s390/uv: Make uv_convert_from_secure() a static function

It's not used outside of uv.c, so let's make it a static function.
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240508182955.358628-7-david@redhat.comSigned-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/include/asm/uv.h

@@ -484,7 +484,6 @@ int uv_pin_shared(unsigned long paddr);
 int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb);
 int gmap_destroy_page(struct gmap *gmap, unsigned long gaddr);
 int uv_destroy_owned_page(unsigned long paddr);
-int uv_convert_from_secure(unsigned long paddr);
 int uv_convert_owned_from_secure(unsigned long paddr);
 int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
 
@@ -503,11 +502,6 @@ static inline int uv_destroy_owned_page(unsigned long paddr)
 	return 0;
 }
 
-static inline int uv_convert_from_secure(unsigned long paddr)
-{
-	return 0;
-}
-
 static inline int uv_convert_owned_from_secure(unsigned long paddr)
 {
 	return 0;

arch/s390/kernel/uv.c

@@ -156,7 +156,7 @@ int uv_destroy_owned_page(unsigned long paddr)
  *
  * @paddr: Absolute host address of page to be exported
  */
-int uv_convert_from_secure(unsigned long paddr)
+static int uv_convert_from_secure(unsigned long paddr)
 {
 	struct uv_cb_cfs uvcb = {
 		.header.cmd = UVC_CMD_CONV_FROM_SEC_STOR,