McKenney 2013-11-11 @555  #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
462225ae47d717 Paul E. McKenney 2013-11-11  556  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki