linux-kernel - Re: [PATCH 16/28] maple_tree: Start using maple copy node for destination

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Message-ID: <xeipv5m2xxjfyhoqifdigymobmo5lnh6kqqloowbg4oiejqyp4@ns5iehb3kzof>
Date: Fri, 16 Jan 2026 15:19:30 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: kernel test robot <lkp@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 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>
Subject: Re: [PATCH 16/28] maple_tree: Start using maple copy node for
 destination

* kernel test robot <lkp@...el.com> [260116 04:37]:
> 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/20260115193647.1695937-17-Liam.Howlett%40oracle.com
> patch subject: [PATCH 16/28] maple_tree: Start using maple copy node for destination
> config: x86_64-randconfig-121-20260116 (https://download.01.org/0day-ci/archive/20260116/202601161750.eDtUQiJr-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/20260116/202601161750.eDtUQiJr-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/202601161750.eDtUQiJr-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
> >> lib/maple_tree.c:3355:37: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_enode * @@
>    lib/maple_tree.c:3355:37: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:3355:37: sparse:     got struct maple_enode *
> >> lib/maple_tree.c:3358:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct maple_enode const *entry @@     got void [noderef] __rcu * @@
>    lib/maple_tree.c:3358:17: sparse:     expected struct maple_enode const *entry
>    lib/maple_tree.c:3358:17: sparse:     got void [noderef] __rcu *
> >> lib/maple_tree.c:3397:19: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct maple_enode *node @@     got void [noderef] __rcu * @@
>    lib/maple_tree.c:3397:19: sparse:     expected struct maple_enode *node
>    lib/maple_tree.c:3397:19: sparse:     got void [noderef] __rcu *
>    lib/maple_tree.c:3139:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_enode * @@
>    lib/maple_tree.c:3139:29: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:3139:29: sparse:     got struct maple_enode *
> >> lib/maple_tree.c:2558:52: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct maple_enode *enode @@     got void [noderef] __rcu * @@
>    lib/maple_tree.c:2558:52: sparse:     expected struct maple_enode *enode
>    lib/maple_tree.c:2558:52: sparse:     got void [noderef] __rcu *
>    lib/maple_tree.c:2803:29: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got void *content @@
>    lib/maple_tree.c:2803:29: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:2803:29: sparse:     got void *content
>    lib/maple_tree.c:2806:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got void *entry @@
>    lib/maple_tree.c:2806:23: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:2806:23: sparse:     got void *entry
> >> lib/maple_tree.c:2558:52: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected struct maple_enode *enode @@     got void [noderef] __rcu * @@
>    lib/maple_tree.c:2558:52: sparse:     expected struct maple_enode *enode
>    lib/maple_tree.c:2558:52: sparse:     got void [noderef] __rcu *
>    lib/maple_tree.c:6899:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_node * @@
>    lib/maple_tree.c:6899:30: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:6899:30: sparse:     got struct maple_node *
>    lib/maple_tree.c:6899:30: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void [noderef] __rcu * @@     got struct maple_node * @@
>    lib/maple_tree.c:6899:30: sparse:     expected void [noderef] __rcu *
>    lib/maple_tree.c:6899:30: sparse:     got struct maple_node *
> 
...

Andrew,

Fixing these in patch 16 means that future patches will need fixing.

I can either send you patches to fix up this and subsequent patches.  It
might be better for me to respin the series?

Let me know what you think I should do here.

I'll also include a final patch to correct any other sparse warnings.

Thanks,
Liam