linux-kernel - Re: [PATCH 10/28] maple_tree: Introduce maple_copy node and use it in mas_spanning

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Message-ID: <202601161501.NZ3GNDCG-lkp@intel.com>
Date: Fri, 16 Jan 2026 15:45:19 +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 10/28] maple_tree: Introduce maple_copy node and use it
 in mas_spanning_rebalance()

Hi Liam,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on next-20260115]
[cannot apply to akpm-mm/mm-nonmm-unstable soc/for-next linus/master v6.19-rc5]
[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-Move-mas_spanning_rebalance-loop-to-function/20260116-034135
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260115193647.1695937-11-Liam.Howlett%40oracle.com
patch subject: [PATCH 10/28] maple_tree: Introduce maple_copy node and use it in mas_spanning_rebalance()
config: x86_64-randconfig-121-20260116 (https://download.01.org/0day-ci/archive/20260116/202601161501.NZ3GNDCG-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601161501.NZ3GNDCG-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/202601161501.NZ3GNDCG-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> lib/maple_tree.c:2621:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got void *content @@
   lib/maple_tree.c:2621:29: sparse:     expected void [noderef] __rcu *
   lib/maple_tree.c:2621:29: sparse:     got void *content
>> lib/maple_tree.c:2624:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got void *entry @@
   lib/maple_tree.c:2624:23: sparse:     expected void [noderef] __rcu *
   lib/maple_tree.c:2624:23: sparse:     got void *entry
   lib/maple_tree.c:2680:17: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu **b_slots @@     got void [noderef] __rcu * @@
   lib/maple_tree.c:2680:17: sparse:     expected void [noderef] __rcu **b_slots
   lib/maple_tree.c:2680:17: sparse:     got void [noderef] __rcu *
   lib/maple_tree.c:6412:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_node * @@
   lib/maple_tree.c:6412:30: sparse:     expected void [noderef] __rcu *
   lib/maple_tree.c:6412:30: sparse:     got struct maple_node *
   lib/maple_tree.c:6412:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_node * @@
   lib/maple_tree.c:6412:30: sparse:     expected void [noderef] __rcu *
   lib/maple_tree.c:6412:30: sparse:     got struct maple_node *

vim +2621 lib/maple_tree.c

  2603	
  2604	/*
  2605	 * cp_leaf_init() - Initialize a maple_copy node for the leaf level of a
  2606	 * spanning store
  2607	 * @cp: The maple copy node
  2608	 * @mas: The maple state
  2609	 * @l_wr_mas: The left write state of the spanning store
  2610	 * @r_wr_mas: The right write state of the spanning store
  2611	 */
  2612	static inline void cp_leaf_init(struct maple_copy *cp,
  2613			struct ma_state *mas, struct ma_wr_state *l_wr_mas,
  2614			struct ma_wr_state *r_wr_mas)
  2615	{
  2616		unsigned char end = 0;
  2617	
  2618		/* Create entries to insert including split entries to left and right */
  2619		if (l_wr_mas->r_min < mas->index) {
  2620			end++;
> 2621			cp->slot[0] = l_wr_mas->content;
  2622			cp->pivot[0] = mas->index - 1;
  2623		}
> 2624		cp->slot[end] = l_wr_mas->entry;
  2625		cp->pivot[end] = mas->last;
  2626	
  2627		if (r_wr_mas->end_piv > mas->last) {
  2628			end++;
  2629			cp->slot[end] = r_wr_mas->slots[r_wr_mas->offset_end];
  2630			cp->pivot[end] = r_wr_mas->end_piv;
  2631		}
  2632	
  2633		cp->min = l_wr_mas->r_min;
  2634		cp->max = cp->pivot[end];
  2635		cp->end = end;
  2636	}
  2637	

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