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

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Message-Id: <20260127151548.b57825c664d36fbff70ffa7c@linux-foundation.org>
Date: Tue, 27 Jan 2026 15:15:48 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mark Brown <broonie@...nel.org>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 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

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.