diff --git a/Documentation/s390/zfcpdump.rst b/Documentation/s390/zfcpdump.rst
index 54e8e7caf7e76..a61de7aa8778f 100644
--- a/Documentation/s390/zfcpdump.rst
+++ b/Documentation/s390/zfcpdump.rst
@@ -46,5 +46,5 @@ initramfs with a user space application that writes the dump to a SCSI
 partition.
 
 For more information on how to use zfcpdump refer to the s390 'Using the Dump
-Tools book', which is available from
-http://www.ibm.com/developerworks/linux/linux390.
+Tools' book, which is available from IBM Knowledge Center:
+https://www.ibm.com/support/knowledgecenter/linuxonibm/liaaf/lnz_r_dt.html
diff --git a/arch/s390/appldata/appldata_mem.c b/arch/s390/appldata/appldata_mem.c
index e68136c3c23aa..21c3147bd92ad 100644
--- a/arch/s390/appldata/appldata_mem.c
+++ b/arch/s390/appldata/appldata_mem.c
@@ -29,10 +29,6 @@
  * the structure version (product ID, see appldata_base.c) needs to be changed
  * as well and all documentation and z/VM applications using it must be
  * updated.
- *
- * The record layout is documented in the Linux for zSeries Device Drivers
- * book:
- * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  */
 struct appldata_mem_data {
 	u64 timestamp;
diff --git a/arch/s390/appldata/appldata_net_sum.c b/arch/s390/appldata/appldata_net_sum.c
index 8bc14b0d1def0..59c282ca002f0 100644
--- a/arch/s390/appldata/appldata_net_sum.c
+++ b/arch/s390/appldata/appldata_net_sum.c
@@ -25,10 +25,6 @@
  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  * the structure version (product ID, see appldata_base.c) needs to be changed
  * as well and all documentation and z/VM applications using it must be updated.
- *
- * The record layout is documented in the Linux for zSeries Device Drivers
- * book:
- * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  */
 struct appldata_net_sum_data {
 	u64 timestamp;
diff --git a/arch/s390/appldata/appldata_os.c b/arch/s390/appldata/appldata_os.c
index 8bf46d7059573..5503217366ec0 100644
--- a/arch/s390/appldata/appldata_os.c
+++ b/arch/s390/appldata/appldata_os.c
@@ -32,10 +32,6 @@
  * the structure version (product ID, see appldata_base.c) needs to be changed
  * as well and all documentation and z/VM applications using it must be
  * updated.
- *
- * The record layout is documented in the Linux for zSeries Device Drivers
- * book:
- * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  */
 struct appldata_os_per_cpu {
 	u32 per_cpu_user;	/* timer ticks spent in user mode   */