Fix build error with !CONFIG_MIGRATION
migrate_huge_page_move_mapping() is declared as "extern int ..."
in include/linux/migrate.h for !CONFIG_MIGRATION,
which causes the build error like below:
mm/mprotect.o: In function `migrate_huge_page_move_mapping':
mprotect.c:(.text+0x0): multiple definition of `migrate_huge_page_move_mapping'
mm/shmem.o:shmem.c:(.text+0x0): first defined here
mm/rmap.o: In function `migrate_huge_page_move_mapping':
rmap.c:(.text+0x0): multiple definition of `migrate_huge_page_move_mapping'
mm/shmem.o:shmem.c:(.text+0x0): first defined here
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3c1941e..085527f 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -50,7 +50,7 @@
static inline void migrate_page_copy(struct page *newpage,
struct page *page) {}
-extern int migrate_huge_page_move_mapping(struct address_space *mapping,
+static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
struct page *newpage, struct page *page)
{
return -ENOSYS;