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Date: Mon, 8 Apr 2019 12:12:26 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Andrew Banman <andrew.banman@....com>, mike.travis@....com,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Oscar Salvador <osalvador@...e.de>,
Michal Hocko <mhocko@...e.com>,
Pavel Tatashin <pavel.tatashin@...rosoft.com>,
Wei Yang <richard.weiyang@...il.com>, Qian Cai <cai@....pw>,
Arun KS <arunks@...eaurora.org>,
Mathieu Malaterre <malat@...ian.org>, linux-mm@...ck.org,
dan.j.williams@...el.com, David Hildenbrand <david@...hat.com>
Subject: [PATCH RFC 3/3] mm/memory_hotplug: Remove memory block devices before arch_remove_memory()
Let's factor out removing of memory block devices, which is only
necessary for memory added via add_memory() and friends that created
memory block devices. Remove the devices before calling
arch_remove_memory().
TODO: We should try to get rid of the errors that could be reported by
unregister_memory_block_under_nodes(). Ignoring failures is not that
nice.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
drivers/base/memory.c | 41 +++++++++++++++--------------------------
drivers/base/node.c | 7 +++----
include/linux/memory.h | 2 +-
include/linux/node.h | 6 ++----
mm/memory_hotplug.c | 10 ++++------
5 files changed, 25 insertions(+), 41 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 847b33061e2e..fd8940c37129 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -752,40 +752,29 @@ int hotplug_memory_register(unsigned long start, unsigned long size)
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-static int remove_memory_section(struct mem_section *section)
+void hotplug_memory_unregister(unsigned long start, unsigned long size)
{
+ unsigned long block_nr_pages = memory_block_size_bytes() >> PAGE_SHIFT;
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT);
struct memory_block *mem;
+ unsigned long pfn;
- mutex_lock(&mem_sysfs_mutex);
-
- /*
- * Some users of the memory hotplug do not want/need memblock to
- * track all sections. Skip over those.
- */
- mem = find_memory_block(section);
- if (!mem)
- goto out_unlock;
-
- unregister_mem_sect_under_nodes(mem, __section_nr(section));
+ BUG_ON(!IS_ALIGNED(start, memory_block_size_bytes()));
+ BUG_ON(!IS_ALIGNED(size, memory_block_size_bytes()));
- mem->section_count--;
- if (mem->section_count == 0)
+ mutex_lock(&mem_sysfs_mutex);
+ for (pfn = start_pfn; pfn != end_pfn; pfn += block_nr_pages) {
+ mem = find_memory_block(__pfn_to_section(pfn));
+ if (!mem)
+ continue;
+ mem->section_count = 0;
+ unregister_memory_block_under_nodes(mem);
unregister_memory(mem);
- else
- put_device(&mem->dev);
-
-out_unlock:
+ }
mutex_unlock(&mem_sysfs_mutex);
- return 0;
}
-int unregister_memory_section(struct mem_section *section)
-{
- if (!present_section(section))
- return -EINVAL;
-
- return remove_memory_section(section);
-}
#endif /* CONFIG_MEMORY_HOTREMOVE */
/* return true if the memory block is offlined, otherwise, return false */
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 8598fcbd2a17..f9997770ac15 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -802,8 +802,7 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg)
}
/* unregister memory section under all nodes that it spans */
-int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
- unsigned long phys_index)
+int unregister_memory_block_under_nodes(struct memory_block *mem_blk)
{
NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
unsigned long pfn, sect_start_pfn, sect_end_pfn;
@@ -816,8 +815,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
return -ENOMEM;
nodes_clear(*unlinked_nodes);
- sect_start_pfn = section_nr_to_pfn(phys_index);
- sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
+ sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
+ sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
int nid;
diff --git a/include/linux/memory.h b/include/linux/memory.h
index e275dc775834..414e43ab0881 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -113,7 +113,7 @@ extern int register_memory_isolate_notifier(struct notifier_block *nb);
extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
int hotplug_memory_register(unsigned long start, unsigned long size);
#ifdef CONFIG_MEMORY_HOTREMOVE
-extern int unregister_memory_section(struct mem_section *);
+void hotplug_memory_unregister(unsigned long start, unsigned long size);
#endif
extern int memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
diff --git a/include/linux/node.h b/include/linux/node.h
index 1a557c589ecb..02a29e71b175 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -139,8 +139,7 @@ extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int register_mem_sect_under_node(struct memory_block *mem_blk,
void *arg);
-extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
- unsigned long phys_index);
+extern int unregister_memory_block_under_nodes(struct memory_block *mem_blk);
extern int register_memory_node_under_compute_node(unsigned int mem_nid,
unsigned int cpu_nid,
@@ -176,8 +175,7 @@ static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
{
return 0;
}
-static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
- unsigned long phys_index)
+static inline int unregister_memory_block_under_nodes(struct memory_block *mem_blk)
{
return 0;
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 13ee0a26e034..041b93c5eede 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -518,14 +518,9 @@ static int __remove_section(struct zone *zone, struct mem_section *ms,
{
unsigned long start_pfn;
int scn_nr;
- int ret = -EINVAL;
if (!valid_section(ms))
- return ret;
-
- ret = unregister_memory_section(ms);
- if (ret)
- return ret;
+ return -EINVAL;
scn_nr = __section_nr(ms);
start_pfn = section_nr_to_pfn((unsigned long)scn_nr);
@@ -1875,6 +1870,9 @@ void __ref __remove_memory(int nid, u64 start, u64 size)
memblock_free(start, size);
memblock_remove(start, size);
+ /* remove memory block devices before removing memory */
+ hotplug_memory_unregister(start, size);
+
arch_remove_memory(nid, start, size, NULL);
try_offline_node(nid);
--
2.17.2
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