s390/appldata_mem: do not use static data

Using static data for fields which are accessed by HW will fail if
the driver is build as a module (since this would be vmalloc'ed
memory). This Bug was revealed via
"s390: remove virt_to_phys implementation" - the old virt_to_phys
implementation would have translated the address but it was not
guaranteed that the memory was contiguous.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/appldata/appldata_mem.c

@@ -32,7 +32,7 @@
  * book:
  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  */
-static struct appldata_mem_data {
+struct appldata_mem_data {
 	u64 timestamp;
 	u32 sync_count_1;       /* after VM collected the record data, */
 	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
@@ -63,7 +63,7 @@ static struct appldata_mem_data {
 	u64 pgmajfault;		/* page faults (major only) */
 // <-- New in 2.6
 
-} __attribute__((packed)) appldata_mem_data;
+} __packed;
 
 
 /*
@@ -118,7 +118,6 @@ static struct appldata_ops ops = {
 	.record_nr = APPLDATA_RECORD_MEM_ID,
 	.size	   = sizeof(struct appldata_mem_data),
 	.callback  = &appldata_get_mem_data,
-	.data      = &appldata_mem_data,
 	.owner     = THIS_MODULE,
 	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
 };
@@ -131,7 +130,17 @@ static struct appldata_ops ops = {
  */
 static int __init appldata_mem_init(void)
 {
-	return appldata_register_ops(&ops);
+	int ret;
+
+	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
+	if (!ops.data)
+		return -ENOMEM;
+
+	ret = appldata_register_ops(&ops);
+	if (ret)
+		kfree(ops.data);
+
+	return ret;
 }
 
 /*
@@ -142,6 +151,7 @@ static int __init appldata_mem_init(void)
 static void __exit appldata_mem_exit(void)
 {
 	appldata_unregister_ops(&ops);
+	kfree(ops.data);
 }