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@xxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Stephen Bates <stephen.bates@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx 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
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