s390: remove named saved segment support

Remove the support to create a z/VM named saved segment (NSS). This
feature is not supported since quite a while in favour of jump labels,
function tracing and (now) CPU alternatives. All of these features
require to write to the kernel text section which is not possible if
the kernel is contained within an NSS.

Given that memory savings are minimal if kernel images are shared and
in addition updates of shared images are painful, the NSS feature can
be removed.

Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 0 insertions, 36 deletions

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 8e622bb52f7a..310e59e6eb4b 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -279,8 +279,6 @@ static __init enum ipl_type get_ipl_type(void)
 {
 	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 
-	if (ipl_flags & IPL_NSS_VALID)
-		return IPL_TYPE_NSS;
 	if (!(ipl_flags & IPL_DEVNO_VALID))
 		return IPL_TYPE_UNKNOWN;
 	if (!(ipl_flags & IPL_PARMBLOCK_VALID))
@@ -533,22 +531,6 @@ static struct attribute_group ipl_ccw_attr_group_lpar = {
 	.attrs = ipl_ccw_attrs_lpar
 };
 
-/* NSS ipl device attributes */
-
-DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
-
-static struct attribute *ipl_nss_attrs[] = {
-	&sys_ipl_type_attr.attr,
-	&sys_ipl_nss_name_attr.attr,
-	&sys_ipl_ccw_loadparm_attr.attr,
-	&sys_ipl_vm_parm_attr.attr,
-	NULL,
-};
-
-static struct attribute_group ipl_nss_attr_group = {
-	.attrs = ipl_nss_attrs,
-};
-
 /* UNKNOWN ipl device attributes */
 
 static struct attribute *ipl_unknown_attrs[] = {
@@ -598,9 +580,6 @@ static int __init ipl_init(void)
 	case IPL_TYPE_FCP_DUMP:
 		rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 		break;
-	case IPL_TYPE_NSS:
-		rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
-		break;
 	default:
 		rc = sysfs_create_group(&ipl_kset->kobj,
 					&ipl_unknown_attr_group);
@@ -1172,18 +1151,6 @@ static int __init reipl_nss_init(void)
 		return rc;
 
 	reipl_block_ccw_init(reipl_block_nss);
-	if (ipl_info.type == IPL_TYPE_NSS) {
-		memset(reipl_block_nss->ipl_info.ccw.nss_name,
-			' ', NSS_NAME_SIZE);
-		memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
-			kernel_nss_name, strlen(kernel_nss_name));
-		ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
-		reipl_block_nss->ipl_info.ccw.vm_flags |=
-			DIAG308_VM_FLAGS_NSS_VALID;
-
-		reipl_block_ccw_fill_parms(reipl_block_nss);
-	}
-
 	reipl_capabilities |= IPL_TYPE_NSS;
 	return 0;
 }
@@ -1971,9 +1938,6 @@ void __init setup_ipl(void)
 		ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
 		break;
 	case IPL_TYPE_NSS:
-		strncpy(ipl_info.data.nss.name, kernel_nss_name,
-			sizeof(ipl_info.data.nss.name));
-		break;
 	case IPL_TYPE_UNKNOWN:
 		/* We have no info to copy */
 		break;