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From:   David Hildenbrand <david@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     David Hildenbrand <david@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>, Alex Shi <alexs@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
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        Paul Mackerras <paulus@samba.org>,
        Thomas Gleixner <tglx@linutronix.de>,
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        "H. Peter Anvin" <hpa@zytor.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
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        Shuah Khan <shuah@kernel.org>, Michal Hocko <mhocko@suse.com>,
        Oscar Salvador <osalvador@suse.de>,
        Mike Rapoport <rppt@kernel.org>, x86@kernel.org,
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Subject: [PATCH v1 2/6] mm/memory_hotplug: remove CONFIG_MEMORY_HOTPLUG_SPARSE
Date:   Wed, 29 Sep 2021 16:35:56 +0200
Message-Id: <20210929143600.49379-3-david@redhat.com>
In-Reply-To: <20210929143600.49379-1-david@redhat.com>
References: <20210929143600.49379-1-david@redhat.com>
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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@redhat.com>
---
 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