mm/page_alloc.c: remove unused free_bootmem_with_active_regions

Since commit 397dc00e ("mips: sgi-ip27: switch from DISCONTIGMEM
to SPARSEMEM"), the last caller of free_bootmem_with_active_regions() was
gone.  Now no user calls it any more.

Let's remove it.
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Link: http://lkml.kernel.org/r/20200402143455.5145-1-bhe@redhat.comSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm.h

@@ -2415,8 +2415,6 @@ static inline unsigned long get_num_physpages(void)
  * 	memblock_add_node(base, size, nid)
  * free_area_init(max_zone_pfns);
  *
- * free_bootmem_with_active_regions() calls free_bootmem_node() for each
- * registered physical page range.  Similarly
  * sparse_memory_present_with_active_regions() calls memory_present() for
  * each range when SPARSEMEM is enabled.
  */
@@ -2429,8 +2427,6 @@ extern unsigned long absent_pages_in_range(unsigned long start_pfn,
 extern void get_pfn_range_for_nid(unsigned int nid,
 			unsigned long *start_pfn, unsigned long *end_pfn);
 extern unsigned long find_min_pfn_with_active_regions(void);
-extern void free_bootmem_with_active_regions(int nid,
-						unsigned long max_low_pfn);
 extern void sparse_memory_present_with_active_regions(int nid);
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES

mm/page_alloc.c

@@ -6295,31 +6295,6 @@ void __meminit init_currently_empty_zone(struct zone *zone,
 	zone->initialized = 1;
 }
 
-/**
- * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range
- * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed.
- * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid
- *
- * If an architecture guarantees that all ranges registered contain no holes
- * and may be freed, this this function may be used instead of calling
- * memblock_free_early_nid() manually.
- */
-void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn)
-{
-	unsigned long start_pfn, end_pfn;
-	int i, this_nid;
-
-	for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) {
-		start_pfn = min(start_pfn, max_low_pfn);
-		end_pfn = min(end_pfn, max_low_pfn);
-
-		if (start_pfn < end_pfn)
-			memblock_free_early_nid(PFN_PHYS(start_pfn),
-					(end_pfn - start_pfn) << PAGE_SHIFT,
-					this_nid);
-	}
-}
-
 /**
  * sparse_memory_present_with_active_regions - Call memory_present for each active range
  * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used.