Merge tag 'page_alloc-for-7.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/mm/page_allocHEADmaster

Pull page allocator fixes from Vlastimil Babka:

 - Stable fixes for various races of page allocator's reading of
   zonelists and memory hotplug activity. These can result in BUGs,
   allocation failures or allocations from wrong nodes (Gregory Price,
   Josef Bacik)

 - Stable fixes for bugs free_pages_nolock(), page_frag allocation, page
   isolation, that can trigger WARNs, degraded operation or infinite
   loop (Josef Bacik)

* tag 'page_alloc-for-7.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/mm/page_alloc:
  mm/page_alloc: remove the zone_spans_pfn() check from get_pfnblock_bitmap_bitidx()
  mm/memory_hotplug: resize zones under their seqlock
  mm: page_isolation: do not take slab pages for free
  mm: page_frag: refill the cache for large fragments
  mm/page_alloc: clear ->private of deferred free pages
  mm/page_alloc: don't undo another isolation in alloc_contig_range
  mm/mmzone: remove zonelist_node_idx()
  mm/mempolicy: read the zoneref slot once in mempolicy_slab_node()
  mm/page_alloc: retry alloc_contig_pages() when the zonelist is rebuilt
  mm/hugetlb: retry the pool walk when the zonelist is rebuilt
  mm/page_alloc: retry allocations that raced with a zonelist rebuild
  mm/mmzone: read each zoneref slot once when filtering by nodemask
  mm/page_alloc: snapshot the preferred zone against shrink rebuilds
  mm/mmzone: read the zoneref slot once in zonelist_zone()
  mm/page_alloc: detect zonelist rebuilds from memory hot-add
  mm, page_alloc: pass zone pointer to trace_reclaim_retry_zone
  mm/page_alloc: keep the pagesets of an empty zone
  mm/page_alloc: reset can_retry_reserves when the slowpath restarts

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