Finally eradicate CONFIG_HOTPLUG

Ever since commit 45f035ab9b8f ("CONFIG_HOTPLUG should be always on"),
it has been basically impossible to build a kernel with CONFIG_HOTPLUG
turned off. Remove all the remaining references to it.

Cc: Russell King <[e-mail]>
Cc: Doug Thompson <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Steven Whitehouse <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Pavel Machek <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Signed-off-by: Stephen Rothwell <[e-mail]>
Acked-by: Mauro Carvalho Chehab <[e-mail]>
Acked-by: Hans Verkuil <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/ABI/testing/sysfs-bus-pci

···
 		Writing a non-zero value to this attribute will
 		force a rescan of all PCI buses in the system, and
 		re-discover previously removed devices.
-		Depends on CONFIG_HOTPLUG.
 
 What:		/sys/bus/pci/devices/.../msi_irqs/
 Date:		September, 2011
···
 Description:
 		Writing a non-zero value to this attribute will
 		hot-remove the PCI device and any of its children.
-		Depends on CONFIG_HOTPLUG.
 
 What:		/sys/bus/pci/devices/.../pci_bus/.../rescan
 Date:		May 2011
···
 		Writing a non-zero value to this attribute will
 		force a rescan of the bus and all child buses,
 		and re-discover devices removed earlier from this
-		part of the device tree.  Depends on CONFIG_HOTPLUG.
+		part of the device tree.
 
 What:		/sys/bus/pci/devices/.../rescan
 Date:		January 2009
···
 		force a rescan of the device's parent bus and all
 		child buses, and re-discover devices removed earlier
 		from this part of the device tree.
-		Depends on CONFIG_HOTPLUG.
 
 What:		/sys/bus/pci/devices/.../reset
 Date:		July 2009

Documentation/SubmitChecklist

···
     same time, just various/random combinations of them]:
 
     CONFIG_SMP, CONFIG_SYSFS, CONFIG_PROC_FS, CONFIG_INPUT, CONFIG_PCI,
-    CONFIG_BLOCK, CONFIG_PM, CONFIG_HOTPLUG, CONFIG_MAGIC_SYSRQ,
+    CONFIG_BLOCK, CONFIG_PM, CONFIG_MAGIC_SYSRQ,
     CONFIG_NET, CONFIG_INET=n (but latter with CONFIG_NET=y)

Documentation/cpu-hotplug.txt

···
 
    "Processor type and Features" -> Support for Hotpluggable CPUs
 
-Make sure that you have CONFIG_HOTPLUG, and CONFIG_SMP turned on as well.
+Make sure that you have CONFIG_SMP turned on as well.
 
 You would need to enable CONFIG_HOTPLUG_CPU for SMP suspend/resume support
 as well.

Documentation/hwmon/submitting-patches

···
   explicitly below the patch header.
 
 * If your patch (or the driver) is affected by configuration options such as
-  CONFIG_SMP or CONFIG_HOTPLUG, make sure it compiles for all configuration
-  variants.
+  CONFIG_SMP, make sure it compiles for all configuration variants.
 
 
 2. Adding functionality to existing drivers

Documentation/kbuild/kconfig.txt

···
 	Example:
 		/hotplug
 		This lists all config symbols that contain "hotplug",
-		e.g., HOTPLUG, HOTPLUG_CPU, MEMORY_HOTPLUG.
+		e.g., HOTPLUG_CPU, MEMORY_HOTPLUG.
 
 	For search help, enter / followed TAB-TAB-TAB (to highlight
 	<Help>) and Enter.  This will tell you that you can also use

Documentation/usb/hotplug.txt

···
 
 KERNEL HOTPLUG HELPER (/sbin/hotplug)
 
-When you compile with CONFIG_HOTPLUG, you get a new kernel parameter:
-/proc/sys/kernel/hotplug, which normally holds the pathname "/sbin/hotplug".
-That parameter names a program which the kernel may invoke at various times.
+There is a kernel parameter: /proc/sys/kernel/hotplug, which normally
+holds the pathname "/sbin/hotplug".  That parameter names a program
+which the kernel may invoke at various times.
 
