mm/page_alloc: refactor build_node_zonelist() out of build_zonelists()

Extract per-node fallback-list construction into build_node_zonelist().
Build each selected node directly into the destination zonelist so no
intermediate node_order array or node count is needed. Print the
fallback order as each node is added.

This lets us build new zonelists from candidate nodemasks instead of
just the default N_MEMORY node state list.

Add a zlidx argument so callers explicitly select the destination
zonelist. The existing caller continues to use ZONELIST_FALLBACK.

No functional change: build_zonelists() builds and prints the same
FALLBACK list over N_MEMORY with node_load updates as before.

Link: https://lore.kernel.org/20260923022902.2433614-3-gourry@gourry.net
Signed-off-by: Gregory Price <gourry@gourry.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>

0 files changed, 0 insertions, 0 deletions