[PATCH 1/2] mm: Export the alloc_demote_page() function

[Baolin Wang <baolin.wang@linux.alibaba.com>]

Export the alloc_demote_page() function to the head file as a
preparation to support page demotion for DAMON monitor.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 mm/internal.h | 1 +
 mm/vmscan.c   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/internal.h b/mm/internal.h
index deb9bda..99ea5fb 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -181,6 +181,7 @@ static inline void set_page_refcounted(struct page *page)
 extern int isolate_lru_page(struct page *page);
 extern void putback_lru_page(struct page *page);
 extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason);
+extern struct page *alloc_demote_page(struct page *page, unsigned long node);
 
 /*
  * in mm/rmap.c:
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f3162a5..bf38327 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1458,7 +1458,7 @@ static void page_check_dirty_writeback(struct page *page,
 		mapping->a_ops->is_dirty_writeback(page, dirty, writeback);
 }
 
-static struct page *alloc_demote_page(struct page *page, unsigned long node)
+struct page *alloc_demote_page(struct page *page, unsigned long node)
 {
 	struct migration_target_control mtc = {
 		/*
-- 
1.8.3.1