Re: [PATCH v1 2/6] mm/memory_hotplug: remove CONFIG_MEMORY_HOTPLUG_SPARSE

From: Oscar Salvador
Date: Thu Oct 07 2021 - 04:20:46 EST

On Wed, Sep 29, 2021 at 04:35:56PM +0200, David Hildenbrand wrote:
> CONFIG_MEMORY_HOTPLUG depends on CONFIG_SPARSEMEM, so there is no need for
> CONFIG_MEMORY_HOTPLUG_SPARSE anymore; adjust all instances to use
> CONFIG_MEMORY_HOTPLUG and remove CONFIG_MEMORY_HOTPLUG_SPARSE.
>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

Acked-by: Oscar Salvador <osalvador@xxxxxxx>

> ---
> arch/powerpc/include/asm/machdep.h | 2 +-
> arch/powerpc/kernel/setup_64.c | 2 +-
> arch/powerpc/platforms/powernv/setup.c | 4 ++--
> arch/powerpc/platforms/pseries/setup.c | 2 +-
> drivers/base/Makefile | 2 +-
> drivers/base/node.c | 9 ++++-----
> drivers/virtio/Kconfig | 2 +-
> include/linux/memory.h | 18 +++++++-----------
> include/linux/node.h | 4 ++--
> lib/Kconfig.debug | 2 +-
> mm/Kconfig | 4 ----
> mm/memory_hotplug.c | 2 --
> tools/testing/selftests/memory-hotplug/config | 1 -
> 13 files changed, 21 insertions(+), 33 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
> index 764f2732a821..d8a2ca007082 100644
> --- a/arch/powerpc/include/asm/machdep.h
> +++ b/arch/powerpc/include/asm/machdep.h
> @@ -32,7 +32,7 @@ struct machdep_calls {
> void (*iommu_save)(void);
> void (*iommu_restore)(void);
> #endif
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> unsigned long (*memory_block_size)(void);
> #endif
> #endif /* CONFIG_PPC64 */
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index eaa79a0996d1..21f15d82f062 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -912,7 +912,7 @@ void __init setup_per_cpu_areas(void)
> }
> #endif
>
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> unsigned long memory_block_size_bytes(void)
> {
> if (ppc_md.memory_block_size)
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index a8db3f153063..ad56a54ac9c5 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -440,7 +440,7 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
> }
> #endif /* CONFIG_KEXEC_CORE */
>
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> static unsigned long pnv_memory_block_size(void)
> {
> /*
> @@ -553,7 +553,7 @@ define_machine(powernv) {
> #ifdef CONFIG_KEXEC_CORE
> .kexec_cpu_down = pnv_kexec_cpu_down,
> #endif
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> .memory_block_size = pnv_memory_block_size,
> #endif
> };
> diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
> index f79126f16258..d29f6f1f7f37 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -1089,7 +1089,7 @@ define_machine(pseries) {
> .machine_kexec = pSeries_machine_kexec,
> .kexec_cpu_down = pseries_kexec_cpu_down,
> #endif
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> .memory_block_size = pseries_memory_block_size,
> #endif
> };
> diff --git a/drivers/base/Makefile b/drivers/base/Makefile
> index ef8e44a7d288..02f7f1358e86 100644
> --- a/drivers/base/Makefile
> +++ b/drivers/base/Makefile
> @@ -13,7 +13,7 @@ obj-y += power/
> obj-$(CONFIG_ISA_BUS_API) += isa.o
> obj-y += firmware_loader/
> obj-$(CONFIG_NUMA) += node.o
> -obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o
> +obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o
> ifeq ($(CONFIG_SYSFS),y)
> obj-$(CONFIG_MODULES) += module.o
> endif
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index c56d34f8158f..b5a4ba18f9f9 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -629,7 +629,7 @@ static void node_device_release(struct device *dev)
> {
> struct node *node = to_node(dev);
>
> -#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
> +#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_HUGETLBFS)
> /*
> * We schedule the work only when a memory section is
> * onlined/offlined on this node. When we come here,
> @@ -782,7 +782,7 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
> return 0;
> }
>
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifdef CONFIG_MEMORY_HOTPLUG
> static int __ref get_nid_for_pfn(unsigned long pfn)
> {
> #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
> @@ -958,10 +958,9 @@ static int node_memory_callback(struct notifier_block *self,
> return NOTIFY_OK;
> }
> #endif /* CONFIG_HUGETLBFS */
> -#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
> +#endif /* CONFIG_MEMORY_HOTPLUG */
>
> -#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
> - !defined(CONFIG_HUGETLBFS)
> +#if !defined(CONFIG_MEMORY_HOTPLUG) || !defined(CONFIG_HUGETLBFS)
> static inline int node_memory_callback(struct notifier_block *self,
> unsigned long action, void *arg)
> {
> diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> index ce1b3f6ec325..3654def9915c 100644
> --- a/drivers/virtio/Kconfig
> +++ b/drivers/virtio/Kconfig
> @@ -98,7 +98,7 @@ config VIRTIO_MEM
> default m
> depends on X86_64
> depends on VIRTIO
> - depends on MEMORY_HOTPLUG_SPARSE
> + depends on MEMORY_HOTPLUG
> depends on MEMORY_HOTREMOVE
> depends on CONTIG_ALLOC
