[PATCH] fs: add macro when api not used

[lingfuyi <lingfuyi@xxxxxxx>]

when CONFIG_ELF_CORE not defined but dump_emit_page only used in
dump_user_range(),will case some error like this:

fs/coredump.c:841:12: error: ‘dump_emit_page’ defined but not used
[-Werror=unused-function]
static int dump_emit_page(struct coredump_params *cprm, struct page *page)

Signed-off-by: lingfuyi <lingfuyi@xxxxxxx>
---
 fs/coredump.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/coredump.c b/fs/coredump.c
index de78bde2991b..95390a73b912 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -838,6 +838,7 @@ static int __dump_skip(struct coredump_params *cprm, size_t nr)
 	}
 }
 
+#ifdef CONFIG_ELF_CORE
 static int dump_emit_page(struct coredump_params *cprm, struct page *page)
 {
 	struct bio_vec bvec = {
@@ -870,6 +871,7 @@ static int dump_emit_page(struct coredump_params *cprm, struct page *page)
 
 	return 1;
 }
+#endif
 
 int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
 {
-- 
2.20.1