[PATCH 1/4] mm/page_alloc: Split drain_local_pages()

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

From: Anna-Maria Gleixner <anna-maria@linutronix.de>

Splitting the functionality of drain_local_pages() into a separate
function. This is a preparatory work for introducing the static key
dependend locking mechanism.

No functional change.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 include/linux/gfp.h |  1 +
 mm/page_alloc.c     | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index fdab7de7490df..fcad3a07c9b04 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -557,6 +557,7 @@ extern void page_frag_free(void *addr);
 void page_alloc_init(void);
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
 void drain_all_pages(struct zone *zone);
+void drain_cpu_pages(unsigned int cpu, struct zone *zone);
 void drain_local_pages(struct zone *zone);
 
 void page_alloc_init_late(void);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c6ce20aaf80bb..cf120e0700035 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2713,6 +2713,14 @@ static void drain_pages(unsigned int cpu)
 	}
 }
 
+void drain_cpu_pages(unsigned int cpu, struct zone *zone)
+{
+	if (zone)
+		drain_pages_zone(cpu, zone);
+	else
+		drain_pages(cpu);
+}
+
 /*
  * Spill all of this CPU's per-cpu pages back into the buddy allocator.
  *
@@ -2723,10 +2731,7 @@ void drain_local_pages(struct zone *zone)
 {
 	int cpu = smp_processor_id();
 
-	if (zone)
-		drain_pages_zone(cpu, zone);
-	else
-		drain_pages(cpu);
+	drain_cpu_pages(cpu, zone);
 }
 
 static void drain_local_pages_wq(struct work_struct *work)
-- 
2.20.1