> help
> diff --git a/include/linux/memory.h b/include/linux/memory.h
> index 7efc0a7c14c9..dd6e608c3e0b 100644
> --- a/include/linux/memory.h
> +++ b/include/linux/memory.h
> @@ -110,7 +110,7 @@ struct mem_section;
> #define SLAB_CALLBACK_PRI 1
> #define IPC_CALLBACK_PRI 10
>
> -#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
> +#ifndef CONFIG_MEMORY_HOTPLUG
> static inline void memory_dev_init(void)
> {
> return;
> @@ -126,7 +126,11 @@ static inline int memory_notify(unsigned long val, void *v)
> {
> return 0;
> }
> -#else
> +#define hotplug_memory_notifier(fn, pri) ({ 0; })
> +/* These aren't inline functions due to a GCC bug. */
> +#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
> +#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
> +#else /* CONFIG_MEMORY_HOTPLUG */
> extern int register_memory_notifier(struct notifier_block *nb);
> extern void unregister_memory_notifier(struct notifier_block *nb);
> int create_memory_block_devices(unsigned long start, unsigned long size,
> @@ -149,9 +153,6 @@ struct memory_group *memory_group_find_by_id(int mgid);
> typedef int (*walk_memory_groups_func_t)(struct memory_group *, void *);
> int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
> struct memory_group *excluded, void *arg);
> -#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
> -
> -#ifdef CONFIG_MEMORY_HOTPLUG
> #define hotplug_memory_notifier(fn, pri) ({ \
> static __meminitdata struct notifier_block fn##_mem_nb =\
> { .notifier_call = fn, .priority = pri };\
> @@ -159,12 +160,7 @@ int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
> })
> #define register_hotmemory_notifier(nb) register_memory_notifier(nb)
> #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
> -#else
> -#define hotplug_memory_notifier(fn, pri) ({ 0; })
> -/* These aren't inline functions due to a GCC bug. */
> -#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
> -#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
> -#endif
> +#endif /* CONFIG_MEMORY_HOTPLUG */
>
> /*
> * Kernel text modification mutex, used for code patching. Users of this lock
> diff --git a/include/linux/node.h b/include/linux/node.h
> index 8e5a29897936..bb21fd631b16 100644
> --- a/include/linux/node.h
> +++ b/include/linux/node.h
> @@ -85,7 +85,7 @@ struct node {
> struct device dev;
> struct list_head access_list;
>
> -#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
> +#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_HUGETLBFS)
> struct work_struct node_work;
> #endif
> #ifdef CONFIG_HMEM_REPORTING
> @@ -98,7 +98,7 @@ struct memory_block;
> extern struct node *node_devices[];
> typedef void (*node_registration_func_t)(struct node *);
>
> -#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
> +#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA)
> void link_mem_sections(int nid, unsigned long start_pfn,
> unsigned long end_pfn,
> enum meminit_context context);
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 2a9b6dcdac4f..669fee1d26b8 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -877,7 +877,7 @@ config DEBUG_MEMORY_INIT
>
> config MEMORY_NOTIFIER_ERROR_INJECT
> tristate "Memory hotplug notifier error injection module"
> - depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
> + depends on MEMORY_HOTPLUG && NOTIFIER_ERROR_INJECTION
> help
> This option provides the ability to inject artificial errors to
> memory hotplug notifier chain callbacks. It is controlled through
> diff --git a/mm/Kconfig b/mm/Kconfig
> index b7fb3f0b485e..ea8762cd8e1e 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -128,10 +128,6 @@ config MEMORY_HOTPLUG
> depends on 64BIT || BROKEN
> select NUMA_KEEP_MEMINFO if NUMA
>
> -config MEMORY_HOTPLUG_SPARSE
> - def_bool y
> - depends on SPARSEMEM && MEMORY_HOTPLUG
> -
> config MEMORY_HOTPLUG_DEFAULT_ONLINE
> bool "Online the newly added memory blocks by default"
> depends on MEMORY_HOTPLUG
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 9fd0be32a281..8d7b2b593a26 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -220,7 +220,6 @@ static void release_memory_resource(struct resource *res)
> kfree(res);
> }
>
> -#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
> const char *reason)
> {
> @@ -1163,7 +1162,6 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
> mem_hotplug_done();
> return ret;
> }
> -#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
>
> static void reset_node_present_pages(pg_data_t *pgdat)
> {
> diff --git a/tools/testing/selftests/memory-hotplug/config b/tools/testing/selftests/memory-hotplug/config
> index a7e8cd5bb265..1eef042a31e1 100644
> --- a/tools/testing/selftests/memory-hotplug/config
> +++ b/tools/testing/selftests/memory-hotplug/config
> @@ -1,5 +1,4 @@
> CONFIG_MEMORY_HOTPLUG=y
> -CONFIG_MEMORY_HOTPLUG_SPARSE=y
> CONFIG_NOTIFIER_ERROR_INJECTION=y
> CONFIG_MEMORY_NOTIFIER_ERROR_INJECT=m
> CONFIG_MEMORY_HOTREMOVE=y
> --
> 2.31.1
>
>

--
Oscar Salvador
SUSE Labs