 The /sbin/hotplug program can be invoked by any subsystem as part of its
 reaction to a configuration change, from a thread in that subsystem.

arch/arm/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
-	depends on SMP && HOTPLUG
+	depends on SMP
 	help
 	  Say Y here to experiment with turning CPUs off and on.  CPUs
 	  can be controlled through /sys/devices/system/cpu.

arch/arm/kernel/module.c

···
 
 		if (strcmp(".ARM.exidx.init.text", secname) == 0)
 			maps[ARM_SEC_INIT].unw_sec = s;
-		else if (strcmp(".ARM.exidx.devinit.text", secname) == 0)
-			maps[ARM_SEC_DEVINIT].unw_sec = s;
 		else if (strcmp(".ARM.exidx", secname) == 0)
 			maps[ARM_SEC_CORE].unw_sec = s;
 		else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
 			maps[ARM_SEC_EXIT].unw_sec = s;
-		else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)
-			maps[ARM_SEC_DEVEXIT].unw_sec = s;
 		else if (strcmp(".init.text", secname) == 0)
 			maps[ARM_SEC_INIT].txt_sec = s;
-		else if (strcmp(".devinit.text", secname) == 0)
-			maps[ARM_SEC_DEVINIT].txt_sec = s;
 		else if (strcmp(".text", secname) == 0)
 			maps[ARM_SEC_CORE].txt_sec = s;
 		else if (strcmp(".exit.text", secname) == 0)
 			maps[ARM_SEC_EXIT].txt_sec = s;
-		else if (strcmp(".devexit.text", secname) == 0)
-			maps[ARM_SEC_DEVEXIT].txt_sec = s;
 	}
 
 	for (i = 0; i < ARM_SEC_MAX; i++)

arch/arm/kernel/vmlinux.lds.S

···
 		ARM_EXIT_DISCARD(EXIT_TEXT)
 		ARM_EXIT_DISCARD(EXIT_DATA)
 		EXIT_CALL
-#ifndef CONFIG_HOTPLUG
-		*(.ARM.exidx.devexit.text)
-		*(.ARM.extab.devexit.text)
-#endif
 #ifndef CONFIG_MMU
 		*(.fixup)
 		*(__ex_table)

arch/arm/mach-ixp4xx/Kconfig

···
 config IXP4XX_NPE
 	tristate "IXP4xx Network Processor Engine support"
 	select FW_LOADER
-	select HOTPLUG
 	help
 	  This driver supports IXP4xx built-in network coprocessors
 	  and is automatically selected by Ethernet and HSS drivers.

arch/blackfin/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
-	depends on SMP && HOTPLUG
+	depends on SMP
 	default y
 
 config BF_REV_MIN

arch/cris/arch-v32/drivers/Kconfig

···
 config ETRAX_CARDBUS
         bool "Cardbus support"
         depends on ETRAX_ARCH_V32
-        select HOTPLUG
         help
 	 Enabled the ETRAX Cardbus driver.
 

arch/ia64/Kconfig

···
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
 	depends on SMP
-	select HOTPLUG
 	default n
 	---help---
 	  Say Y here to experiment with turning CPUs off and on.  CPUs

arch/mips/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
-	depends on SMP && HOTPLUG && SYS_SUPPORTS_HOTPLUG_CPU
+	depends on SMP && SYS_SUPPORTS_HOTPLUG_CPU
 	help
 	  Say Y here to allow turning CPUs off and on. CPUs can be
 	  controlled through /sys/devices/system/cpu.

arch/parisc/Kconfig

···
 config HOTPLUG_CPU
 	bool
 	default y if SMP
-	select HOTPLUG
 
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y

arch/powerpc/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for enabling/disabling CPUs"
-	depends on SMP && HOTPLUG && (PPC_PSERIES || \
+	depends on SMP && (PPC_PSERIES || \
 	PPC_PMAC || PPC_POWERNV || (PPC_85xx && !PPC_E500MC))
 	---help---
 	  Say Y here to be able to disable and re-enable individual

arch/powerpc/mm/tlb_hash64.c

···
  * since 64K pages may overlap with other bridges when using 64K pages
  * with 4K HW pages on IO space.
  *
- * Because of that usage pattern, it's only available with CONFIG_HOTPLUG
- * and is implemented for small size rather than speed.
+ * Because of that usage pattern, it is implemented for small size rather
+ * than speed.
  */
 void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
 			      unsigned long end)

arch/s390/Kconfig

···
 	def_bool y
 	prompt "Support for hot-pluggable CPUs"
 	depends on SMP
-	select HOTPLUG
 	help
 	  Say Y here to be able to turn CPUs off and on. CPUs
 	  can be controlled through /sys/devices/system/cpu/cpu#.

