mm/sparse.c: allocate memmap preferring the given node

When allocating memmap for hot added memory with the classic sparse, the
specified 'nid' is ignored in populate_section_memmap().

While in allocating memmap for the classic sparse during boot, the node
given by 'nid' is preferred.  And VMEMMAP prefers the node of 'nid' in
both boot stage and memory hot adding.  So seems no reason to not respect
the node of 'nid' for the classic sparse when hot adding memory.

Use kvmalloc_node instead to use the passed in 'nid'.
Signed-off-by: NBaoquan He <bhe@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Reviewed-by: NWei Yang <richard.weiyang@gmail.com>
Acked-by: NMichal Hocko <mhocko@suse.com>
Acked-by: NPankaj Gupta <pankaj.gupta.linux@gmail.com>
Link: http://lkml.kernel.org/r/20200316125625.GH3486@MiWiFi-R3L-srvSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/sparse.c

@@ -664,8 +664,8 @@ static void free_map_bootmem(struct page *memmap)
 struct page * __meminit populate_section_memmap(unsigned long pfn,
 		unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
 {
-	return kvmalloc(array_size(sizeof(struct page),
-				   PAGES_PER_SECTION), GFP_KERNEL);
+	return kvmalloc_node(array_size(sizeof(struct page),
+					PAGES_PER_SECTION), GFP_KERNEL, nid);
 }
 
 static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,