memblock: drop for_each_free_mem_pfn_range_in_zone_from()

for_each_free_mem_pfn_range_in_zone_from() and its "backend" implementation
__next_mem_pfn_range_in_zone() were only used by deferred initialization of
the memory map.

Remove them as they are not used anymore.

Reviewed-by: Wei Yang <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
Signed-off-by: Mike Rapoport (Microsoft) <[e-mail]>

.clang-format

···
   - 'for_each_fib6_node_rt_rcu'
   - 'for_each_fib6_walker_rt'
   - 'for_each_file_lock'
-  - 'for_each_free_mem_pfn_range_in_zone_from'
   - 'for_each_free_mem_range'
   - 'for_each_free_mem_range_reverse'
   - 'for_each_func_rsrc'

include/linux/memblock.h

···
 	for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
 	     i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
 
-#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
-void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
-				  unsigned long *out_spfn,
-				  unsigned long *out_epfn);
-
-/**
- * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
- * free memblock areas from a given point
- * @i: u64 used as loop variable
- * @zone: zone in which all of the memory blocks reside
- * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
- * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
- *
- * Walks over free (memory && !reserved) areas of memblock in a specific
- * zone, continuing from current position. Available as soon as memblock is
- * initialized.
- */
-#define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \
-	for (; i != U64_MAX;					  \
-	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
-
-#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 
 /**
  * for_each_free_mem_range - iterate through free memblock areas

mm/memblock.c

···
 	return 0;
 }
 
-#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
-/**
- * __next_mem_pfn_range_in_zone - iterator for for_each_*_range_in_zone()
- *
- * @idx: pointer to u64 loop variable
- * @zone: zone in which all of the memory blocks reside
- * @out_spfn: ptr to ulong for start pfn of the range, can be %NULL
- * @out_epfn: ptr to ulong for end pfn of the range, can be %NULL
- *
- * This function is meant to be a zone/pfn specific wrapper for the
- * for_each_mem_range type iterators. Specifically they are used in the
- * deferred memory init routines and as such we were duplicating much of
- * this logic throughout the code. So instead of having it in multiple
- * locations it seemed like it would make more sense to centralize this to
- * one new iterator that does everything they need.
- */
-void __init_memblock
-__next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
-			     unsigned long *out_spfn, unsigned long *out_epfn)
-{
-	int zone_nid = zone_to_nid(zone);
-	phys_addr_t spa, epa;
-
-	__next_mem_range(idx, zone_nid, MEMBLOCK_NONE,
-			 &memblock.memory, &memblock.reserved,
-			 &spa, &epa, NULL);
-
-	while (*idx != U64_MAX) {
-		unsigned long epfn = PFN_DOWN(epa);
-		unsigned long spfn = PFN_UP(spa);
-
-		/*
-		 * Verify the end is at least past the start of the zone and
-		 * that we have at least one PFN to initialize.
-		 */
-		if (zone->zone_start_pfn < epfn && spfn < epfn) {
-			/* if we went too far just stop searching */
-			if (zone_end_pfn(zone) <= spfn) {
-				*idx = U64_MAX;
-				break;
-			}
-
-			if (out_spfn)
-				*out_spfn = max(zone->zone_start_pfn, spfn);
-			if (out_epfn)
-				*out_epfn = min(zone_end_pfn(zone), epfn);
-
-			return;
-		}
-
-		__next_mem_range(idx, zone_nid, MEMBLOCK_NONE,
-				 &memblock.memory, &memblock.reserved,
-				 &spa, &epa, NULL);
-	}
-
-	/* signal end of iteration */
-	if (out_spfn)
-		*out_spfn = ULONG_MAX;
-	if (out_epfn)
-		*out_epfn = 0;
-}
-
-#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
-
 /**
  * memblock_alloc_range_nid - allocate boot memory block
  * @size: size of memory block to be allocated in bytes