[PATCH v2 0/5] mm, page_alloc: several stable fixes

[Vlastimil Babka (SUSE)]

A bunch of fixes from Josef, filtered for page allocator by David.

I have tweaked some commit logs and a comment in one case.

In v2 some were dropped as they were merged already, the last one was
changed to fix things differently. "mm/compaction: trust
zone->contiguous only in the span" was dropped due to lots of sashiko
feedback. compaction (as a pfn scanner) needs much more thought

Based on page_alloc/for-next-fixes, to be applied there as well.

Signed-off-by: Vlastimil Babka (SUSE) <vbabka@xxxxxxxxxx>
---
Changes in v2:
- rebased on page_alloc/for-next-fixes
- dropped 3 patches that were already merged from Gregory
- dropped "mm/compaction: trust zone->contiguous only in the span" as it
  needs more thougt
- in the last patch, remove the VM_BUG_ON_PAGE completely
- Link to v1: https://patch.msgid.link/20261027-pgalloc-ai-hotfixes-v1-0-9c7d1aca801e@xxxxxxxxxx

---
Josef Bacik (4):
      mm/page_alloc: clear ->private of deferred free pages
      mm: page_frag: refill the cache for large fragments
      mm: page_isolation: do not take slab pages for free
      mm/memory_hotplug: resize zones under their seqlock

Vlastimil Babka (SUSE) (1):
      mm/page_alloc: remove the zone_spans_pfn() check from get_pfnblock_bitmap_bitidx()

 mm/memory_hotplug.c  | 51 +++++++++++++++++++++++++++++++++++----------------
 mm/page_alloc.c      |  3 ++-
 mm/page_frag_cache.c | 21 +++++++++++++--------
 mm/page_isolation.c  |  7 +++++++
 4 files changed, 57 insertions(+), 25 deletions(-)
---
base-commit: 743a99d7e339e81acaf76f3c902b23abb29abc15
change-id: 20261027-pgalloc-ai-hotfixes-59bcd873a355