Messages in this thread | | | Date | Wed, 29 Mar 2006 15:09:51 -0800 | From | Ashok Raj <> | Subject | Re: [rfc] fix Kconfig, hotplug_cpu is needed for swsusp |
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On Wed, Mar 29, 2006 at 02:47:46PM -0800, Andrew Morton wrote: > Pavel Machek <pavel@ucw.cz> wrote: > > > > HOTPLUG_CPU is needed on normal PCs, too -- it is neccessary for > > software suspend. > > > > OK, this will get ugly. APICs are involved.
I guess you need only on systems that support >1 cpu right? I doubt you will need it on a system that cannot run with the config-generic-arch on. although we use bigsmp when hotplug is turned on, all we really end up is using flat physical mode instead of using logical mode.
I still havent understood why this wont work. Choosing CONFIG_X86_GENERICARCH shouldnt break anything AFAICT.
Pavel, you could use CONFIG_HOTPLUG_CPU, just need to enable X86_GENERICARCH now. Is there a reason you think that wont work? I wish we would revert it for a strong reason that we know will not make hotplug work on certain systems because of this choise not that we currently have X86_PC now, and are unwiling to change the config.
(PS: the word bigsmp although sounds like some large NR_CPUS, its just using a mode that permits the system to work from 1 .. >8 cpus. So there is really nothing determental to selecting this.)
-- Cheers, Ashok Raj - Open Source Technology Center - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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