mm: generalize ARCH_ENABLE_MEMORY_[HOTPLUG|HOTREMOVE]

ARCH_ENABLE_MEMORY_[HOTPLUG|HOTREMOVE] configs have duplicate
definitions on platforms that subscribe them.  Instead, just make them
generic options which can be selected on applicable platforms.

Link: https://lkml.kernel.org/r/1617259448-22529-4-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>	[arm64]
Acked-by: Heiko Carstens <hca@linux.ibm.com>		[s390]
Cc: Will Deacon <will@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm64/Kconfig

@@ -11,6 +11,8 @@ config ARM64
 	select ACPI_PPTT if ACPI
 	select ARCH_HAS_DEBUG_WX
 	select ARCH_BINFMT_ELF_STATE
+	select ARCH_ENABLE_MEMORY_HOTPLUG
+	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE
@@ -311,12 +313,6 @@ config ZONE_DMA32
 	bool "Support DMA32 zone" if EXPERT
 	default y
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-
 config SMP
 	def_bool y
 

arch/ia64/Kconfig

@@ -13,6 +13,8 @@ config IA64
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select ACPI
 	select ACPI_NUMA if NUMA
+	select ARCH_ENABLE_MEMORY_HOTPLUG
+	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_SUPPORTS_ACPI
 	select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
 	select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
@@ -246,12 +248,6 @@ config HOTPLUG_CPU
 	  can be controlled through /sys/devices/system/cpu/cpu#.
 	  Say N if you want to disable CPU hotplug.
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-
 config SCHED_SMT
 	bool "SMT scheduler support"
 	depends on SMP

arch/powerpc/Kconfig

@@ -118,6 +118,8 @@ config PPC
 	# Please keep this list sorted alphabetically.
 	#
 	select ARCH_32BIT_OFF_T if PPC32
+	select ARCH_ENABLE_MEMORY_HOTPLUG
+	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
@@ -512,12 +514,6 @@ config ARCH_CPU_PROBE_RELEASE
 	def_bool y
 	depends on HOTPLUG_CPU
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-
 config PPC64_SUPPORTS_MEMORY_FAILURE
 	bool "Add support for memory hwpoison"
 	depends on PPC_BOOK3S_64

arch/s390/Kconfig

@@ -60,6 +60,8 @@ config S390
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT
 	select ARCH_32BIT_USTAT_F_TINODE
 	select ARCH_BINFMT_ELF_STATE
+	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
+	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DEBUG_WX
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
@@ -626,12 +628,6 @@ config ARCH_SPARSEMEM_ENABLE
 config ARCH_SPARSEMEM_DEFAULT
 	def_bool y
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y if SPARSEMEM
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-
 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 	def_bool y
 

arch/sh/Kconfig

@@ -2,6 +2,8 @@
 config SUPERH
 	def_bool y
 	select ARCH_32BIT_OFF_T
+	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM && MMU
+	select ARCH_ENABLE_MEMORY_HOTREMOVE if SPARSEMEM && MMU
 	select ARCH_HAVE_CUSTOM_GPIO_H
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
 	select ARCH_HAS_BINFMT_FLAT if !MMU

arch/sh/mm/Kconfig

@@ -136,14 +136,6 @@ config ARCH_SPARSEMEM_DEFAULT
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y
-	depends on SPARSEMEM && MMU
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-	depends on SPARSEMEM && MMU
-
 config ARCH_MEMORY_PROBE
 	def_bool y
 	depends on MEMORY_HOTPLUG

arch/x86/Kconfig

@@ -60,6 +60,8 @@ config X86
 	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI
 	select ARCH_32BIT_OFF_T			if X86_32
 	select ARCH_CLOCKSOURCE_INIT
+	select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM)
+	select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
 	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_DEBUG_VIRTUAL
@@ -2427,14 +2429,6 @@ config ARCH_HAS_ADD_PAGES
 	def_bool y
 	depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
 
-config ARCH_ENABLE_MEMORY_HOTPLUG
-	def_bool y
-	depends on X86_64 || (X86_32 && HIGHMEM)
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
-	def_bool y
-	depends on MEMORY_HOTPLUG
-
 config USE_PERCPU_NUMA_NODE_ID
 	def_bool y
 	depends on NUMA

mm/Kconfig

@@ -148,6 +148,9 @@ config MEMORY_ISOLATION
 config HAVE_BOOTMEM_INFO_NODE
 	def_bool n
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+	bool
+
 # eventually, we can have this option just 'select SPARSEMEM'
 config MEMORY_HOTPLUG
 	bool "Allow for memory hot-add"
@@ -176,6 +179,9 @@ config MEMORY_HOTPLUG_DEFAULT_ONLINE
 	  Say N here if you want the default policy to keep all hot-plugged
 	  memory blocks in 'offline' state.
 
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+	bool
+
 config MEMORY_HOTREMOVE
 	bool "Allow for memory hot remove"
 	select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)