[to-be-updated] mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove.patch removed from -mm tree

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The patch titled
     Subject: mm, hmm: use devm semantics for hmm_devmem_{add, remove}
has been removed from the -mm tree.  Its filename was
     mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm, hmm: use devm semantics for hmm_devmem_{add, remove}

devm semantics arrange for resources to be torn down when
device-driver-probe fails or when device-driver-release completes. 
Similar to devm_memremap_pages() there is no need to support an explicit
remove operation when the users properly adhere to devm semantics.

Link: http://lkml.kernel.org/r/152694212973.5484.9009059511258430529.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: "Jérôme Glisse" <jglisse@xxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 Documentation/vm/hmm.rst |    1 
 include/linux/hmm.h      |    4 -
 mm/hmm.c                 |  127 +++++++++----------------------------
 3 files changed, 32 insertions(+), 100 deletions(-)

diff -puN Documentation/vm/hmm.rst~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove Documentation/vm/hmm.rst
--- a/Documentation/vm/hmm.rst~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove
+++ a/Documentation/vm/hmm.rst
@@ -277,7 +277,6 @@ region needing a struct page. This is of
  struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
                                    struct device *device,
                                    unsigned long size);
- void hmm_devmem_remove(struct hmm_devmem *devmem);
 
 The hmm_devmem_ops is where most of the important things are::
 
diff -puN include/linux/hmm.h~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove include/linux/hmm.h
--- a/include/linux/hmm.h~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove
+++ a/include/linux/hmm.h
@@ -499,8 +499,7 @@ struct hmm_devmem {
  * enough and allocate struct page for it.
  *
  * The device driver can wrap the hmm_devmem struct inside a private device
- * driver struct. The device driver must call hmm_devmem_remove() before the
- * device goes away and before freeing the hmm_devmem struct memory.
+ * driver struct.
  */
 struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
 				  struct device *device,
@@ -508,7 +507,6 @@ struct hmm_devmem *hmm_devmem_add(const
 struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
 					   struct device *device,
 					   struct resource *res);
-void hmm_devmem_remove(struct hmm_devmem *devmem);
 
 /*
  * hmm_devmem_page_set_drvdata - set per-page driver data field
diff -puN mm/hmm.c~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove mm/hmm.c
--- a/mm/hmm.c~mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove
+++ a/mm/hmm.c
@@ -984,15 +984,17 @@ static void hmm_devmem_radix_release(str
 	mutex_unlock(&hmm_devmem_lock);
 }
 
-static void hmm_devmem_release(struct device *dev, void *data)
+static void hmm_devmem_release(void *data)
 {
 	struct hmm_devmem *devmem = data;
+	struct device *dev = devmem->device;
 	struct resource *resource = devmem->resource;
+	struct dev_pagemap *pgmap = &devmem->pagemap;
 	unsigned long start_pfn, npages;
 	struct zone *zone;
 	struct page *page;
 
-	if (percpu_ref_tryget_live(&devmem->ref)) {
+	if (pgmap->registered && percpu_ref_tryget_live(&devmem->ref)) {
 		dev_WARN(dev, "%s: page mapping is still live!\n", __func__);
 		percpu_ref_put(&devmem->ref);
 	}
@@ -1120,19 +1122,6 @@ error:
 	return ret;
 }
 
-static int hmm_devmem_match(struct device *dev, void *data, void *match_data)
-{
-	struct hmm_devmem *devmem = data;
-
-	return devmem->resource == match_data;
-}
-
-static void hmm_devmem_pages_remove(struct hmm_devmem *devmem)
-{
-	devres_release(devmem->device, &hmm_devmem_release,
-		       &hmm_devmem_match, devmem->resource);
-}
-
 /*
  * hmm_devmem_add() - hotplug ZONE_DEVICE memory for device memory
  *
@@ -1160,8 +1149,7 @@ struct hmm_devmem *hmm_devmem_add(const
 
 	dev_pagemap_get_ops();
 
-	devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem),
-				   GFP_KERNEL, dev_to_node(device));
+	devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
 	if (!devmem)
 		return ERR_PTR(-ENOMEM);
 
