Re: [PATCH v2] mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug

[Mike Rapoport]

On Wed, 01 Jul 2026 18:16:13 -0400, Gregory Price wrote:
> We miss a failed allocation check for pgdat->per_cpu_nodestats, which
> results in a NULL deref when we offset into the per-cpu area.
> 
> Propagate -ENOMEM up the stack and leave per_cpu_nodestats pointing
> at boot_nodestats so a later online can retry the allocation.
> 
> hotadd_init_pgdat() returns NULL on failure, which __try_online_node()
> already maps to -ENOMEM.
> 
> [...]

Applied to fixes branch of memblock.git tree, thanks!

[1/1] mm/mm_init: handle alloc_percpu failure in free_area_init_core_hotplug
      commit: 2ebce860bdd7ae5e13002811bc9bbbf33fcfc221

tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
branch: fixes

--
Sincerely yours,
Mike.