Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:
 "Two regression fixes, two bug fixes for older issues, two fixes for
  new functionality added this cycle that have userspace ABI concerns,
  and a small cleanup. These have appeared in a linux-next release and
  have a build success report from the 0day robot.

   * The 4.16 rework of altmap handling led to some configurations
     leaking page table allocations due to freeing from the altmap
     reservation rather than the page allocator.

     The impact without the fix is leaked memory and a WARN() message
     when tearing down libnvdimm namespaces. The rework also missed a
     place where error handling code needed to be removed that can lead
     to a crash if devm_memremap_pages() fails.

   * acpi_map_pxm_to_node() had a latent bug whereby it could
     misidentify the closest online node to a given proximity domain.

   * Block integrity handling was reworked several kernels back to allow
     calling add_disk() after setting up the integrity profile.

     The nd_btt and nd_blk drivers are just now catching up to fix
     automatic partition detection at driver load time.

   * The new peristence_domain attribute, a platform indicator of
     whether cpu caches are powerfail protected for example, is meant to
     be a single value enum and not a set of flags.

     This oversight was caught while reviewing new userspace code in
     libndctl to communicate the attribute.

     Fix this new enabling up so that we are not stuck with an unwanted
     userspace ABI"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm, nfit: fix persistence domain reporting
  libnvdimm, region: hide persistence_domain when unknown
  acpi, numa: fix pxm to online numa node associations
  x86, memremap: fix altmap accounting at free
  libnvdimm: remove redundant assignment to pointer 'dev'
  libnvdimm, {btt, blk}: do integrity setup before add_disk()
  kernel/memremap: Remove stale devres_free() call

6 files changed, 29 insertions, 16 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index bbe48ad20886..eb09ef55c38a 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2675,10 +2675,14 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
 	else
 		ndr_desc->numa_node = NUMA_NO_NODE;
 
-	if(acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_CACHE_FLUSH)
+	/*
+	 * Persistence domain bits are hierarchical, if
+	 * ACPI_NFIT_CAPABILITY_CACHE_FLUSH is set then
+	 * ACPI_NFIT_CAPABILITY_MEM_FLUSH is implied.
+	 */
+	if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_CACHE_FLUSH)
 		set_bit(ND_REGION_PERSIST_CACHE, &ndr_desc->flags);
-
-	if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_MEM_FLUSH)
+	else if (acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_MEM_FLUSH)
 		set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc->flags);
 
 	list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 8ccaae3550d2..85167603b9c9 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -103,25 +103,27 @@ int acpi_map_pxm_to_node(int pxm)
  */
 int acpi_map_pxm_to_online_node(int pxm)
 {
-	int node, n, dist, min_dist;
+	int node, min_node;
 
 	node = acpi_map_pxm_to_node(pxm);
 
 	if (node == NUMA_NO_NODE)
 		node = 0;
 
+	min_node = node;
 	if (!node_online(node)) {
-		min_dist = INT_MAX;
+		int min_dist = INT_MAX, dist, n;
+
 		for_each_online_node(n) {
 			dist = node_distance(node, n);
 			if (dist < min_dist) {
 				min_dist = dist;
-				node = n;
+				min_node = n;
 			}
 		}
 	}
 
-	return node;
+	return min_node;
 }
 EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
 
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 345acca576b3..1bd7b3734751 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -278,8 +278,6 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
 	disk->queue		= q;
 	disk->flags		= GENHD_FL_EXT_DEVT;
 	nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
-	set_capacity(disk, 0);
-	device_add_disk(dev, disk);
 
 	if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk))
 		return -ENOMEM;
@@ -292,6 +290,7 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
 	}
 
 	set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
+	device_add_disk(dev, disk);
 	revalidate_disk(disk);
 	return 0;
 }
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 2ef544f10ec8..4b95ac513de2 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1545,8 +1545,6 @@ static int btt_blk_init(struct btt *btt)
 	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, btt->btt_queue);
 	btt->btt_queue->queuedata = btt;
 
-	set_capacity(btt->btt_disk, 0);
-	device_add_disk(&btt->nd_btt->dev, btt->btt_disk);
 	if (btt_meta_size(btt)) {
 		int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));
 
@@ -1558,6 +1556,7 @@ static int btt_blk_init(struct btt *btt)
 		}
 	}
 	set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
+	device_add_disk(&btt->nd_btt->dev, btt->btt_disk);
 	btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
 	revalidate_disk(btt->btt_disk);
 
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index f5c4e8c6e29d..2f4d18752c97 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -304,7 +304,7 @@ static const struct attribute_group *nd_pfn_attribute_groups[] = {
 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 		struct nd_namespace_common *ndns)
 {
-	struct device *dev = &nd_pfn->dev;
+	struct device *dev;
 
 	if (!nd_pfn)
 		return NULL;
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index e6d01911e092..1593e1806b16 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -532,11 +532,13 @@ static ssize_t persistence_domain_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct nd_region *nd_region = to_nd_region(dev);
-	unsigned long flags = nd_region->flags;
 
-	return sprintf(buf, "%s%s\n",
-			flags & BIT(ND_REGION_PERSIST_CACHE) ? "cpu_cache " : "",
-			flags & BIT(ND_REGION_PERSIST_MEMCTRL) ? "memory_controller " : "");
+	if (test_bit(ND_REGION_PERSIST_CACHE, &nd_region->flags))
+		return sprintf(buf, "cpu_cache\n");
+	else if (test_bit(ND_REGION_PERSIST_MEMCTRL, &nd_region->flags))
+		return sprintf(buf, "memory_controller\n");
+	else
+		return sprintf(buf, "\n");
 }
 static DEVICE_ATTR_RO(persistence_domain);
 
@@ -593,6 +595,13 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
 			return 0;
 	}
 
+	if (a == &dev_attr_persistence_domain.attr) {
+		if ((nd_region->flags & (BIT(ND_REGION_PERSIST_CACHE)
+					| BIT(ND_REGION_PERSIST_MEMCTRL))) == 0)
+			return 0;
+		return a->mode;
+	}
+
 	if (a != &dev_attr_set_cookie.attr
 			&& a != &dev_attr_available_size.attr)
 		return a->mode;