libnvdimm updates for v6.7

- updates to deprecated and changed interfaces
 - bug/kdoc fixes
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Merge tag 'libnvdimm-for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Ira Weiny:

 - updates to deprecated and changed interfaces

 - bug/kdoc fixes

* tag 'libnvdimm-for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm: remove kernel-doc warnings:
  testing: nvdimm: make struct class structures constant
  libnvdimm: Annotate struct nd_region with __counted_by
  nd_btt: Make BTT lanes preemptible
  libnvdimm/of_pmem: Use devm_kstrdup instead of kstrdup and check its return value
  dax: refactor deprecated strncpy

drivers/dax/bus.c

@@ -103,7 +103,7 @@ static ssize_t do_id_store(struct device_driver *drv, const char *buf,
 		if (action == ID_ADD) {
 			dax_id = kzalloc(sizeof(*dax_id), GFP_KERNEL);
 			if (dax_id) {
-				strncpy(dax_id->dev_name, buf, DAX_NAME_LEN);
+				strscpy(dax_id->dev_name, buf, DAX_NAME_LEN);
 				list_add(&dax_id->list, &dax_drv->ids);
 			} else
 				rc = -ENOMEM;

drivers/nvdimm/badrange.c

@@ -257,9 +257,9 @@ static void badblocks_populate(struct badrange *badrange,
 
 /**
  * nvdimm_badblocks_populate() - Convert a list of badranges to badblocks
- * @region: parent region of the range to interrogate
+ * @nd_region: parent region of the range to interrogate
  * @bb: badblocks instance to populate
- * @res: resource range to consider
+ * @range: resource range to consider
  *
  * The badrange list generated during bus initialization may contain
  * multiple, possibly overlapping physical address ranges.  Compare each

drivers/nvdimm/nd.h

@@ -422,7 +422,7 @@ struct nd_region {
 	struct nd_interleave_set *nd_set;
 	struct nd_percpu_lane __percpu *lane;
 	int (*flush)(struct nd_region *nd_region, struct bio *bio);
-	struct nd_mapping mapping[];
+	struct nd_mapping mapping[] __counted_by(ndr_mappings);
 };
 
 static inline bool nsl_validate_nlabel(struct nd_region *nd_region,

drivers/nvdimm/of_pmem.c

@@ -30,7 +30,13 @@ static int of_pmem_region_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
+	priv->bus_desc.provider_name = devm_kstrdup(&pdev->dev, pdev->name,
+							GFP_KERNEL);
+	if (!priv->bus_desc.provider_name) {
+		kfree(priv);
+		return -ENOMEM;
+	}
+
 	priv->bus_desc.module = THIS_MODULE;
 	priv->bus_desc.of_node = np;
 

drivers/nvdimm/region_devs.c

@@ -939,7 +939,8 @@ unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
 {
 	unsigned int cpu, lane;
 
-	cpu = get_cpu();
+	migrate_disable();
+	cpu = smp_processor_id();
 	if (nd_region->num_lanes < nr_cpu_ids) {
 		struct nd_percpu_lane *ndl_lock, *ndl_count;
 
@@ -958,16 +959,15 @@ EXPORT_SYMBOL(nd_region_acquire_lane);
 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
 {
 	if (nd_region->num_lanes < nr_cpu_ids) {
-		unsigned int cpu = get_cpu();
+		unsigned int cpu = smp_processor_id();
 		struct nd_percpu_lane *ndl_lock, *ndl_count;
 
 		ndl_count = per_cpu_ptr(nd_region->lane, cpu);
 		ndl_lock = per_cpu_ptr(nd_region->lane, lane);
 		if (--ndl_count->count == 0)
 			spin_unlock(&ndl_lock->lock);
-		put_cpu();
 	}
-	put_cpu();
+	migrate_enable();
 }
 EXPORT_SYMBOL(nd_region_release_lane);
 
