[S390] Cleanup struct _lowcore usage and defines.
Use asm offsets to make sure the offset defines to struct _lowcore and
its layout don't get out of sync.
Also add a BUILD_BUG_ON() which checks that the size of the structure
is sane.
And while being at it change those sites which use odd casts to access
the current lowcore. These should use S390_lowcore instead.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c
index 7a28a30..37df42a 100644
--- a/drivers/s390/cio/ccwreq.c
+++ b/drivers/s390/cio/ccwreq.c
@@ -224,8 +224,8 @@
*/
void ccw_request_handler(struct ccw_device *cdev)
{
+ struct irb *irb = (struct irb *)&S390_lowcore.irb;
struct ccw_request *req = &cdev->private->req;
- struct irb *irb = (struct irb *) __LC_IRB;
enum io_status status;
int rc = -EOPNOTSUPP;