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
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)
"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.
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
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
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.
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.
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++)
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)
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.
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
- depends on SMP && HOTPLUG
+ depends on SMP
default y
config BF_REV_MIN
config ETRAX_CARDBUS
bool "Cardbus support"
depends on ETRAX_ARCH_V32
- select HOTPLUG
help
Enabled the ETRAX Cardbus driver.
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
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.
config HOTPLUG_CPU
bool
default y if SMP
- select HOTPLUG
config ARCH_SELECT_MEMORY_MODEL
def_bool y
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
* 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)
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#.
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.
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#.
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.
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
#
menu "PCMCIA character devices"
- depends on HOTPLUG && PCMCIA!=n
+ depends on PCMCIA!=n
config SYNCLINK_CS
tristate "SyncLink PC Card support"
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.
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
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
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,
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
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
* 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)
the unaligned access emulation.
see arch/parisc/kernel/unaligned.c for reference
-config HOTPLUG
- def_bool y
-
config HAVE_PCSPKR_PLATFORM
bool
depends on SMP
depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
depends on PM_SLEEP
- select HOTPLUG
select HOTPLUG_CPU
config PM_AUTOSLEEP
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
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