This is a note to let you know that I've just added the patch titled
mm/memory_hotplug: remove memory block devices before arch_remove_memory()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-memory_hotplug-remove-memory-block-devices-before-arch_remove_memory.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue 28 Jan 2020 02:32:10 PM CET
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Tue, 28 Jan 2020 10:50:14 +0100
Subject: mm/memory_hotplug: remove memory block devices before arch_remove_memory()
To: stable@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx, Michal Hocko <mhocko@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Aneesh Kumar K . V" <aneesh.kumar@xxxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Oscar Salvador <osalvador@xxxxxxx>, Wei Yang <richard.weiyang@xxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>
Message-ID: <20200128095021.8076-18-david@xxxxxxxxxx>
From: David Hildenbrand <david@xxxxxxxxxx>
commit 4c4b7f9ba9486c565aead99a198ceeef73ae81f6 upstream.
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().
This finishes factoring out memory block device handling from
arch_add_memory() and arch_remove_memory().
Link: http://lkml.kernel.org/r/20190527111152.16324-10-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: "mike.travis@xxxxxxx" <mike.travis@xxxxxxx>
Cc: Andrew Banman <andrew.banman@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Jun Yao <yaojun8558363@xxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/memory.c | 37 ++++++++++++++++++-------------------
drivers/base/node.c | 11 ++++++-----
include/linux/memory.h | 2 +-
include/linux/node.h | 6 ++----
mm/memory_hotplug.c | 5 +++--
5 files changed, 30 insertions(+), 31 deletions(-)
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -768,32 +768,31 @@ int create_memory_block_devices(unsigned
return ret;
}
-void unregister_memory_section(struct mem_section *section)
+/*
+ * Remove memory block devices for the given memory area. Start and size
+ * have to be aligned to memory block granularity. Memory block devices
+ * have to be offline.
+ */
+void remove_memory_block_devices(unsigned long start, unsigned long size)
{
+ const int start_block_id = pfn_to_block_id(PFN_DOWN(start));
+ const int end_block_id = pfn_to_block_id(PFN_DOWN(start + size));
struct memory_block *mem;
+ int block_id;
- if (WARN_ON_ONCE(!present_section(section)))
+ if (WARN_ON_ONCE(!IS_ALIGNED(start, memory_block_size_bytes()) ||
+ !IS_ALIGNED(size, memory_block_size_bytes())))
return;
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));
-
- mem->section_count--;
- if (mem->section_count == 0)
+ for (block_id = start_block_id; block_id != end_block_id; block_id++) {
+ mem = find_memory_block_by_id(block_id, NULL);
+ if (WARN_ON_ONCE(!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);
}
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -453,9 +453,10 @@ int register_mem_sect_under_node(struct
return 0;
}
-/* unregister memory section under all nodes that it spans */
-int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
- unsigned long phys_index)
+/*
+ * Unregister memory block device under all nodes that it spans.
+ */
+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;
@@ -468,8 +469,8 @@ int unregister_mem_sect_under_nodes(stru
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;
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -112,7 +112,7 @@ extern void unregister_memory_notifier(s
extern int register_memory_isolate_notifier(struct notifier_block *nb);
extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
int create_memory_block_devices(unsigned long start, unsigned long size);
-extern void unregister_memory_section(struct mem_section *);
+void remove_memory_block_devices(unsigned long start, unsigned long size);
extern int memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
extern int memory_isolate_notify(unsigned long val, void *v);
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -72,8 +72,7 @@ extern int register_cpu_under_node(unsig
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);
#ifdef CONFIG_HUGETLBFS
extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
@@ -105,8 +104,7 @@ static inline int register_mem_sect_unde
{
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;
}
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -481,8 +481,6 @@ static void __remove_section(struct zone
if (WARN_ON_ONCE(!valid_section(ms)))
return;
- unregister_memory_section(ms);
-
scn_nr = __section_nr(ms);
start_pfn = section_nr_to_pfn((unsigned long)scn_nr);
__remove_zone(zone, start_pfn);
@@ -1914,6 +1912,9 @@ void __ref __remove_memory(int nid, u64
memblock_free(start, size);
memblock_remove(start, size);
+ /* remove memory block devices before removing memory */
+ remove_memory_block_devices(start, size);
+
arch_remove_memory(nid, start, size, NULL);
__release_memory_resource(start, size);
Patches currently in stable-queue which might be from david@xxxxxxxxxx are
queue-4.19/mm-memory_hotplug-remove-memory-block-devices-before-arch_remove_memory.patch
queue-4.19/mm-hotplug-kill-is_dev_zone-usage-in-__remove_pages.patch
queue-4.19/mm-memory_hotplug-create-memory-block-devices-after-arch_add_memory.patch
queue-4.19/drivers-base-memory-pass-a-block_id-to-init_memory_block.patch
queue-4.19/drivers-base-memory.c-clean-up-relics-in-function-parameters.patch
queue-4.19/mm-memory_hotplug-update-a-comment-in-unregister_memory.patch
queue-4.19/mm-memory_hotplug-shrink-zones-when-offlining-memory.patch
queue-4.19/mm-memory_hotplug-make-unregister_memory_block_under_nodes-never-fail.patch
queue-4.19/mm-memunmap-don-t-access-uninitialized-memmap-in-memunmap_pages.patch
queue-4.19/mm-memory_hotplug-make-__remove_section-never-fail.patch
queue-4.19/mm-sparse-drop-pgdat_resize_lock-in-sparse_add-remove_one_section.patch
queue-4.19/mm-memory_hotplug-make-unregister_memory_section-never-fail.patch
queue-4.19/mm-memory_hotplug-release-memory-resource-after-arch_remove_memory.patch
queue-4.19/mm-memory_hotplug-add-nid-parameter-to-arch_remove_memory.patch
queue-4.19/powerpc-mm-fix-section-mismatch-warning.patch
queue-4.19/mm-memory_hotplug-allow-arch_remove_memory-without-config_memory_hotremove.patch
queue-4.19/mm-memory_hotplug-make-remove_memory-take-the-device_hotplug_lock.patch
queue-4.19/mm-memory_hotplug-make-__remove_pages-and-arch_remove_memory-never-fail.patch
queue-4.19/mm-memory_hotplug-fix-try_offline_node.patch
queue-4.19/mm-memory_hotplug-remove-zone-parameter-from-sparse_remove_one_section.patch
queue-4.19/drivers-base-memory.c-remove-an-unnecessary-check-on-nr_mem_sections.patch
queue-4.19/drivers-base-node.c-simplify-unregister_memory_block_under_nodes.patch
queue-4.19/s390x-mm-implement-arch_remove_memory.patch
queue-4.19/mm-sparse-pass-nid-instead-of-pgdat-to-sparse_add_one_section.patch
