From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3447C40855 for ; Fri, 30 Jan 2026 18:02:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769796134; cv=none; b=PnqZTOwR7ku63g6oNeYVfDq5MKvZr2k/hamxe9igC7fyHPVUViMlYgRivg9og30RhqWnUhZvnSXSqRNjItvDO/XPO+dbwf5LiqkynQpz1c7GlzlNxA4QTNh31BnQ5sCsUHLTzVXhkcKU8O89Rk+4dno2LyDVacEbUVF0KQNTTqI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769796134; c=relaxed/simple; bh=GkPfhZNy4v37hIGDotZeCuD9mCNHLcE+cuTB3+wI914=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=A795zWsHV4Lkjr/9VJPITKzTwbblpO3zsQ8YJkfYB8I5G+XB9QiQ6GurBvjbars0dXsNgAjLcQV11nBnlUPplkzc9CIFdkqoiRp8AC0RyZDjCN18ct2OrfbJ74rMfVNgkitGN8brgBYeMIqTbDESFZXTzayylFW5ftUA4DcvwU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=IXfWF+Eb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="IXfWF+Eb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 663C5C116C6; Fri, 30 Jan 2026 18:02:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1769796133; bh=GkPfhZNy4v37hIGDotZeCuD9mCNHLcE+cuTB3+wI914=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=IXfWF+EbecoU0pgM7B+mRYloF0rvlkPEnOavouSEo+EpSfkHpiA8EMis5IvvjZ44D yudmu3SItHvXjN5+XaNyqw95rLplMYX6df2qSDcqVbquXKBlNUfVsTo7MQmtDl3B7C YLHPg/pWCoYV6+/tyb0EkvGxUjVeM7spmF6vdSD0= Date: Fri, 30 Jan 2026 10:02:12 -0800 From: Andrew Morton To: "Liam R. Howlett" Cc: Mark Brown , 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: <20260130100212.61b66204717cecc40e8750cf@linux-foundation.org> In-Reply-To: References: <20260121164526.2093265-1-Liam.Howlett@oracle.com> <20260121164526.2093265-23-Liam.Howlett@oracle.com> <20260127151548.b57825c664d36fbff70ffa7c@linux-foundation.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 30 Jan 2026 11:42:49 -0500 "Liam R. Howlett" wrote: > * Andrew Morton [260127 18:16]: > > 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. > > > > > > 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? A new patchset works. I'll send my heres-what-changed-since v2 email to aid people who reviewed v2 and so you can scan it and think "yup, I meant to do that".