[RFC v3 1/7] mm/madvise: Export madvise_common() to mm internal code

[SeongJae Park <sjpark@amazon.com>]

From: SeongJae Park <sjpark@amazon.de>

This commit exports ``madvise_common()`` to ``mm/`` code for future
reuse.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 mm/internal.h | 4 ++++
 mm/madvise.c  | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/internal.h b/mm/internal.h
index 3cf20ab3ca01..dcdfe00e02ff 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -576,4 +576,8 @@ static inline bool is_migrate_highatomic_page(struct page *page)
 
 void setup_zone_pageset(struct zone *zone);
 extern struct page *alloc_new_node_page(struct page *page, unsigned long node);
+
+
+int madvise_common(struct task_struct *task, struct mm_struct *mm,
+			unsigned long start, size_t len_in, int behavior);
 #endif	/* __MM_INTERNAL_H */
diff --git a/mm/madvise.c b/mm/madvise.c
index 0c901de531e4..4fa9dfc770bc 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1005,7 +1005,7 @@ madvise_behavior_valid(int behavior)
  * @task could be a zombie leader if it calls sys_exit so accessing mm_struct
  * via task->mm is prohibited. Please use @mm instead of task->mm.
  */
-static int madvise_common(struct task_struct *task, struct mm_struct *mm,
+int madvise_common(struct task_struct *task, struct mm_struct *mm,
 			unsigned long start, size_t len_in, int behavior)
 {
 	unsigned long end, tmp;
@@ -1103,6 +1103,7 @@ static int madvise_common(struct task_struct *task, struct mm_struct *mm,
 
 	return error;
 }
+EXPORT_SYMBOL_GPL(madvise_common);
 
 /*
  * The madvise(2) system call.
-- 
2.17.1