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@redhat.com Signed-off-by: David Hildenbrand david@redhat.com Reviewed-by: Pavel Tatashin pasha.tatashin@soleen.com Cc: Tony Luck tony.luck@intel.com Cc: Fenghua Yu fenghua.yu@intel.com Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Cc: Paul Mackerras paulus@samba.org Cc: Michael Ellerman mpe@ellerman.id.au Cc: Heiko Carstens heiko.carstens@de.ibm.com Cc: Yoshinori Sato ysato@users.sourceforge.jp Cc: Rich Felker dalias@libc.org Cc: Dave Hansen dave.hansen@linux.intel.com Cc: Andy Lutomirski luto@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Borislav Petkov bp@alien8.de Cc: "H. Peter Anvin" hpa@zytor.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: "Rafael J. Wysocki" rafael@kernel.org Cc: Michal Hocko mhocko@suse.com Cc: David Hildenbrand david@redhat.com Cc: Oscar Salvador osalvador@suse.com Cc: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Cc: Alex Deucher alexander.deucher@amd.com Cc: "David S. Miller" davem@davemloft.net Cc: Mark Brown broonie@kernel.org Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Christophe Leroy christophe.leroy@c-s.fr Cc: Nicholas Piggin npiggin@gmail.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Rob Herring robh@kernel.org Cc: Masahiro Yamada yamada.masahiro@socionext.com Cc: "mike.travis@hpe.com" mike.travis@hpe.com Cc: Andrew Banman andrew.banman@hpe.com Cc: Arun KS arunks@codeaurora.org Cc: Qian Cai cai@lca.pw Cc: Mathieu Malaterre malat@debian.org Cc: Baoquan He bhe@redhat.com Cc: Logan Gunthorpe logang@deltatee.com Cc: Anshuman Khandual anshuman.khandual@arm.com Cc: Ard Biesheuvel ard.biesheuvel@linaro.org Cc: Catalin Marinas catalin.marinas@arm.com Cc: Chintan Pandya cpandya@codeaurora.org Cc: Dan Williams dan.j.williams@intel.com Cc: Ingo Molnar mingo@kernel.org Cc: Jonathan Cameron Jonathan.Cameron@huawei.com Cc: Joonsoo Kim iamjoonsoo.kim@lge.com Cc: Jun Yao yaojun8558363@gmail.com Cc: Mark Rutland mark.rutland@arm.com Cc: Mike Rapoport rppt@linux.vnet.ibm.com Cc: Oscar Salvador osalvador@suse.de Cc: Robin Murphy robin.murphy@arm.com Cc: Wei Yang richard.weiyang@gmail.com Cc: Will Deacon will.deacon@arm.com Cc: Yu Zhao yuzhao@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: David Hildenbrand david@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 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 */