s390/setup: diag 318: refactor struct

The diag 318 struct introduced in include/asm/diag.h can be
reused in KVM, so let's condense the version code fields in the
diag318_info struct for easier usage and simplify it until we
can determine how the data should be formatted.

Signed-off-by: Collin Walling <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Janosch Frank <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>

Author: collinwalling

arch/s390/include/asm/diag.h

@@ -298,10 +298,8 @@ struct diag26c_mac_resp {
 union diag318_info {
 	unsigned long val;
 	struct {
-		unsigned int cpnc : 8;
-		unsigned int cpvc_linux : 24;
-		unsigned char cpvc_distro[3];
-		unsigned char zero;
+		unsigned long cpnc : 8;
+		unsigned long cpvc : 56;
 	};
 };
 

arch/s390/kernel/setup.c

@@ -1021,8 +1021,7 @@ static void __init setup_control_program_code(void)
 {
 	union diag318_info diag318_info = {
 		.cpnc = CPNC_LINUX,
-		.cpvc_linux = 0,
-		.cpvc_distro = {0},
+		.cpvc = 0,
 	};
 
 	if (!sclp.has_diag318)