Commit 264015f8 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'libnvdimm-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 

Pull libnvdimm updates from Dan Williams:
 "Outside of the new ACPI-NFIT hot-add support this pull request is more
  notable for what it does not contain, than what it does.  There were a
  handful of development topics this cycle, dax get_user_pages, dax
  fsync, and raw block dax, that need more more iteration and will wait
  for 4.5.

  The patches to make devm and the pmem driver NUMA aware have been in
  -next for several weeks.  The hot-add support has not, but is
  contained to the NFIT driver and is passing unit tests.  The coredump
  support is straightforward and was looked over by Jeff.  All of it has
  received a 0day build success notification across 107 configs.

  Summary:

   - Add support for the ACPI 6.0 NFIT hot add mechanism to process
     updates of the NFIT at runtime.

   - Teach the coredump implementation how to filter out DAX mappings.

   - Introduce NUMA hints for allocations made by the pmem driver, and
     as a side effect all devm allocations now hint their NUMA node by
     default"

* tag 'libnvdimm-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  coredump: add DAX filtering for FDPIC ELF coredumps
  coredump: add DAX filtering for ELF coredumps
  acpi: nfit: Add support for hot-add
  nfit: in acpi_nfit_init, break on a 0-length table
  pmem, memremap: convert to numa aware allocations
  devm_memremap_pages: use numa_mem_id
  devm: make allocations numa aware by default
  devm_memremap: convert to return ERR_PTR
  devm_memunmap: use devres_release()
  pmem: kill memremap_pmem()
  x86, mm: quiet arch_add_memory()
parents d55fc378 ab27a8d0

Documentation/filesystems/proc.txt

+12 −10
Original line number Diff line number Diff line
@@ -1605,16 +1605,16 @@ Documentation/accounting. 
---------------------------------------------------------------

When a process is dumped, all anonymous memory is written to a core file as

long as the size of the core file isn't limited. But sometimes we don't want

to dump some memory segments, for example, huge shared memory. Conversely,

sometimes we want to save file-backed memory segments into a core file, not

only the individual files.

to dump some memory segments, for example, huge shared memory or DAX.

Conversely, sometimes we want to save file-backed memory segments into a core

file, not only the individual files.



/proc/<pid>/coredump_filter allows you to customize which memory segments

will be dumped when the <pid> process is dumped. coredump_filter is a bitmask

of memory types. If a bit of the bitmask is set, memory segments of the

corresponding memory type are dumped, otherwise they are not dumped.



The following 7 memory types are supported:

The following 9 memory types are supported:

  - (bit 0) anonymous private memory

  - (bit 1) anonymous shared memory

  - (bit 2) file-backed private memory
@@ -1623,20 +1623,22 @@ The following 7 memory types are supported: 
            effective only if the bit 2 is cleared)

  - (bit 5) hugetlb private memory

  - (bit 6) hugetlb shared memory

  - (bit 7) DAX private memory

  - (bit 8) DAX shared memory



  Note that MMIO pages such as frame buffer are never dumped and vDSO pages

  are always dumped regardless of the bitmask status.



  Note bit 0-4 doesn't effect any hugetlb memory. hugetlb memory are only

  effected by bit 5-6.

  Note that bits 0-4 don't affect hugetlb or DAX memory. hugetlb memory is

  only affected by bit 5-6, and DAX is only affected by bits 7-8.



Default value of coredump_filter is 0x23; this means all anonymous memory

segments and hugetlb private memory are dumped.

The default value of coredump_filter is 0x33; this means all anonymous memory

segments, ELF header pages and hugetlb private memory are dumped.



If you don't want to dump all shared memory segments attached to pid 1234,

write 0x21 to the process's proc file.

write 0x31 to the process's proc file.



  $ echo 0x21 > /proc/1234/coredump_filter

  $ echo 0x31 > /proc/1234/coredump_filter



When a new process is created, the process inherits the bitmask status from its

parent. It is useful to set up coredump_filter before the program runs.

