mm/hotplug: mark memory hotplug code in page_alloc.c as __meminit

Mark functions used by both boot and memory hotplug as __meminit to reduce
memory footprint when memory hotplug is disabled.

Alos guard zone_pcp_update() with CONFIG_MEMORY_HOTPLUG because it's only
used by memory hotplug code.

Signed-off-by: Jiang Liu <liuj97@gmail.com>
Cc: Wei Wang <Bessel.Wang@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Keping Chen <chenkeping@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3690132fcb0a6b74d332f7004ef90619248e91f7..5b0d64ad2affcb7049fdfc5f21b358a1aa51bc12 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3410,7 +3410,7 @@ static void setup_zone_pageset(struct zone *zone);
 DEFINE_MUTEX(zonelists_mutex);
 
 /* return values int ....just for stop_machine() */
-static __init_refok int __build_all_zonelists(void *data)
+static int __build_all_zonelists(void *data)
 {
        int nid;
        int cpu;
@@ -3754,7 +3754,7 @@ static void __meminit zone_init_free_lists(struct zone *zone)
        memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY)
 #endif
 
-static int zone_batchsize(struct zone *zone)
+static int __meminit zone_batchsize(struct zone *zone)
 {
 #ifdef CONFIG_MMU
        int batch;
@@ -3836,7 +3836,7 @@ static void setup_pagelist_highmark(struct per_cpu_pageset *p,
                pcp->batch = PAGE_SHIFT * 8;
 }
 
-static void setup_zone_pageset(struct zone *zone)
+static void __meminit setup_zone_pageset(struct zone *zone)
 {
        int cpu;
 
@@ -3909,33 +3909,6 @@ int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
        return 0;
 }
 
-static int __zone_pcp_update(void *data)
-{
-       struct zone *zone = data;
-       int cpu;
-       unsigned long batch = zone_batchsize(zone), flags;
-
-       for_each_possible_cpu(cpu) {
-               struct per_cpu_pageset *pset;
-               struct per_cpu_pages *pcp;
-
-               pset = per_cpu_ptr(zone->pageset, cpu);
-               pcp = &pset->pcp;
-
-               local_irq_save(flags);
-               if (pcp->count > 0)
-                       free_pcppages_bulk(zone, pcp->count, pcp);
-               setup_pageset(pset, batch);
-               local_irq_restore(flags);
-       }
-       return 0;
-}
-
-void zone_pcp_update(struct zone *zone)
-{
-       stop_machine(__zone_pcp_update, zone, NULL);
-}
-
 static __meminit void zone_pcp_init(struct zone *zone)
 {
        /*
@@ -3951,7 +3924,7 @@ static __meminit void zone_pcp_init(struct zone *zone)
                                         zone_batchsize(zone));
 }
 
-__meminit int init_currently_empty_zone(struct zone *zone,
+int __meminit init_currently_empty_zone(struct zone *zone,
                                        unsigned long zone_start_pfn,
                                        unsigned long size,
                                        enum memmap_context context)
@@ -4764,7 +4737,7 @@ out:
 }
 
 /* Any regular memory on that node ? */
-static void check_for_regular_memory(pg_data_t *pgdat)
+static void __init check_for_regular_memory(pg_data_t *pgdat)
 {
 #ifdef CONFIG_HIGHMEM
        enum zone_type zone_type;
@@ -5892,6 +5865,35 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages)
 }
 #endif
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+static int __meminit __zone_pcp_update(void *data)
+{
+       struct zone *zone = data;
+       int cpu;
+       unsigned long batch = zone_batchsize(zone), flags;
+
+       for_each_possible_cpu(cpu) {
+               struct per_cpu_pageset *pset;
+               struct per_cpu_pages *pcp;
+
+               pset = per_cpu_ptr(zone->pageset, cpu);
+               pcp = &pset->pcp;
+
+               local_irq_save(flags);
+               if (pcp->count > 0)
+                       free_pcppages_bulk(zone, pcp->count, pcp);
+               setup_pageset(pset, batch);
+               local_irq_restore(flags);
+       }
+       return 0;
+}
+
+void __meminit zone_pcp_update(struct zone *zone)
+{
+       stop_machine(__zone_pcp_update, zone, NULL);
+}
+#endif
+
 #ifdef CONFIG_MEMORY_HOTREMOVE
 void zone_pcp_reset(struct zone *zone)
 {