From: Valdis.Kletnieks@vt.edu
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>,
Suresh Siddha <suresh.b.siddha@intel.com>,
"ananth@in.ibm.com" <ananth@in.ibm.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 2/4] x86: use dmi check to treat disabled cpus as hotplug cpus.
Date: Tue, 12 Jan 2010 11:14:34 -0500 [thread overview]
Message-ID: <6686.1263312874@localhost> (raw)
In-Reply-To: Your message of "Mon, 11 Jan 2010 19:13:32 PST." <alpine.LFD.2.00.1001111906300.17145@localhost.localdomain>
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On Mon, 11 Jan 2010 19:13:32 PST, Linus Torvalds said:
> - only use that flat apic mode when you _know_ that you absolutely will
> never have more than 8 cpu's. Ie when CONFIG_NR_CPUS <= 8 (or, with
> 1/3, when nr_cpu_ids <= 8) and/or when <= 8 CPU's were detected, and
> CPU hotplug is disabled entirely.
OK, I'll bite - how do you build an X86-64 kernel that doesn't have
CONFIG_HOTPLUG_CPU selected? Try as I might, even if I have PM_SLEEP=n,
PM_SLEEP_SMP insists on being set, and then selecting HOTPLUG_SMP. For the
record, I do *not* need/desire S2R, S2D, 'suspend', or similar functionality.
Is there some subtle reason why PM_SLEEP_SMP has to be on even without PM_SLEEP?
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next prev parent reply other threads:[~2010-01-12 16:18 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 2:48 [RFC PATCH 1/4] use nr_cpus= to set nr_cpu_ids early Yinghai Lu
2010-01-12 2:48 ` [RFC PATCH 3/4] x86: using logical flat for amd cpu too Yinghai Lu
2010-01-12 3:16 ` Linus Torvalds
2010-01-12 8:47 ` Yinghai Lu
2010-01-12 8:27 ` Ananth N Mavinakayanahalli
2010-01-12 22:50 ` H. Peter Anvin
2010-01-13 4:53 ` Ananth N Mavinakayanahalli
2010-01-12 2:48 ` [RFC PATCH 4/4] x86: according to nr_cpu_ids to decide if need to leave logical flat Yinghai Lu
2010-01-12 3:20 ` Linus Torvalds
2010-01-12 8:50 ` Yinghai Lu
2010-01-12 2:48 ` [RFC PATCH 2/4] x86: use dmi check to treat disabled cpus as hotplug cpus Yinghai Lu
2010-01-12 3:13 ` Linus Torvalds
2010-01-12 8:59 ` Yinghai Lu
2010-01-12 15:19 ` Linus Torvalds
2010-01-12 17:54 ` Suresh Siddha
2010-01-12 18:13 ` Yinghai Lu
2010-01-12 18:24 ` Suresh Siddha
2010-01-12 19:19 ` Yinghai Lu
2010-01-12 9:15 ` Yinghai Lu
2010-01-12 9:46 ` Ingo Molnar
2010-01-12 16:14 ` Valdis.Kletnieks [this message]
2010-01-12 16:26 ` Linus Torvalds
2010-01-12 17:17 ` Valdis.Kletnieks
2010-01-12 3:06 ` [RFC PATCH 1/4] use nr_cpus= to set nr_cpu_ids early Linus Torvalds
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