@@ -1175,11 +1163,11 @@ struct hmm_devmem *hmm_devmem_add(const
 	ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
 			      0, GFP_KERNEL);
 	if (ret)
-		goto error_percpu_ref;
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit, &devmem->ref);
 	if (ret)
-		goto error_devm_add_action;
+		return ERR_PTR(ret);
 
 	size = ALIGN(size, PA_SECTION_SIZE);
 	addr = min((unsigned long)iomem_resource.end,
@@ -1199,16 +1187,12 @@ struct hmm_devmem *hmm_devmem_add(const
 
 		devmem->resource = devm_request_mem_region(device, addr, size,
 							   dev_name(device));
-		if (!devmem->resource) {
-			ret = -ENOMEM;
-			goto error_no_resource;
-		}
+		if (!devmem->resource)
+			return ERR_PTR(-ENOMEM);
 		break;
 	}
-	if (!devmem->resource) {
-		ret = -ERANGE;
-		goto error_no_resource;
-	}
+	if (!devmem->resource)
+		return ERR_PTR(-ERANGE);
 
 	devmem->resource->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
 	devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
@@ -1217,28 +1201,18 @@ struct hmm_devmem *hmm_devmem_add(const
 
 	ret = hmm_devmem_pages_create(devmem);
 	if (ret)
-		goto error_pages;
+		return ERR_PTR(ret);
 
-	devres_add(device, devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem);
+	if (ret)
+		return ERR_PTR(ret);
+	devmem->pagemap.registered = true;
 
-	ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref);
-	if (ret) {
-		hmm_devmem_remove(devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_kill, &devmem->ref);
+	if (ret)
 		return ERR_PTR(ret);
-	}
 
 	return devmem;
-
-error_pages:
-	devm_release_mem_region(device, devmem->resource->start,
-				resource_size(devmem->resource));
-error_no_resource:
-error_devm_add_action:
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-error_percpu_ref:
-	devres_free(devmem);
-	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(hmm_devmem_add);
 
@@ -1254,8 +1228,7 @@ struct hmm_devmem *hmm_devmem_add_resour
 
 	dev_pagemap_get_ops();
 
-	devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem),
-				   GFP_KERNEL, dev_to_node(device));
+	devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
 	if (!devmem)
 		return ERR_PTR(-ENOMEM);
 
@@ -1269,12 +1242,12 @@ struct hmm_devmem *hmm_devmem_add_resour
 	ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
 			      0, GFP_KERNEL);
 	if (ret)
-		goto error_percpu_ref;
+		return ERR_PTR(ret);
 
-	ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit,
+			&devmem->ref);
 	if (ret)
-		goto error_devm_add_action;
-
+		return ERR_PTR(ret);
 
 	devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
 	devmem->pfn_last = devmem->pfn_first +
@@ -1282,60 +1255,22 @@ struct hmm_devmem *hmm_devmem_add_resour
 
 	ret = hmm_devmem_pages_create(devmem);
 	if (ret)
-		goto error_devm_add_action;
+		return ERR_PTR(ret);
 
-	devres_add(device, devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem);
+	if (ret)
+		return ERR_PTR(ret);
+	devmem->pagemap.registered = true;
 
-	ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref);
-	if (ret) {
-		hmm_devmem_remove(devmem);
+	ret = devm_add_action_or_reset(device, hmm_devmem_ref_kill, &devmem->ref);
+	if (ret)
 		return ERR_PTR(ret);
-	}
 
 	return devmem;
-
-error_devm_add_action:
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-error_percpu_ref:
-	devres_free(devmem);
-	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(hmm_devmem_add_resource);
 
 /*
- * hmm_devmem_remove() - remove device memory (kill and free ZONE_DEVICE)
- *
- * @devmem: hmm_devmem struct use to track and manage the ZONE_DEVICE memory
- *
- * This will hot-unplug memory that was hotplugged by hmm_devmem_add on behalf
- * of the device driver. It will free struct page and remove the resource that
- * reserved the physical address range for this device memory.
- */
-void hmm_devmem_remove(struct hmm_devmem *devmem)
-{
-	resource_size_t start, size;
-	struct device *device;
-	bool cdm = false;
-
-	if (!devmem)
-		return;
-
-	device = devmem->device;
-	start = devmem->resource->start;
-	size = resource_size(devmem->resource);
-
-	cdm = devmem->resource->desc == IORES_DESC_DEVICE_PUBLIC_MEMORY;
-	hmm_devmem_ref_kill(&devmem->ref);
-	hmm_devmem_ref_exit(&devmem->ref);
-	hmm_devmem_pages_remove(devmem);
-
-	if (!cdm)
-		devm_release_mem_region(device, start, size);
-}
-EXPORT_SYMBOL(hmm_devmem_remove);
-
-/*
  * A device driver that wants to handle multiple devices memory through a
  * single fake device can use hmm_device to do so. This is purely a helper
  * and it is not needed to make use of any HMM functionality.
_

Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are

mm-hmm-replace-hmm_devmem_pages_create-with-devm_memremap_pages.patch
mm-hmm-mark-hmm_devmem_add-add_resource-export_symbol_gpl.patch

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