arch/x86/mm/init.c

+2 −2
Original line number Diff line number Diff line
@@ -354,7 +354,7 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range, 
	}



	for (i = 0; i < nr_range; i++)

		printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n",

		pr_debug(" [mem %#010lx-%#010lx] page %s\n",

				mr[i].start, mr[i].end - 1,

				page_size_string(&mr[i]));
@@ -401,7 +401,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, 
	unsigned long ret = 0;

	int nr_range, i;



	pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n",

	pr_debug("init_memory_mapping: [mem %#010lx-%#010lx]\n",

	       start, end - 1);



	memset(mr, 0, sizeof(mr));

arch/x86/mm/init_64.c

+2 −2
Original line number Diff line number Diff line
@@ -1270,7 +1270,7 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start, 
				/* check to see if we have contiguous blocks */

				if (p_end != p || node_start != node) {

					if (p_start)

						printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",

						pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",

						       addr_start, addr_end-1, p_start, p_end-1, node_start);

					addr_start = addr;

					node_start = node;
@@ -1368,7 +1368,7 @@ void register_page_bootmem_memmap(unsigned long section_nr, 
void __meminit vmemmap_populate_print_last(void)

{

	if (p_start) {

		printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",

		pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",

			addr_start, addr_end-1, p_start, p_end-1, node_start);

		p_start = NULL;

		p_end = NULL;

drivers/acpi/nfit.c

+242 −56
Original line number Diff line number Diff line
@@ -33,6 +33,15 @@ static bool force_enable_dimms; 
module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);

MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");



struct nfit_table_prev {

	struct list_head spas;

	struct list_head memdevs;

	struct list_head dcrs;

	struct list_head bdws;

	struct list_head idts;

	struct list_head flushes;

};



static u8 nfit_uuid[NFIT_UUID_MAX][16];



const u8 *to_nfit_uuid(enum nfit_uuids id)
@@ -221,12 +230,20 @@ static int nfit_spa_type(struct acpi_nfit_system_address *spa) 
}



static bool add_spa(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_system_address *spa)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa),

			GFP_KERNEL);

	struct nfit_spa *nfit_spa;



	list_for_each_entry(nfit_spa, &prev->spas, list) {

		if (memcmp(nfit_spa->spa, spa, sizeof(*spa)) == 0) {

			list_move_tail(&nfit_spa->list, &acpi_desc->spas);

			return true;

		}

	}



	nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), GFP_KERNEL);

	if (!nfit_spa)

		return false;

	INIT_LIST_HEAD(&nfit_spa->list);
@@ -239,12 +256,19 @@ static bool add_spa(struct acpi_nfit_desc *acpi_desc, 
}



static bool add_memdev(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_memory_map *memdev)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_memdev *nfit_memdev = devm_kzalloc(dev,

			sizeof(*nfit_memdev), GFP_KERNEL);

	struct nfit_memdev *nfit_memdev;



	list_for_each_entry(nfit_memdev, &prev->memdevs, list)

		if (memcmp(nfit_memdev->memdev, memdev, sizeof(*memdev)) == 0) {

			list_move_tail(&nfit_memdev->list, &acpi_desc->memdevs);

			return true;

		}



	nfit_memdev = devm_kzalloc(dev, sizeof(*nfit_memdev), GFP_KERNEL);

	if (!nfit_memdev)

		return false;

	INIT_LIST_HEAD(&nfit_memdev->list);
@@ -257,12 +281,19 @@ static bool add_memdev(struct acpi_nfit_desc *acpi_desc, 
}



static bool add_dcr(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_control_region *dcr)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_dcr *nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr),

			GFP_KERNEL);

	struct nfit_dcr *nfit_dcr;



	list_for_each_entry(nfit_dcr, &prev->dcrs, list)

		if (memcmp(nfit_dcr->dcr, dcr, sizeof(*dcr)) == 0) {

			list_move_tail(&nfit_dcr->list, &acpi_desc->dcrs);

			return true;

		}



	nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), GFP_KERNEL);

	if (!nfit_dcr)

		return false;

	INIT_LIST_HEAD(&nfit_dcr->list);
@@ -274,12 +305,19 @@ static bool add_dcr(struct acpi_nfit_desc *acpi_desc, 
}



static bool add_bdw(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_data_region *bdw)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_bdw *nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw),

			GFP_KERNEL);

	struct nfit_bdw *nfit_bdw;



	list_for_each_entry(nfit_bdw, &prev->bdws, list)

		if (memcmp(nfit_bdw->bdw, bdw, sizeof(*bdw)) == 0) {

			list_move_tail(&nfit_bdw->list, &acpi_desc->bdws);

			return true;

		}



	nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), GFP_KERNEL);

	if (!nfit_bdw)

		return false;

	INIT_LIST_HEAD(&nfit_bdw->list);
@@ -291,12 +329,19 @@ static bool add_bdw(struct acpi_nfit_desc *acpi_desc, 
}



static bool add_idt(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_interleave *idt)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_idt *nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt),

