[to-be-updated] mm-fix-register_new_memory-zone-type-detection.patch removed from -mm tree

[to-be-updated] mm-fix-register_new_memory-zone-type-detection.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm: fix register_new_memory() zone type detection
has been removed from the -mm tree.  Its filename was
     mm-fix-register_new_memory-zone-type-detection.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Dan Williams <dan.j.williams@intel.com>
Subject: mm: fix register_new_memory() zone type detection

In preparation for sub-section memory hotplug support, remove a dependency
on ->section_mem_map being populated.  In SPARSEMEM_VMEMMAP=y
configurations pfn_to_page() does not use ->section_mem_map.  The
sub-section hotplug support relies on this fact and skips initializing it.
Without ->section_mem_map populated, or aligned to section boundary,
conversions of mem_section instances to zones is not possible.

So, this removes a false dependency on a structure field that will only be
valid in the SPARSEMEM_VMEMMAP=n case, and only used for pfn_to_page()
(and similar) operations.

Link: http://lkml.kernel.org/r/148486363923.19694.16803321290568634521.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Stephen Bates <stephen.bates@microsemi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/base/memory.c  |   26 +++++++++-----------------
 include/linux/memory.h |    4 ++--
 mm/memory_hotplug.c    |    4 ++--
 3 files changed, 13 insertions(+), 21 deletions(-)

diff -puN drivers/base/memory.c~mm-fix-register_new_memory-zone-type-detection drivers/base/memory.c
--- a/drivers/base/memory.c~mm-fix-register_new_memory-zone-type-detection
+++ a/drivers/base/memory.c
@@ -685,24 +685,16 @@ static int add_memory_block(int base_sec
 	return 0;
 }
 
-static bool is_zone_device_section(struct mem_section *ms)
-{
-	struct page *page;
-
-	page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
-	return is_zone_device_page(page);
-}
-
 /*
  * need an interface for the VM to add new memory regions,
  * but without onlining it.
  */
-int register_new_memory(int nid, struct mem_section *section)
+int register_new_memory(struct zone *zone, int nid, struct mem_section *section)
 {
 	int ret = 0;
 	struct memory_block *mem;
 
-	if (is_zone_device_section(section))
+	if (is_dev_zone(zone))
 		return 0;
 
 	mutex_lock(&mem_sysfs_mutex);
@@ -736,14 +728,11 @@ unregister_memory(struct memory_block *m
 	device_unregister(&memory->dev);
 }
 
-static int remove_memory_section(unsigned long node_id,
-			       struct mem_section *section, int phys_device)
+static int remove_memory_section(struct zone *zone, unsigned long node_id,
+		struct mem_section *section, int phys_device)
 {
 	struct memory_block *mem;
 
-	if (is_zone_device_section(section))
-		return 0;
-
 	mutex_lock(&mem_sysfs_mutex);
 	mem = find_memory_block(section);
 	unregister_mem_sect_under_nodes(mem, __section_nr(section));
@@ -758,12 +747,15 @@ static int remove_memory_section(unsigne
 	return 0;
 }
 
-int unregister_memory_section(struct mem_section *section)
+int unregister_memory_section(struct zone *zone, struct mem_section *section)
 {
+	if (is_dev_zone(zone))
+		return 0;
+
 	if (!present_section(section))
 		return -EINVAL;
 
-	return remove_memory_section(0, section, 0);
+	return remove_memory_section(zone, 0, section, 0);
 }
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
diff -puN include/linux/memory.h~mm-fix-register_new_memory-zone-type-detection include/linux/memory.h
--- a/include/linux/memory.h~mm-fix-register_new_memory-zone-type-detection
+++ a/include/linux/memory.h
@@ -108,12 +108,12 @@ extern int register_memory_notifier(stru
 extern void unregister_memory_notifier(struct notifier_block *nb);
 extern int register_memory_isolate_notifier(struct notifier_block *nb);
 extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
-extern int register_new_memory(int, struct mem_section *);
+extern int register_new_memory(struct zone *, int, struct mem_section *);
 extern int memory_block_change_state(struct memory_block *mem,
 				     unsigned long to_state,
 				     unsigned long from_state_req);
 #ifdef CONFIG_MEMORY_HOTREMOVE
-extern int unregister_memory_section(struct mem_section *);
+extern int unregister_memory_section(struct zone *, struct mem_section *);
 #endif
 extern int memory_dev_init(void);
 extern int memory_notify(unsigned long val, void *v);
diff -puN mm/memory_hotplug.c~mm-fix-register_new_memory-zone-type-detection mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~mm-fix-register_new_memory-zone-type-detection
+++ a/mm/memory_hotplug.c
@@ -517,7 +517,7 @@ static int __meminit __add_section(int n
 	if (ret < 0)
 		return ret;
 
-	return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
+	return register_new_memory(zone, nid, __pfn_to_section(phys_start_pfn));
 }
 
 /*
@@ -784,7 +784,7 @@ static int __remove_section(struct zone
 	if (!valid_section(ms))
 		return ret;
 
-	ret = unregister_memory_section(ms);
+	ret = unregister_memory_section(zone, ms);
 	if (ret)
 		return ret;
 
_

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

mm-convert-kmalloc_section_memmap-to-populate_section_memmap.patch
mm-prepare-for-hot-add-remove-of-sub-section-ranges.patch
mm-support-section-unaligned-zone_device-memory-ranges.patch
mm-enable-section-unaligned-devm_memremap_pages.patch
libnvdimm-pfn-dax-stop-padding-pmem-namespaces-to-section-alignment.patch
mm-fix-get_user_pages-vs-device-dax-pud-mappings.patch