libnvdimm additions for 6.13

- typo fixes
 	- Clarify logic to remove potential NULL pointer math
 	- Remove dead code
 -----BEGIN PGP SIGNATURE-----
 
 iIoEABYKADIWIQSgX9xt+GwmrJEQ+euebuN7TNx1MQUCZ0DdohQcaXJhLndlaW55
 QGludGVsLmNvbQAKCRCebuN7TNx1MV2DAP0R7uiGQy/9SFXlj5Xs2LAZ7AmPl2nI
 2EjUho6+AoezCgD9EvHOie3IPEnU2+/0P/pUjp9h8LqWsw8cUlsfq+ie/AM=
 =Vsb3
 -----END PGP SIGNATURE-----

Merge tag 'libnvdimm-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull nvdimm and DAX updates from Ira Weiny:
 "Most represent minor cleanups and code removals. One patch fixes
  potential NULL pointer arithmetic which was benign because the offset
  of the member was 0. Nevertheless it should be cleaned up.

   - typo fixes

   - clarify logic to remove potential NULL pointer math

   - remove dead code"

* tag 'libnvdimm-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  dax: Remove an unused field in struct dax_operations
  dax: delete a stale directory pmem
  nvdimm: rectify the illogical code within nd_dax_probe()
  nvdimm: Correct some typos in comments

drivers/dax/pmem/Makefile

@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem.o
-obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem_core.o
-
-dax_pmem-y := pmem.o
-dax_pmem_core-y := core.o
-dax_pmem_compat-y := compat.o

drivers/dax/pmem/pmem.c

@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
-#include <linux/percpu-refcount.h>
-#include <linux/memremap.h>
-#include <linux/module.h>
-#include <linux/pfn_t.h>
-#include <linux/nd.h>
-#include "../bus.h"
-
-

drivers/nvdimm/dax_devs.c

@@ -106,12 +106,12 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
 
 	nvdimm_bus_lock(&ndns->dev);
 	nd_dax = nd_dax_alloc(nd_region);
-	nd_pfn = &nd_dax->nd_pfn;
-	dax_dev = nd_pfn_devinit(nd_pfn, ndns);
+	dax_dev = nd_dax_devinit(nd_dax, ndns);
 	nvdimm_bus_unlock(&ndns->dev);
 	if (!dax_dev)
 		return -ENOMEM;
 	pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
+	nd_pfn = &nd_dax->nd_pfn;
 	nd_pfn->pfn_sb = pfn_sb;
 	rc = nd_pfn_validate(nd_pfn, DAX_SIG);
 	dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");

drivers/nvdimm/nd.h

@@ -600,6 +600,13 @@ struct nd_dax *to_nd_dax(struct device *dev);
 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 bool is_nd_dax(const struct device *dev);
 struct device *nd_dax_create(struct nd_region *nd_region);
+static inline struct device *nd_dax_devinit(struct nd_dax *nd_dax,
+					    struct nd_namespace_common *ndns)
+{
+	if (!nd_dax)
+		return NULL;
+	return nd_pfn_devinit(&nd_dax->nd_pfn, ndns);
+}
 #else
 static inline int nd_dax_probe(struct device *dev,
 		struct nd_namespace_common *ndns)

drivers/nvdimm/nd_virtio.c

@@ -97,7 +97,7 @@ static int virtio_pmem_flush(struct nd_region *nd_region)
 		dev_info(&vdev->dev, "failed to send command to virtio pmem device\n");
 		err = -EIO;
 	} else {
-		/* A host repsonse results in "host_ack" getting called */
+		/* A host response results in "host_ack" getting called */
 		wait_event(req_data->host_acked, req_data->done);
 		err = le32_to_cpu(req_data->resp.ret);
 	}

drivers/nvdimm/pfn_devs.c

@@ -539,7 +539,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 
 	if (!nd_pfn->uuid) {
 		/*
-		 * When probing a namepace via nd_pfn_probe() the uuid
+		 * When probing a namespace via nd_pfn_probe() the uuid
 		 * is NULL (see: nd_pfn_devinit()) we init settings from
 		 * pfn_sb
 		 */

drivers/nvdimm/pmem.c

@@ -316,7 +316,7 @@ static long pmem_dax_direct_access(struct dax_device *dax_dev,
  * range, filesystem turns the normal pwrite to a dax_recovery_write.
  *
  * The recovery write consists of clearing media poison, clearing page
- * HWPoison bit, reenable page-wide read-write permission, flush the
+ * HWPoison bit, re-enable page-wide read-write permission, flush the
  * caches and finally write.  A competing pread thread will be held
  * off during the recovery process since data read back might not be
  * valid, and this is achieved by clearing the badblock records after

include/linux/dax.h

@@ -27,12 +27,6 @@ struct dax_operations {
 	 */
 	long (*direct_access)(struct dax_device *, pgoff_t, long,
 			enum dax_access_mode, void **, pfn_t *);
-	/*
-	 * Validate whether this device is usable as an fsdax backing
-	 * device.
-	 */
-	bool (*dax_supported)(struct dax_device *, struct block_device *, int,
-			sector_t, sector_t);
 	/* zero_page_range: required operation. Zero page range   */
 	int (*zero_page_range)(struct dax_device *, pgoff_t, size_t);
 	/*