[PATCH v2 3/8] mm/memory_hotplug: arch_remove_memory() and __remove_pages() with CONFIG_MEMORY_HOTPLUG
David Hildenbrand
david at redhat.com
Wed May 8 04:37:59 AEST 2019
Let's prepare for better error handling while adding memory by allowing
to use arch_remove_memory() and __remove_pages() even if
CONFIG_MEMORY_HOTREMOVE is not set. CONFIG_MEMORY_HOTREMOVE effectively
covers
- Offlining of system ram (memory block devices) - offline_pages()
- Unplug of system ram - remove_memory()
- Unplug/remap of device memory - devm_memremap()
This allows e.g. for handling like
arch_add_memory()
rc = do_something();
if (rc) {
arch_remove_memory();
}
Whereby do_something() will for example be memory block device creation
after it has been factored out.
Cc: Tony Luck <tony.luck at intel.com>
Cc: Fenghua Yu <fenghua.yu at intel.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
Cc: Yoshinori Sato <ysato at users.sourceforge.jp>
Cc: Rich Felker <dalias at libc.org>
Cc: Dave Hansen <dave.hansen at linux.intel.com>
Cc: Andy Lutomirski <luto at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Borislav Petkov <bp at alien8.de>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael at kernel.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Michal Hocko <mhocko at suse.com>
Cc: Mike Rapoport <rppt at linux.ibm.com>
Cc: David Hildenbrand <david at redhat.com>
Cc: Oscar Salvador <osalvador at suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov at linux.intel.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Mark Brown <broonie at kernel.org>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Christophe Leroy <christophe.leroy at c-s.fr>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Vasily Gorbik <gor at linux.ibm.com>
Cc: Rob Herring <robh at kernel.org>
Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
Cc: "mike.travis at hpe.com" <mike.travis at hpe.com>
Cc: Andrew Banman <andrew.banman at hpe.com>
Cc: Pavel Tatashin <pasha.tatashin at soleen.com>
Cc: Wei Yang <richardw.yang at linux.intel.com>
Cc: Arun KS <arunks at codeaurora.org>
Cc: Qian Cai <cai at lca.pw>
Cc: Mathieu Malaterre <malat at debian.org>
Cc: Baoquan He <bhe at redhat.com>
Cc: Logan Gunthorpe <logang at deltatee.com>
Signed-off-by: David Hildenbrand <david at redhat.com>
---
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 d28e29103bdb..aae75fd7b810 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -681,7 +681,6 @@ int arch_add_memory(int nid, u64 start, u64 size,
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 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 a2b78e72452f..ddc69b59575c 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -131,7 +131,6 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
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)
{
@@ -164,7 +163,6 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
resize_hpt_for_hotplug(memblock_phys_mem_size());
}
#endif
-#endif /* CONFIG_MEMORY_HOTPLUG */
#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init mem_topology_setup(void)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 1e0cbae69f12..eafa3c750efc 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -233,7 +233,6 @@ int arch_add_memory(int nid, u64 start, u64 size,
return rc;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{
@@ -245,5 +244,4 @@ 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 5aeb4d7099a1..59c5fe511f25 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -428,7 +428,6 @@ 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)
{
@@ -439,5 +438,4 @@ 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 075e568098f2..8d4bf2d97d50 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -859,7 +859,6 @@ int arch_add_memory(int nid, u64 start, u64 size,
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)
{
@@ -871,7 +870,6 @@ 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 20d14254b686..f1b55ddea23f 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1131,7 +1131,6 @@ 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)
{
@@ -1156,7 +1155,6 @@ 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 f180427e48f4..6e0cb4fda179 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -728,7 +728,6 @@ int hotplug_memory_register(int nid, struct mem_section *section)
return ret;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void
unregister_memory(struct memory_block *memory)
{
@@ -767,7 +766,6 @@ 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 ae892eef8b82..2d4de313926d 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -123,12 +123,10 @@ 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 */
/*
* Do we want sysfs memblock files created. This will allow userspace to online
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 202febe88b58..7b5439839d67 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -317,7 +317,6 @@ 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,
@@ -581,7 +580,6 @@ 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 fd13166949b5..d1d5e05f5b8d 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -604,7 +604,6 @@ 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;
@@ -612,7 +611,6 @@ 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)
{
@@ -651,7 +649,6 @@ 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;
@@ -681,7 +678,6 @@ static void free_map_bootmem(struct page *memmap)
put_page_bootmem(page);
}
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/**
@@ -746,7 +742,6 @@ 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)
{
@@ -823,5 +818,4 @@ 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 */
--
2.20.1
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