arch/sh/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
-	depends on SMP && HOTPLUG
+	depends on SMP
 	help
 	  Say Y here to experiment with turning CPUs off and on.  CPUs
 	  can be controlled through /sys/devices/system/cpu.

arch/sparc/Kconfig

···
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
 	depends on SPARC64 && SMP
-	select HOTPLUG
 	help
 	  Say Y here to experiment with turning CPUs off and on.  CPUs
 	  can be controlled through /sys/devices/system/cpu/cpu#.

arch/x86/Kconfig

···
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
-	depends on SMP && HOTPLUG
+	depends on SMP
 	---help---
 	  Say Y here to allow turning CPUs off and on. CPUs can be
 	  controlled through /sys/devices/system/cpu.

drivers/base/Kconfig

···
 
 config UEVENT_HELPER_PATH
 	string "path to uevent helper"
-	depends on HOTPLUG
 	default ""
 	help
 	  Path to uevent helper program forked by the kernel for
···
 
 config DEVTMPFS
 	bool "Maintain a devtmpfs filesystem to mount at /dev"
-	depends on HOTPLUG
 	help
 	  This creates a tmpfs/ramfs filesystem instance early at bootup.
 	  In this filesystem, the kernel driver core maintains device

drivers/char/pcmcia/Kconfig

···
 #
 
 menu "PCMCIA character devices"
-	depends on HOTPLUG && PCMCIA!=n
+	depends on PCMCIA!=n
 
 config SYNCLINK_CS
 	tristate "SyncLink PC Card support"

drivers/edac/Kconfig

···
 
 config EDAC_E752X
 	tristate "Intel e752x (e7520, e7525, e7320) and 3100"
-	depends on EDAC_MM_EDAC && PCI && X86 && HOTPLUG
+	depends on EDAC_MM_EDAC && PCI && X86
 	help
 	  Support for error detection and correction on the Intel
 	  E7520, E7525, E7320 server chipsets.

drivers/pci/Kconfig

···
 config XEN_PCIDEV_FRONTEND
         tristate "Xen PCI Frontend"
         depends on PCI && X86 && XEN
-        select HOTPLUG
         select PCI_XEN
 	select XEN_XENBUS_FRONTEND
         default y
···
 	tristate "PCI IO-APIC hotplug support" if X86
 	depends on PCI
 	depends on ACPI
-	depends on HOTPLUG
 	default !X86
 
 config PCI_LABEL

drivers/pci/hotplug/Kconfig

···
 
 menuconfig HOTPLUG_PCI
 	tristate "Support for PCI Hotplug"
-	depends on PCI && HOTPLUG && SYSFS
+	depends on PCI && SYSFS
 	---help---
 	  Say Y here if you have a motherboard with a PCI Hotplug controller.
 	  This allows you to add and remove PCI cards while the machine is

drivers/pcmcia/Kconfig

···
 
 menuconfig PCCARD
 	tristate "PCCard (PCMCIA/CardBus) support"
-	depends on HOTPLUG
 	---help---
 	  Say Y here if you want to attach PCMCIA- or PC-cards to your Linux
 	  computer.  These are credit-card size devices such as network cards,

drivers/staging/media/go7007/go7007.txt

···
 for custom-built kernels, the following options need to be enabled in the
 kernel as built-in or modules:
 
-	CONFIG_HOTPLUG           - Support for hot-pluggable devices
 	CONFIG_MODULES           - Enable loadable module support
 	CONFIG_KMOD              - Automatic kernel module loading
 	CONFIG_FW_LOADER         - Hotplug firmware loading support

fs/gfs2/Kconfig

···
 	  be found here: http://sources.redhat.com/cluster
 
 	  The "nolock" lock module is now built in to GFS2 by default. If
-	  you want to use the DLM, be sure to enable HOTPLUG and IPv4/6
-	  networking.
+	  you want to use the DLM, be sure to enable IPv4/6 networking.
 