			GFP_KERNEL);

	struct nfit_idt *nfit_idt;



	list_for_each_entry(nfit_idt, &prev->idts, list)

		if (memcmp(nfit_idt->idt, idt, sizeof(*idt)) == 0) {

			list_move_tail(&nfit_idt->list, &acpi_desc->idts);

			return true;

		}



	nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt), GFP_KERNEL);

	if (!nfit_idt)

		return false;

	INIT_LIST_HEAD(&nfit_idt->list);
@@ -308,12 +353,19 @@ static bool add_idt(struct acpi_nfit_desc *acpi_desc, 
}



static bool add_flush(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev,

		struct acpi_nfit_flush_address *flush)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_flush *nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush),

			GFP_KERNEL);

	struct nfit_flush *nfit_flush;



	list_for_each_entry(nfit_flush, &prev->flushes, list)

		if (memcmp(nfit_flush->flush, flush, sizeof(*flush)) == 0) {

			list_move_tail(&nfit_flush->list, &acpi_desc->flushes);

			return true;

		}



	nfit_flush = devm_kzalloc(dev, sizeof(*nfit_flush), GFP_KERNEL);

	if (!nfit_flush)

		return false;

	INIT_LIST_HEAD(&nfit_flush->list);
@@ -324,8 +376,8 @@ static bool add_flush(struct acpi_nfit_desc *acpi_desc, 
	return true;

}



static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table,

		const void *end)

static void *add_table(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev, void *table, const void *end)

{

	struct device *dev = acpi_desc->dev;

	struct acpi_nfit_header *hdr;
@@ -335,29 +387,35 @@ static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, 
		return NULL;



	hdr = table;

	if (!hdr->length) {

		dev_warn(dev, "found a zero length table '%d' parsing nfit\n",

			hdr->type);

		return NULL;

	}



	switch (hdr->type) {

	case ACPI_NFIT_TYPE_SYSTEM_ADDRESS:

		if (!add_spa(acpi_desc, table))

		if (!add_spa(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_MEMORY_MAP:

		if (!add_memdev(acpi_desc, table))

		if (!add_memdev(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_CONTROL_REGION:

		if (!add_dcr(acpi_desc, table))

		if (!add_dcr(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_DATA_REGION:

		if (!add_bdw(acpi_desc, table))

		if (!add_bdw(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_INTERLEAVE:

		if (!add_idt(acpi_desc, table))

		if (!add_idt(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_FLUSH_ADDRESS:

		if (!add_flush(acpi_desc, table))

		if (!add_flush(acpi_desc, prev, table))

			return err;

		break;

	case ACPI_NFIT_TYPE_SMBIOS:
@@ -802,12 +860,7 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc) 
		device_handle = __to_nfit_memdev(nfit_mem)->device_handle;

		nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);

		if (nvdimm) {

			/*

			 * If for some reason we find multiple DCRs the

			 * first one wins

			 */

			dev_err(acpi_desc->dev, "duplicate DCR detected: %s\n",

					nvdimm_name(nvdimm));

			dimm_count++;

			continue;

		}
@@ -1476,6 +1529,9 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc, 
	struct resource res;

	int count = 0, rc;



	if (nfit_spa->is_registered)

		return 0;



	if (spa->range_index == 0) {

		dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",

				__func__);
@@ -1529,6 +1585,8 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc, 
		if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))

			return -ENOMEM;

	}



	nfit_spa->is_registered = 1;

	return 0;

}
@@ -1545,71 +1603,101 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) 
	return 0;

}



static int acpi_nfit_check_deletions(struct acpi_nfit_desc *acpi_desc,

		struct nfit_table_prev *prev)

{

	struct device *dev = acpi_desc->dev;



	if (!list_empty(&prev->spas) ||

			!list_empty(&prev->memdevs) ||

			!list_empty(&prev->dcrs) ||

			!list_empty(&prev->bdws) ||

			!list_empty(&prev->idts) ||

			!list_empty(&prev->flushes)) {

		dev_err(dev, "new nfit deletes entries (unsupported)\n");

		return -ENXIO;

	}

	return 0;

}



int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)

{

	struct device *dev = acpi_desc->dev;

	struct nfit_table_prev prev;

	const void *end;

	u8 *data;

	int rc;



	INIT_LIST_HEAD(&acpi_desc->spa_maps);

