i386, x86-64: show that CONFIG_HOTPLUG_CPU is required for suspend on SMP
PATCH 1/1 i386, x86-64: show that CONFIG_HOTPLUG_CPU is required for suspend on SMP
From: Stefan Richter <[email protected]>
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 <[email protected]>
Signed-off-by Rafael J. Wysocki <[email protected]>
--- arch/i386/Kconfig | 2 +- arch/x86_64/Kconfig | 7 +++++-- 2 files changed, 6 insertions(+), 3 deletions(-)
arch/i386/Kconfig +1 -1
@@ -891,7 +891,7 @@ config PHYSICAL_ALIGN Don't change this unless you know what you are doing. 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 ---help--- Say Y here to experiment with turning CPUs off and on, and to
arch/x86_64/Kconfig +5 -2
@@ -428,12 +428,15 @@ config NR_CPUS memory in the static kernel configuration. 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 help Say Y here to experiment with turning CPUs off and on. CPUs 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 def_bool y