[S390] cio: Channel-path configure function.

Add a new attribute to the channel-path sysfs directory through which
channel-path configure operations can be triggered. Also listen for
hardware events requesting channel-path configure operations and
process them accordingly.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h
index 0db017b..f738d28 100644
--- a/include/asm-s390/cio.h
+++ b/include/asm-s390/cio.h
@@ -13,6 +13,7 @@
 #ifdef __KERNEL__
 
 #define LPM_ANYPATH 0xff
+#define __MAX_CSSID 0
 
 /*
  * subchannel status word