On s390, GCC does not like the string initialization in this case.  When
ValueToWrite is initialized this way, GCC tries to copy the entire string
into an ACPI_OBJECT instead of just the pointer (see the use in the call
to memcpy()).  So, move the init so GCC recognizes that ValueToWrite is
only a pointer, and not a whole string that needs to be moved.

Index: acpica-unix2-20200925/source/components/debugger/dbtest.c
===================================================================
--- acpica-unix2-20200925.orig/source/components/debugger/dbtest.c
+++ acpica-unix2-20200925/source/components/debugger/dbtest.c
@@ -719,9 +719,10 @@ AcpiDbTestStringType (
     ACPI_OBJECT             *Temp1 = NULL;
     ACPI_OBJECT             *Temp2 = NULL;
     ACPI_OBJECT             *Temp3 = NULL;
-    char                    *ValueToWrite = "Test String from AML Debugger";
+    char                    *ValueToWrite = NULL;
     ACPI_OBJECT             WriteValue;
     ACPI_STATUS             Status;
+    const char              *TestStr = "Test String from AML Debugger";
 
 
     /* Read the original value */
@@ -737,6 +738,9 @@ AcpiDbTestStringType (
 
     /* Write a new value */
 
+    ValueToWrite = AcpiOsAllocateZeroed(strlen(TestStr)+1);
+    strncpy(ValueToWrite, TestStr, strlen(TestStr)+1);
+
     WriteValue.Type = ACPI_TYPE_STRING;
     WriteValue.String.Length = strlen (ValueToWrite);
     WriteValue.String.Pointer = ValueToWrite;
@@ -790,6 +794,7 @@ Exit:
     if (Temp1) {AcpiOsFree (Temp1);}
     if (Temp2) {AcpiOsFree (Temp2);}
     if (Temp3) {AcpiOsFree (Temp3);}
+    if (ValueToWrite) {AcpiOsFree (ValueToWrite);}
     return (Status);
 }