From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/memory_hotplug: allow arch_remove_memory() without CONFIG_MEMORY_HOTREMOVE
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>
---
arch/arm64/mm/mmu.c | 2 --
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 ------
12 files changed, 28 deletions(-)
--- a/arch/arm64/mm/mmu.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/arm64/mm/mmu.c
@@ -1074,7 +1074,6 @@ int arch_add_memory(int nid, u64 start,
return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
restrictions);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -1093,4 +1092,3 @@ void arch_remove_memory(int nid, u64 sta
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
#endif
-#endif
--- a/arch/ia64/mm/init.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/ia64/mm/init.c
@@ -681,7 +681,6 @@ int arch_add_memory(int nid, u64 start,
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -693,4 +692,3 @@ void arch_remove_memory(int nid, u64 sta
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
#endif
-#endif
--- a/arch/powerpc/mm/mem.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/powerpc/mm/mem.c
@@ -125,7 +125,6 @@ int __ref arch_add_memory(int nid, u64 s
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void __ref arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -151,7 +150,6 @@ void __ref arch_remove_memory(int nid, u
pr_warn("Hash collision while resizing HPT\n");
}
#endif
-#endif /* CONFIG_MEMORY_HOTPLUG */
#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init mem_topology_setup(void)
--- a/arch/s390/mm/init.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/s390/mm/init.c
@@ -286,7 +286,6 @@ int arch_add_memory(int nid, u64 start,
return rc;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -298,5 +297,4 @@ void arch_remove_memory(int nid, u64 sta
__remove_pages(zone, start_pfn, nr_pages, altmap);
vmem_remove_mapping(start, size);
}
-#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
--- a/arch/sh/mm/init.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/sh/mm/init.c
@@ -429,7 +429,6 @@ 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)
{
@@ -440,5 +439,4 @@ void arch_remove_memory(int nid, u64 sta
zone = page_zone(pfn_to_page(start_pfn));
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
-#endif
#endif /* CONFIG_MEMORY_HOTPLUG */
--- a/arch/x86/mm/init_32.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/x86/mm/init_32.c
@@ -860,7 +860,6 @@ int arch_add_memory(int nid, u64 start,
return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
-#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 sta
__remove_pages(zone, start_pfn, nr_pages, altmap);
}
#endif
-#endif
int kernel_set_to_readonly __read_mostly;
--- a/arch/x86/mm/init_64.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/arch/x86/mm/init_64.c
@@ -1198,7 +1198,6 @@ void __ref vmemmap_free(unsigned long st
remove_pagetable(start, end, false, altmap);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void __meminit
kernel_physical_mapping_remove(unsigned long start, unsigned long end)
{
@@ -1219,7 +1218,6 @@ void __ref arch_remove_memory(int nid, u
__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;
--- a/drivers/base/memory.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/drivers/base/memory.c
@@ -723,7 +723,6 @@ out:
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void
unregister_memory(struct memory_block *memory)
{
@@ -762,7 +761,6 @@ void unregister_memory_section(struct me
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)
--- a/include/linux/memory.h~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/include/linux/memory.h
@@ -112,9 +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 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);
--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/include/linux/memory_hotplug.h
@@ -123,12 +123,10 @@ static inline bool movable_node_is_enabl
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 */
/*
* Do we want sysfs memblock files created. This will allow userspace to online
--- a/mm/memory_hotplug.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/mm/memory_hotplug.c
@@ -318,7 +318,6 @@ out:
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,
@@ -580,7 +579,6 @@ void __remove_pages(struct zone *zone, u
set_zone_contiguous(zone);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
int set_online_page_callback(online_page_callback_t callback)
{
--- a/mm/sparse.c~mm-memory_hotplug-allow-arch_remove_pages-without-config_memory_hotremove
+++ a/mm/sparse.c
@@ -604,7 +604,6 @@ static void __kfree_section_memmap(struc
vmemmap_free(start, end, altmap);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void free_map_bootmem(struct page *memmap)
{
unsigned long start = (unsigned long)memmap;
@@ -612,7 +611,6 @@ static void free_map_bootmem(struct page
vmemmap_free(start, end, NULL);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#else
static struct page *__kmalloc_section_memmap(void)
{
@@ -651,7 +649,6 @@ static void __kfree_section_memmap(struc
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;
@@ -681,7 +678,6 @@ static void free_map_bootmem(struct page
put_page_bootmem(page);
}
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/**
@@ -746,7 +742,6 @@ out:
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
#ifdef CONFIG_MEMORY_FAILURE
static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
{
@@ -823,5 +818,4 @@ void sparse_remove_one_section(struct zo
PAGES_PER_SECTION - map_offset);
free_section_usemap(memmap, usemap, altmap);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_MEMORY_HOTPLUG */
_
