x86/mm/32: Remove unused node_memmap_size_bytes() & CONFIG_NEED_NODE_MEMMAP_SIZE logic

node_memmap_size_bytes() has been unused since the v3.9 kernel, so remove it.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Fixes: f03574f2 ("x86-32, mm: Rip out x86_32 NUMA remapping code")
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1803262325540.256524@chino.kir.corp.google.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/Kconfig

@@ -1608,10 +1608,6 @@ config ARCH_HAVE_MEMORY_PRESENT
 	def_bool y
 	depends on X86_32 && DISCONTIGMEM
 
-config NEED_NODE_MEMMAP_SIZE
-	def_bool y
-	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
-
 config ARCH_FLATMEM_ENABLE
 	def_bool y
 	depends on X86_32 && !NUMA

arch/x86/mm/numa_32.c

@@ -60,17 +60,6 @@ void memory_present(int nid, unsigned long start, unsigned long end)
 	}
 	printk(KERN_CONT "\n");
 }
-
-unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
-					      unsigned long end_pfn)
-{
-	unsigned long nr_pages = end_pfn - start_pfn;
-
-	if (!nr_pages)
-		return 0;
-
-	return (nr_pages + 1) * sizeof(struct page);
-}
 #endif
 
 extern unsigned long highend_pfn, highstart_pfn;

include/linux/mmzone.h

@@ -816,10 +816,6 @@ int local_memory_node(int node_id);
 static inline int local_memory_node(int node_id) { return node_id; };
 #endif
 
-#ifdef CONFIG_NEED_NODE_MEMMAP_SIZE
-unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
-#endif
-
 /*
  * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc.
  */
@@ -1289,7 +1285,6 @@ struct mminit_pfnnid_cache {
 #endif
 
 void memory_present(int nid, unsigned long start, unsigned long end);
-unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
 
 /*
  * If it is possible to have holes within a MAX_ORDER_NR_PAGES, then we

mm/sparse.c

@@ -235,28 +235,6 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
 	}
 }
 
-/*
- * Only used by the i386 NUMA architecures, but relatively
- * generic code.
- */
-unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
-						     unsigned long end_pfn)
-{
-	unsigned long pfn;
-	unsigned long nr_pages = 0;
-
-	mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
-	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
-		if (nid != early_pfn_to_nid(pfn))
-			continue;
-
-		if (pfn_present(pfn))
-			nr_pages += PAGES_PER_SECTION;
-	}
-
-	return nr_pages * sizeof(struct page);
-}
-
 /*
  * Subtle, we encode the real pfn into the mem_map such that
  * the identity pfn - section_mem_map will return the actual