mm: export prep_compound_page to mm hugetlb will need to get compound pages from bootmem to handle the case of them being greater than or equal to MAX_ORDER. Export the constructor function needed for this. Acked-by: Adam Litke <[email protected]> Signed-off-by: Andi Kleen <[email protected]> Signed-off-by: Nick Piggin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/internal.h b/mm/internal.h
index 858ad01..1f43f74 100644
--- a/mm/internal.h
+++ b/mm/internal.h

@@ -16,6 +16,8 @@
 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
 		unsigned long floor, unsigned long ceiling);
 
+extern void prep_compound_page(struct page *page, unsigned long order);
+
 static inline void set_page_count(struct page *page, int v)
 {
 	atomic_set(&page->_count, v);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e43aae1..eaa86671 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c

@@ -264,7 +264,7 @@
 	__free_pages_ok(page, compound_order(page));
 }
 
-static void prep_compound_page(struct page *page, unsigned long order)
+void prep_compound_page(struct page *page, unsigned long order)
 {
 	int i;
 	int nr_pages = 1 << order;