	INIT_LIST_HEAD(&acpi_desc->spas);

	INIT_LIST_HEAD(&acpi_desc->dcrs);

	INIT_LIST_HEAD(&acpi_desc->bdws);

	INIT_LIST_HEAD(&acpi_desc->idts);

	INIT_LIST_HEAD(&acpi_desc->flushes);

	INIT_LIST_HEAD(&acpi_desc->memdevs);

	INIT_LIST_HEAD(&acpi_desc->dimms);

	mutex_init(&acpi_desc->spa_map_mutex);

	mutex_lock(&acpi_desc->init_mutex);



	INIT_LIST_HEAD(&prev.spas);

	INIT_LIST_HEAD(&prev.memdevs);

	INIT_LIST_HEAD(&prev.dcrs);

	INIT_LIST_HEAD(&prev.bdws);

	INIT_LIST_HEAD(&prev.idts);

	INIT_LIST_HEAD(&prev.flushes);



	list_cut_position(&prev.spas, &acpi_desc->spas,

				acpi_desc->spas.prev);

	list_cut_position(&prev.memdevs, &acpi_desc->memdevs,

				acpi_desc->memdevs.prev);

	list_cut_position(&prev.dcrs, &acpi_desc->dcrs,

				acpi_desc->dcrs.prev);

	list_cut_position(&prev.bdws, &acpi_desc->bdws,

				acpi_desc->bdws.prev);

	list_cut_position(&prev.idts, &acpi_desc->idts,

				acpi_desc->idts.prev);

	list_cut_position(&prev.flushes, &acpi_desc->flushes,

				acpi_desc->flushes.prev);



	data = (u8 *) acpi_desc->nfit;

	end = data + sz;

	data += sizeof(struct acpi_table_nfit);

	while (!IS_ERR_OR_NULL(data))

		data = add_table(acpi_desc, data, end);

		data = add_table(acpi_desc, &prev, data, end);



	if (IS_ERR(data)) {

		dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__,

				PTR_ERR(data));

		return PTR_ERR(data);

		rc = PTR_ERR(data);

		goto out_unlock;

	}



	if (nfit_mem_init(acpi_desc) != 0)

		return -ENOMEM;

	rc = acpi_nfit_check_deletions(acpi_desc, &prev);

	if (rc)

		goto out_unlock;



	if (nfit_mem_init(acpi_desc) != 0) {

		rc = -ENOMEM;

		goto out_unlock;

	}



	acpi_nfit_init_dsms(acpi_desc);



	rc = acpi_nfit_register_dimms(acpi_desc);

	if (rc)

		return rc;

		goto out_unlock;



	rc = acpi_nfit_register_regions(acpi_desc);



	return acpi_nfit_register_regions(acpi_desc);

 out_unlock:

	mutex_unlock(&acpi_desc->init_mutex);

	return rc;

}

EXPORT_SYMBOL_GPL(acpi_nfit_init);



static int acpi_nfit_add(struct acpi_device *adev)

static struct acpi_nfit_desc *acpi_nfit_desc_init(struct acpi_device *adev)

{

	struct nvdimm_bus_descriptor *nd_desc;

	struct acpi_nfit_desc *acpi_desc;

	struct device *dev = &adev->dev;

	struct acpi_table_header *tbl;

	acpi_status status = AE_OK;

	acpi_size sz;

	int rc;



	status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);

	if (ACPI_FAILURE(status)) {

		dev_err(dev, "failed to find NFIT\n");

		return -ENXIO;

	}



	acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);

	if (!acpi_desc)

		return -ENOMEM;

		return ERR_PTR(-ENOMEM);



	dev_set_drvdata(dev, acpi_desc);

	acpi_desc->dev = dev;

	acpi_desc->nfit = (struct acpi_table_nfit *) tbl;

	acpi_desc->blk_do_io = acpi_nfit_blk_region_do_io;

	nd_desc = &acpi_desc->nd_desc;

	nd_desc->provider_name = "ACPI.NFIT";
@@ -1617,8 +1705,57 @@ static int acpi_nfit_add(struct acpi_device *adev) 
	nd_desc->attr_groups = acpi_nfit_attribute_groups;



	acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);

	if (!acpi_desc->nvdimm_bus)

		return -ENXIO;

	if (!acpi_desc->nvdimm_bus) {

		devm_kfree(dev, acpi_desc);

		return ERR_PTR(-ENXIO);

	}



	INIT_LIST_HEAD(&acpi_desc->spa_maps);