@@ -1028,6 +1028,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
 
 	if (!nd_region)
 		return NULL;
+	nd_region->ndr_mappings = ndr_desc->num_mappings;
 	/* CXL pre-assigns memregion ids before creating nvdimm regions */
 	if (test_bit(ND_REGION_CXL, &ndr_desc->flags)) {
 		nd_region->id = ndr_desc->memregion;
@@ -1062,7 +1063,6 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
 
 		get_device(&nvdimm->dev);
 	}
-	nd_region->ndr_mappings = ndr_desc->num_mappings;
 	nd_region->provider_data = ndr_desc->provider_data;
 	nd_region->nd_set = ndr_desc->nd_set;
 	nd_region->num_lanes = ndr_desc->num_lanes;

tools/testing/nvdimm/test/ndtest.c

@@ -38,7 +38,11 @@ enum {
 
 static DEFINE_SPINLOCK(ndtest_lock);
 static struct ndtest_priv *instances[NUM_INSTANCES];
-static struct class *ndtest_dimm_class;
+
+static const struct class ndtest_dimm_class = {
+	.name = "nfit_test_dimm",
+};
+
 static struct gen_pool *ndtest_pool;
 
 static struct ndtest_dimm dimm_group1[] = {
@@ -737,7 +741,7 @@ static int ndtest_dimm_register(struct ndtest_priv *priv,
 		return -ENXIO;
 	}
 
-	dimm->dev = device_create_with_groups(ndtest_dimm_class,
+	dimm->dev = device_create_with_groups(&ndtest_dimm_class,
 					     &priv->pdev.dev,
 					     0, dimm, dimm_attribute_groups,
 					     "test_dimm%d", id);
@@ -906,8 +910,7 @@ static void cleanup_devices(void)
 		gen_pool_destroy(ndtest_pool);
 
 
-	if (ndtest_dimm_class)
+	class_unregister(&ndtest_dimm_class);
-		class_destroy(ndtest_dimm_class);
 }
 
 static __init int ndtest_init(void)
@@ -921,11 +924,9 @@ static __init int ndtest_init(void)
 
 	nfit_test_setup(ndtest_resource_lookup, NULL);
 
-	ndtest_dimm_class = class_create("nfit_test_dimm");
+	rc = class_regster(&ndtest_dimm_class);
-	if (IS_ERR(ndtest_dimm_class)) {
+	if (rc)
-		rc = PTR_ERR(ndtest_dimm_class);
 		goto err_register;
-	}
 
 	ndtest_pool = gen_pool_create(ilog2(SZ_4M), NUMA_NO_NODE);
 	if (!ndtest_pool) {

tools/testing/nvdimm/test/nfit.c

@@ -1712,7 +1712,9 @@ static void put_dimms(void *data)
 			device_unregister(t->dimm_dev[i]);
 }
 
-static struct class *nfit_test_dimm;
+static const struct class nfit_test_dimm = {
+	.name = "nfit_test_dimm",
+};
 
 static int dimm_name_to_id(struct device *dev)
 {
@@ -1830,7 +1832,7 @@ static int nfit_test_dimm_init(struct nfit_test *t)
 	if (devm_add_action_or_reset(&t->pdev.dev, put_dimms, t))
 		return -ENOMEM;
 	for (i = 0; i < t->num_dcr; i++) {
-		t->dimm_dev[i] = device_create_with_groups(nfit_test_dimm,
+		t->dimm_dev[i] = device_create_with_groups(&nfit_test_dimm,
 				&t->pdev.dev, 0, NULL,
 				nfit_test_dimm_attribute_groups,
 				"test_dimm%d", i + t->dcr_idx);
@@ -3276,11 +3278,9 @@ static __init int nfit_test_init(void)
 	if (!nfit_wq)
 		return -ENOMEM;
 
-	nfit_test_dimm = class_create("nfit_test_dimm");
+	rc = class_register(&nfit_test_dimm);
-	if (IS_ERR(nfit_test_dimm)) {
+	if (rc)
-		rc = PTR_ERR(nfit_test_dimm);
 		goto err_register;
-	}
 
 	nfit_pool = gen_pool_create(ilog2(SZ_4M), NUMA_NO_NODE);
 	if (!nfit_pool) {
@@ -3377,7 +3377,7 @@ static __exit void nfit_test_exit(void)
 
 	for (i = 0; i < NUM_NFITS; i++)
 		put_device(&instances[i]->pdev.dev);
-	class_destroy(nfit_test_dimm);
+	class_unregister(&nfit_test_dimm);
 }
 
 module_init(nfit_test_init);