[PATCH v2 22/29] maple_tree: Use maple copy node for mas_wr_rebalance() operation

[Andrew Morton]

On Tue, 27 Jan 2026 23:05:48 +0000 Mark Brown <broonie at kernel.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.