 config GFS2_FS_LOCKING_DLM
 	bool "GFS2 DLM locking"
 	depends on (GFS2_FS!=n) && NET && INET && (IPV6 || IPV6=n) && \
-		HOTPLUG && CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS)
+		CONFIGFS_FS && SYSFS && (DLM=y || DLM=GFS2_FS)
 	help
 	  Multiple node locking module for GFS2
 

include/asm-generic/vmlinux.lds.h

···
  * are handled as text/data or they can be discarded (which
  * often happens at runtime)
  */
-#ifdef CONFIG_HOTPLUG
-#define DEV_KEEP(sec)    *(.dev##sec)
-#define DEV_DISCARD(sec)
-#else
-#define DEV_KEEP(sec)
-#define DEV_DISCARD(sec) *(.dev##sec)
-#endif
-
 #ifdef CONFIG_HOTPLUG_CPU
 #define CPU_KEEP(sec)    *(.cpu##sec)
 #define CPU_DISCARD(sec)
···
 	*(.data)							\
 	*(.ref.data)							\
 	*(.data..shared_aligned) /* percpu related */			\
-	DEV_KEEP(init.data)						\
-	DEV_KEEP(exit.data)						\
 	CPU_KEEP(init.data)						\
 	CPU_KEEP(exit.data)						\
 	MEM_KEEP(init.data)						\
···
 	/* __*init sections */						\
 	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
 		*(.ref.rodata)						\
-		DEV_KEEP(init.rodata)					\
-		DEV_KEEP(exit.rodata)					\
 		CPU_KEEP(init.rodata)					\
 		CPU_KEEP(exit.rodata)					\
 		MEM_KEEP(init.rodata)					\
···
 		*(.text.hot)						\
 		*(.text)						\
 		*(.ref.text)						\
-	DEV_KEEP(init.text)						\
-	DEV_KEEP(exit.text)						\
 	CPU_KEEP(init.text)						\
 	CPU_KEEP(exit.text)						\
 	MEM_KEEP(init.text)						\
···
 /* init and exit section handling */
 #define INIT_DATA							\
 	*(.init.data)							\
-	DEV_DISCARD(init.data)						\
 	CPU_DISCARD(init.data)						\
 	MEM_DISCARD(init.data)						\
 	KERNEL_CTORS()							\
···
 	*(.init.rodata)							\
 	FTRACE_EVENTS()							\
 	TRACE_SYSCALLS()						\
-	DEV_DISCARD(init.rodata)					\
 	CPU_DISCARD(init.rodata)					\
 	MEM_DISCARD(init.rodata)					\
 	CLK_OF_TABLES()							\
···
 
 #define INIT_TEXT							\
 	*(.init.text)							\
-	DEV_DISCARD(init.text)						\
 	CPU_DISCARD(init.text)						\
 	MEM_DISCARD(init.text)
 
 #define EXIT_DATA							\
 	*(.exit.data)							\
-	DEV_DISCARD(exit.data)						\
-	DEV_DISCARD(exit.rodata)					\
 	CPU_DISCARD(exit.data)						\
 	CPU_DISCARD(exit.rodata)					\
 	MEM_DISCARD(exit.data)						\
···
 
 #define EXIT_TEXT							\
 	*(.exit.text)							\
-	DEV_DISCARD(exit.text)						\
 	CPU_DISCARD(exit.text)						\
 	MEM_DISCARD(exit.text)
 

init/Kconfig

···
 	  the unaligned access emulation.
 	  see arch/parisc/kernel/unaligned.c for reference
 
-config HOTPLUG
-	def_bool y
-
 config HAVE_PCSPKR_PLATFORM
 	bool
 

kernel/power/Kconfig

···
 	depends on SMP
 	depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
 	depends on PM_SLEEP
-	select HOTPLUG
 	select HOTPLUG_CPU
 
 config PM_AUTOSLEEP

mm/Kconfig

···
 config MEMORY_HOTPLUG
 	bool "Allow for memory hot-add"
 	depends on SPARSEMEM || X86_64_ACPI_NUMA
-	depends on HOTPLUG && ARCH_ENABLE_MEMORY_HOTPLUG
+	depends on ARCH_ENABLE_MEMORY_HOTPLUG
 	depends on (IA64 || X86 || PPC_BOOK3S_64 || SUPERH || S390)
 
 config MEMORY_HOTPLUG_SPARSE