mm/bootmem_info: export register_page_bootmem_memmap

If other mm code wants to use this function for early memmap inialization
(on the platforms that have it), it should be made available properly, not
just unconditionally in mm.h

Make this function available for such cases.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Frank van der Linden <[e-mail]>
Cc: Alexander Gordeev <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Dan Carpenter <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Joao Martins <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Roman Gushchin (Cruise) <[e-mail]>
Cc: Usama Arif <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Yu Zhao <[e-mail]>
Cc: Zi Yan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/powerpc/mm/init_64.c

···
 #include <linux/libfdt.h>
 #include <linux/memremap.h>
 #include <linux/memory.h>
+#include <linux/bootmem_info.h>
 
 #include <asm/pgalloc.h>
 #include <asm/page.h>
···
 }
 
 #endif
+
+#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 void register_page_bootmem_memmap(unsigned long section_nr,
 				  struct page *start_page, unsigned long size)
 {
 }
+#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
 
 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
 

include/linux/bootmem_info.h

···
 
 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
 void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
+void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
+				  unsigned long nr_pages);
 
 void get_page_bootmem(unsigned long info, struct page *page,
 		enum bootmem_type type);
···
 }
 #else
 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
+{
+}
+
+static inline void register_page_bootmem_memmap(unsigned long section_nr,
+		struct page *map, unsigned long nr_pages)
 {
 }
 

include/linux/mm.h

···
 }
 #endif
 
-void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
-				  unsigned long nr_pages);
-
 enum mf_flags {
 	MF_COUNT_INCREASED = 1 << 0,
 	MF_ACTION_REQUIRED = 1 << 1,