From: Oscar Salvador <osalvador@xxxxxxxx>
commit 2c2a5af6fed20cf74401c9d64319c76c5ff81309 upstream.
-- snip --
Missing unification of mm/hmm.c and kernel/memremap.c
-- snip --
Patch series "Do not touch pages in hot-remove path", v2.
This patchset aims for two things:
1) A better definition about offline and hot-remove stage
2) Solving bugs where we can access non-initialized pages
during hot-remove operations [2] [3].
This is achieved by moving all page/zone handling to the offline
stage, so we do not need to access pages when hot-removing memory.
[1] https://patchwork.kernel.org/cover/10691415/
[2] https://patchwork.kernel.org/patch/10547445/
[3] https://www.spinics.net/lists/linux-mm/msg161316.html
This patch (of 5):
This is a preparation for the following-up patches. The idea of passing
the nid is that it will allow us to get rid of the zone parameter
afterwards.
Link: http://lkml.kernel.org/r/20181127162005.15833-2-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@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>
---
arch/ia64/mm/init.c | 2 +-
arch/powerpc/mm/mem.c | 3 ++-
arch/s390/mm/init.c | 2 +-
arch/sh/mm/init.c | 2 +-
arch/x86/mm/init_32.c | 2 +-
arch/x86/mm/init_64.c | 3 ++-
include/linux/memory_hotplug.h | 4 ++--
kernel/memremap.c | 5 ++++-
mm/hmm.c | 4 +++-
mm/memory_hotplug.c | 2 +-
10 files changed, 18 insertions(+), 11 deletions(-)
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -662,7 +662,7 @@ int arch_add_memory(int nid, u64 start,
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -140,7 +140,8 @@ int __meminit arch_add_memory(int nid, u
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int __meminit arch_remove_memory(int nid, u64 start, u64 size,
+ struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -240,7 +240,7 @@ int arch_add_memory(int nid, u64 start,
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap)
{
/*
* There is no hardware or firmware interface which could trigger a
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -444,7 +444,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to
#endif
#ifdef CONFIG_MEMORY_HOTREMOVE
-int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -861,7 +861,7 @@ int arch_add_memory(int nid, u64 start,
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1142,7 +1142,8 @@ kernel_physical_mapping_remove(unsigned
remove_pagetable(start, end, true, NULL);
}
-int __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+int __ref arch_remove_memory(int nid, u64 start, u64 size,
+ struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -109,8 +109,8 @@ static inline bool movable_node_is_enabl
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-extern int arch_remove_memory(u64 start, u64 size,
- struct vmem_altmap *altmap);
+extern int arch_remove_memory(int nid, u64 start, u64 size,
+ struct vmem_altmap *altmap);
extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
#endif /* CONFIG_MEMORY_HOTREMOVE */
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -121,6 +121,7 @@ static void devm_memremap_pages_release(
struct resource *res = &pgmap->res;
resource_size_t align_start, align_size;
unsigned long pfn;
+ int nid;
pgmap->kill(pgmap->ref);
for_each_device_pfn(pfn, pgmap)
@@ -131,13 +132,15 @@ static void devm_memremap_pages_release(
align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
- align_start;
+ nid = page_to_nid(pfn_to_page(align_start >> PAGE_SHIFT));
+
mem_hotplug_begin();
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
pfn = align_start >> PAGE_SHIFT;
__remove_pages(page_zone(pfn_to_page(pfn)), pfn,
align_size >> PAGE_SHIFT, NULL);
} else {
- arch_remove_memory(align_start, align_size,
+ arch_remove_memory(nid, align_start, align_size,
pgmap->altmap_valid ? &pgmap->altmap : NULL);
kasan_remove_zero_shadow(__va(align_start), align_size);
}
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -999,6 +999,7 @@ static void hmm_devmem_release(void *dat
unsigned long start_pfn, npages;
struct zone *zone;
struct page *page;
+ int nid;
/* pages are dead and unused, undo the arch mapping */
start_pfn = (resource->start & ~(PA_SECTION_SIZE - 1)) >> PAGE_SHIFT;
@@ -1006,12 +1007,13 @@ static void hmm_devmem_release(void *dat
page = pfn_to_page(start_pfn);
zone = page_zone(page);
+ nid = page_to_nid(page);
mem_hotplug_begin();
if (resource->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY)
__remove_pages(zone, start_pfn, npages, NULL);
else
- arch_remove_memory(start_pfn << PAGE_SHIFT,
+ arch_remove_memory(nid, start_pfn << PAGE_SHIFT,
npages << PAGE_SHIFT, NULL);
mem_hotplug_done();
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1916,7 +1916,7 @@ void __ref __remove_memory(int nid, u64
memblock_free(start, size);
memblock_remove(start, size);
- arch_remove_memory(start, size, NULL);
+ arch_remove_memory(nid, start, size, NULL);
try_offline_node(nid);
