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Date: Sun, 20 May 2007 21:29:26 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Andrew Morton <akpm@...ux-foundation.org> Cc: LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>, Stefan Richter <stefanr@...6.in-berlin.de>, Sam Ravnborg <sam@...nborg.org>, Andi Kleen <ak@...e.de> Subject: [PATCH] i386, x86-64: show that CONFIG_HOTPLUG_CPU is required for suspend on SMP From: Stefan Richter <stefanr@...6.in-berlin.de> 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@...6.in-berlin.de> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl> --- arch/i386/Kconfig | 2 +- arch/x86_64/Kconfig | 7 +++++-- 2 files changed, 6 insertions(+), 3 deletions(-) Index: linux-2.6.22-rc2/arch/i386/Kconfig =================================================================== --- linux-2.6.22-rc2.orig/arch/i386/Kconfig +++ linux-2.6.22-rc2/arch/i386/Kconfig @@ -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 Index: linux-2.6.22-rc2/arch/x86_64/Kconfig =================================================================== --- linux-2.6.22-rc2.orig/arch/x86_64/Kconfig +++ linux-2.6.22-rc2/arch/x86_64/Kconfig @@ -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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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