[PATCH] s390/mem_detect: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD)

[Joe Perches <joe@xxxxxxxxxxx>]

IS_ENABLED should generally use CONFIG_ prefaced symbols and
it doesn't appear as if there is a BLK_DEV_INITRD define.

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---
 arch/s390/boot/mem_detect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
index 4cb771ba13fa..5d316fe40480 100644
--- a/arch/s390/boot/mem_detect.c
+++ b/arch/s390/boot/mem_detect.c
@@ -25,7 +25,7 @@ static void *mem_detect_alloc_extended(void)
 {
 	unsigned long offset = ALIGN(mem_safe_offset(), sizeof(u64));
 
-	if (IS_ENABLED(BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
 	    INITRD_START < offset + ENTRIES_EXTENDED_MAX)
 		offset = ALIGN(INITRD_START + INITRD_SIZE, sizeof(u64));