	INIT_LIST_HEAD(&acpi_desc->spas);

	INIT_LIST_HEAD(&acpi_desc->dcrs);

	INIT_LIST_HEAD(&acpi_desc->bdws);

	INIT_LIST_HEAD(&acpi_desc->idts);

	INIT_LIST_HEAD(&acpi_desc->flushes);

	INIT_LIST_HEAD(&acpi_desc->memdevs);

	INIT_LIST_HEAD(&acpi_desc->dimms);

	mutex_init(&acpi_desc->spa_map_mutex);

	mutex_init(&acpi_desc->init_mutex);



	return acpi_desc;

}



static int acpi_nfit_add(struct acpi_device *adev)

{

	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };

	struct acpi_nfit_desc *acpi_desc;

	struct device *dev = &adev->dev;

	struct acpi_table_header *tbl;

	acpi_status status = AE_OK;

	acpi_size sz;

	int rc;



	status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz);

	if (ACPI_FAILURE(status)) {

		/* This is ok, we could have an nvdimm hotplugged later */

		dev_dbg(dev, "failed to find NFIT at startup\n");

		return 0;

	}



	acpi_desc = acpi_nfit_desc_init(adev);

	if (IS_ERR(acpi_desc)) {

		dev_err(dev, "%s: error initializing acpi_desc: %ld\n",

				__func__, PTR_ERR(acpi_desc));

		return PTR_ERR(acpi_desc);

	}



	acpi_desc->nfit = (struct acpi_table_nfit *) tbl;



	/* Evaluate _FIT and override with that if present */

	status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);

	if (ACPI_SUCCESS(status) && buf.length > 0) {

		acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer;

		sz = buf.length;

	}



	rc = acpi_nfit_init(acpi_desc, sz);

	if (rc) {
@@ -1636,6 +1773,54 @@ static int acpi_nfit_remove(struct acpi_device *adev) 
	return 0;

}



static void acpi_nfit_notify(struct acpi_device *adev, u32 event)

{

	struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev);

	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };

	struct acpi_table_nfit *nfit_saved;

	struct device *dev = &adev->dev;

	acpi_status status;

	int ret;



	dev_dbg(dev, "%s: event: %d\n", __func__, event);



	device_lock(dev);

	if (!dev->driver) {

		/* dev->driver may be null if we're being removed */

		dev_dbg(dev, "%s: no driver found for dev\n", __func__);

		return;

	}



	if (!acpi_desc) {

		acpi_desc = acpi_nfit_desc_init(adev);

		if (IS_ERR(acpi_desc)) {

			dev_err(dev, "%s: error initializing acpi_desc: %ld\n",

				__func__, PTR_ERR(acpi_desc));

			goto out_unlock;

		}

	}



	/* Evaluate _FIT */

	status = acpi_evaluate_object(adev->handle, "_FIT", NULL, &buf);

	if (ACPI_FAILURE(status)) {

		dev_err(dev, "failed to evaluate _FIT\n");

		goto out_unlock;

	}



	nfit_saved = acpi_desc->nfit;

	acpi_desc->nfit = (struct acpi_table_nfit *)buf.pointer;

	ret = acpi_nfit_init(acpi_desc, buf.length);

	if (!ret) {

		/* Merge failed, restore old nfit, and exit */

		acpi_desc->nfit = nfit_saved;

		dev_err(dev, "failed to merge updated NFIT\n");

	}

	kfree(buf.pointer);



 out_unlock:

	device_unlock(dev);

}



static const struct acpi_device_id acpi_nfit_ids[] = {

	{ "ACPI0012", 0 },

	{ "", 0 },
@@ -1648,6 +1833,7 @@ static struct acpi_driver acpi_nfit_driver = { 
	.ops = {

		.add = acpi_nfit_add,

		.remove = acpi_nfit_remove,

		.notify = acpi_nfit_notify,

	},

};

drivers/acpi/nfit.h

+2 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ enum { 
struct nfit_spa {

	struct acpi_nfit_system_address *spa;

	struct list_head list;

	int is_registered;

};



struct nfit_dcr {
@@ -97,6 +98,7 @@ struct acpi_nfit_desc { 
	struct nvdimm_bus_descriptor nd_desc;

	struct acpi_table_nfit *nfit;

	struct mutex spa_map_mutex;

	struct mutex init_mutex;

	struct list_head spa_maps;

	struct list_head memdevs;

	struct list_head flushes;

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