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i386, x86-64: show that CONFIG_HOTPLUG_CPU is required for suspend on SMP 

It's not sufficiently documented that CONFIG_HOTPLUG_CPU is required for
suspend/hibernation on SMP.

Point out the non-obvious.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefan Richter 2007-05-23 13:58:08 -07:00 committed by Linus Torvalds
parent 82cd0e8410
commit 1dbf37e8ad
2 changed files with 6 additions and 3 deletions
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2
arch/i386/Kconfig
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@ -891,7 +891,7 @@ config PHYSICAL_ALIGN
Don't change this unless you know what you are doing. Don't change this unless you know what you are doing.
config HOTPLUG_CPU config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
---help--- ---help---
Say Y here to experiment with turning CPUs off and on, and to Say Y here to experiment with turning CPUs off and on, and to

7
arch/x86_64/Kconfig
View File

@ -428,12 +428,15 @@ config NR_CPUS
memory in the static kernel configuration. memory in the static kernel configuration.
config HOTPLUG_CPU config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
depends on SMP && HOTPLUG && EXPERIMENTAL depends on SMP && HOTPLUG && EXPERIMENTAL
help help
Say Y here to experiment with turning CPUs off and on. CPUs Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu/cpu#. can be controlled through /sys/devices/system/cpu/cpu#.
Say N if you want to disable CPU hotplug. This is also required for suspend/hibernation on SMP systems.
Say N if you want to disable CPU hotplug and don't need to
suspend.
config ARCH_ENABLE_MEMORY_HOTPLUG config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y def_bool y