s390/sclp: single increment assignment control

Set a new option bit of the attach command to speed up memory
hotplug.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index b9c5522..dff8b94 100644 (file)
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -252,6 +252,7 @@ static int sclp_attach_storage(u8 id)
        if (!sccb)
                return -ENOMEM;
        sccb->header.length = PAGE_SIZE;
+       sccb->header.function_code = 0x40;
        rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
                                       SCLP_QUEUE_INTERVAL);
        if (rc)