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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/s390/appldata/appldata_os.c
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@@ -32,10 +32,6 @@
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  * the structure version (product ID, see appldata_base.c) needs to be changed
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  * as well and all documentation and z/VM applications using it must be
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  * updated.
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- *
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- * The record layout is documented in the Linux for zSeries Device Drivers
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- * book:
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- * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
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  */
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 struct appldata_os_per_cpu {
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 	u32 per_cpu_user;	/* timer ticks spent in user mode   */
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@@ -75,7 +71,7 @@
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 				   (waiting for I/O)               */
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 	/* per cpu data */
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-	struct appldata_os_per_cpu os_cpu[0];
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+	struct appldata_os_per_cpu os_cpu[];
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 } __attribute__((packed));
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 static struct appldata_os_data *appldata_os_data;
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@@ -133,8 +129,7 @@
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 	os_data->nr_cpus = j;
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-	new_size = sizeof(struct appldata_os_data) +
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-		   (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu));
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+	new_size = struct_size(os_data, os_cpu, os_data->nr_cpus);
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 	if (ops.size != new_size) {
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 		if (ops.active) {
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 			rc = appldata_diag(APPLDATA_RECORD_OS_ID,
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@@ -169,8 +164,7 @@
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 {
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 	int rc, max_size;
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-	max_size = sizeof(struct appldata_os_data) +
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-		   (num_possible_cpus() * sizeof(struct appldata_os_per_cpu));
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+	max_size = struct_size(appldata_os_data, os_cpu, num_possible_cpus());
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 	if (max_size > APPLDATA_MAX_REC_SIZE) {
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 		pr_err("Maximum OS record size %i exceeds the maximum "
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 		       "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE);