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Howlett" , maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Suren Baghdasaryan , Matthew Wilcox , Sidhartha Kumar , Vlastimil Babka , Alice Ryhl , Kuninori Morimoto , Geert Uytterhoeven , Arnd Bergmann , Christian Kujau , Aishwarya.TCV@arm.com Subject: Re: [PATCH v2 22/29] maple_tree: Use maple copy node for mas_wr_rebalance() operation Message-Id: <20260127151548.b57825c664d36fbff70ffa7c@linux-foundation.org> In-Reply-To: References: <20260121164526.2093265-1-Liam.Howlett@oracle.com> <20260121164526.2093265-23-Liam.Howlett@oracle.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: F0E4EC000E X-Stat-Signature: 5bhpbemzkmshp94xj7b4rh4rwgigbp1c X-Rspam-User: X-HE-Tag: 1769555749-344000 X-HE-Meta: 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 iI+MY2Er dlSth X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 27 Jan 2026 23:05:48 +0000 Mark Brown 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.