commit 80ec922dbd87fd38d15719c86a94457204648aeb upstream.
-- snip --
Missing arm64 memory hot(un)plug support.
-- snip --
We want to improve error handling while adding memory by allowing to use
arch_remove_memory() and __remove_pages() even if
CONFIG_MEMORY_HOTREMOVE is not set to e.g., implement something like:
arch_add_memory()
rc = do_something();
if (rc) {
arch_remove_memory();
}
We won't get rid of CONFIG_MEMORY_HOTREMOVE for now, as it will require
quite some dependencies for memory offlining.
Link: http://lkml.kernel.org/r/20190527111152.16324-7-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: "mike.travis@xxxxxxx" <mike.travis@xxxxxxx>
Cc: Andrew Banman <andrew.banman@xxxxxxx>
Cc: Arun KS <arunks@xxxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Jun Yao <yaojun8558363@xxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
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>
---
arch/ia64/mm/init.c | 2 --
arch/powerpc/mm/mem.c | 2 --
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 | 2 --
drivers/base/memory.c | 2 --
include/linux/memory.h | 2 --
include/linux/memory_hotplug.h | 2 --
mm/memory_hotplug.c | 2 --
mm/sparse.c | 6 ------
11 files changed, 26 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 950a9e0a4548..778781e5f22e 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -661,7 +661,6 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -673,4 +672,3 @@ void arch_remove_memory(int nid, u64 start, u64 size,
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
#endif
-#endif
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index d3fd0095aae6..a9c1aaa0c133 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -139,7 +139,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altm
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void __ref arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -173,7 +172,6 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
pr_warn("Hash collision while resizing HPT\n");
}
#endif
-#endif /* CONFIG_MEMORY_HOTPLUG */
/*
* walk_memory_resource() needs to make sure there is no holes in a given
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index fc761001fa94..e0b0788cfecb 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -239,7 +239,6 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
return rc;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -251,5 +250,4 @@ void arch_remove_memory(int nid, u64 start, u64 size,
__remove_pages(zone, start_pfn, nr_pages, altmap);
vmem_remove_mapping(start, size);
}
-#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 59ae5d7dc081..0da784ac0e34 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -443,7 +443,6 @@ int memory_add_physaddr_to_nid(u64 addr)
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -454,5 +453,4 @@ void arch_remove_memory(int nid, u64 start, u64 size,
zone = page_zone(pfn_to_page(start_pfn));
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
-#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index c6a50a0f240b..64f54f77052b 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -860,7 +860,6 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -872,7 +871,6 @@ void arch_remove_memory(int nid, u64 start, u64 size,
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
#endif
-#endif
int kernel_set_to_readonly __read_mostly;
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b9e15f25b921..50df7ca142f9 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1132,7 +1132,6 @@ void __ref vmemmap_free(unsigned long start, unsigned long end,
remove_pagetable(start, end, false, altmap);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void __meminit
kernel_physical_mapping_remove(unsigned long start, unsigned long end)
{
@@ -1157,7 +1156,6 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
__remove_pages(zone, start_pfn, nr_pages, altmap);
kernel_physical_mapping_remove(start, start + size);
}
-#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
static struct kcore_list kcore_vsyscall;
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 5b9950d982dc..9a5f81dc32c5 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -737,7 +737,6 @@ int hotplug_memory_register(int nid, struct mem_section *section)
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void
unregister_memory(struct memory_block *memory)
{
@@ -776,7 +775,6 @@ void unregister_memory_section(struct mem_section *section)
out_unlock:
mutex_unlock(&mem_sysfs_mutex);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
/* return true if the memory block is offlined, otherwise, return false */
bool is_memblock_offlined(struct memory_block *mem)
diff --git a/include/linux/memory.h b/include/linux/memory.h
index e1dc1bb2b787..474c7c60c8f2 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -112,9 +112,7 @@ 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);
int hotplug_memory_register(int nid, struct mem_section *section);
-#ifdef CONFIG_MEMORY_HOTREMOVE
extern void unregister_memory_section(struct mem_section *);
-#endif
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);
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 04c40da0228a..5ac58325e8fc 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -108,12 +108,10 @@ static inline bool movable_node_is_enabled(void)
return movable_node_enabled;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
extern void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap);
extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
-#endif /* CONFIG_MEMORY_HOTREMOVE */
/* reasonably generic interface to expand the physical pages */
extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7905e3275289..6b5ce0bd907f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -315,7 +315,6 @@ int __ref __add_pages(int nid, unsigned long phys_start_pfn,
return err;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,
unsigned long start_pfn,
@@ -542,7 +541,6 @@ void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
set_zone_contiguous(zone);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
int set_online_page_callback(online_page_callback_t callback)
{
diff --git a/mm/sparse.c b/mm/sparse.c
index f52e8c328761..6f624ce9252e 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -576,7 +576,6 @@ static void __kfree_section_memmap(struct page *memmap,
vmemmap_free(start, end, altmap);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void free_map_bootmem(struct page *memmap)
{
unsigned long start = (unsigned long)memmap;
@@ -584,7 +583,6 @@ static void free_map_bootmem(struct page *memmap)
vmemmap_free(start, end, NULL);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#else
static struct page *__kmalloc_section_memmap(void)
{
@@ -623,7 +621,6 @@ static void __kfree_section_memmap(struct page *memmap,
get_order(sizeof(struct page) * PAGES_PER_SECTION));
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void free_map_bootmem(struct page *memmap)
{
unsigned long maps_section_nr, removing_section_nr, i;
@@ -653,7 +650,6 @@ static void free_map_bootmem(struct page *memmap)
put_page_bootmem(page);
}
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/*
@@ -712,7 +708,6 @@ int __meminit sparse_add_one_section(int nid, unsigned long start_pfn,
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
#ifdef CONFIG_MEMORY_FAILURE
static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
{
@@ -780,5 +775,4 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
PAGES_PER_SECTION - map_offset);
free_section_usemap(memmap, usemap, altmap);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_MEMORY_HOTPLUG */
--
2.24.1
