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From: Oscar Salvador <>
Subject: [PATCH v1] mm: make alloc_node_mem_map a voidcall if we don't have CONFIG_FLAT_NODE_MEM_MAP
Date: Tue, 14 Nov 2017 12:19:35 +0100
Message-ID: <> (raw)

free_area_init_node() calls alloc_node_mem_map(), but this function
does nothing unless we have CONFIG_FLAT_NODE_MEM_MAP.

As a cleanup, we can move the "#ifdef CONFIG_FLAT_NODE_MEM_MAP" within
alloc_node_mem_map() out of the function, and define a
alloc_node_mem_map() { } when CONFIG_FLAT_NODE_MEM_MAP is not present.

This also moves the printk, that lays within the "#ifdef CONFIG_FLAT_NODE_MEM_MAP" block,
from free_area_init_node() to alloc_node_mem_map(), getting rid of the
"#ifdef CONFIG_FLAT_NODE_MEM_MAP" in free_area_init_node().

Signed-off-by: Oscar Salvador <>
 mm/page_alloc.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 77e4d3c5c57b..56400b5d3183 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6126,6 +6126,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 	unsigned long __maybe_unused start = 0;
@@ -6135,7 +6136,6 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 	if (!pgdat->node_spanned_pages)
 	start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
 	offset = pgdat->node_start_pfn - start;
 	/* ia64 gets its own node_mem_map, before this, without bootmem */
@@ -6157,6 +6157,9 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 		pgdat->node_mem_map = map + offset;
+	printk(KERN_DEBUG "alloc_node_mem_map: node %d, pgdat %08lx, node_mem_map %08lx\n",
+							pgdat->node_id, (unsigned long)pgdat,
+							(unsigned long)pgdat->node_mem_map);
 	 * With no DISCONTIG, the global mem_map is just set as node 0's
@@ -6169,8 +6172,10 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
+static void __ref alloc_node_mem_map(struct pglist_data *pgdat) { }
 void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 		unsigned long node_start_pfn, unsigned long *zholes_size)
@@ -6197,11 +6202,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 				  zones_size, zholes_size);
-	printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n",
-		nid, (unsigned long)pgdat,
-		(unsigned long)pgdat->node_mem_map);

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-14 11:19 Oscar Salvador [this message]
2017-11-14 11:53 ` Michal Hocko

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