Ashok Raj <[email protected]> wrote:
>
> When CONFIG_HOTPLUG_CPU is turned on we always use physflat mode (bigsmp) even
> when #of CPUs are less than 8 to avoid sending IPI to offline processors.
>
> Without having BIGSMP on it spits out a warning during boot on systems that
> seems misleading, since it complains even on systems that have less
> than 8 cpus.
>
> ...
>
> --- linux-2.6.16-rc6-mm1.orig/arch/i386/Kconfig
> +++ linux-2.6.16-rc6-mm1/arch/i386/Kconfig
> @@ -760,7 +760,7 @@ config PHYSICAL_START
>
> config HOTPLUG_CPU
> bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
> - depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
> + depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER && (X86_GENERICARCH || X86_BIGSMP)
> ---help---
> Say Y here to experiment with turning CPUs off and on. CPUs
> can be controlled through /sys/devices/system/cpu.
One of the main reasons for turning on CONFIG_HOTPLUG_CPU on x86 is
actually for suspend-to-disk on SMP. I don't think it's desirable to force
all those little machines to use X86_GENERICARCH || X86_BIGSMP. And it'd
be good to make that warning go away for 2.6.16.
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