linux-kernel - Re: [PATCH v2 22/29] maple_tree: Use maple copy node for mas_wr

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Message-ID: <vb2xas75xigzauqkfey7amtb6ux5oz4vnfxx7u7oks3nzbggy7@eaheqgwtwa34>
Date: Fri, 30 Jan 2026 11:42:49 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mark Brown <broonie@...nel.org>, maple-tree@...ts.infradead.org,
        linux-mm@...ck.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>,
        Aishwarya.TCV@....com
Subject: Re: [PATCH v2 22/29] maple_tree: Use maple copy node for
 mas_wr_rebalance() operation

* Andrew Morton <akpm@...ux-foundation.org> [260127 18:16]:
> On Tue, 27 Jan 2026 23:05:48 +0000 Mark Brown <broonie@...nel.org> wrote:
> 
> > On Wed, Jan 21, 2026 at 11:45:19AM -0500, Liam R. Howlett wrote:
> > > Stop using the maple big node for rebalance operations by changing to
> > > more align with spanning store.  The rebalance operation needs its own
> > > data calculation in rebalance_data().
> > > 
> > > In the event of too much data, the rebalance tries to push the data
> > > using push_data_sib().  If there is insufficient data, the rebalance
> > > operation will rebalance against a sibling (found with rebalance_sib()).
> > 
> > I'm seeing a test failure in the LTP linkat02 test on arm64 which we're
> > also seeing on a range of platforms in the Arm lab.  A NULL pointer
> > deference is generated handling the syscall in the updated code (log for
> > the actual next-20260126 commit):
> 
> Cool, thanks.
> 
> Liam, I'll move this series back into mm-new to avoid disrupting
> linux-next testing.
> 
> 

I know you like fixup patches on larger sets, but I've done three things
to the patch set now:

1. A small fix for this issue
2. Added a new test in its own patch for this issue
3. Cleaned up the old compiler pointer warning in a more readable way

Would you like me to send the delta or a new patch set?

Thanks,
Liam