From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
rt@linutronix.de, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH 10/16] cpuidle: pseries: Convert to hotplug state machine
Date: Tue, 23 Aug 2016 18:32:06 +0200 [thread overview]
Message-ID: <20160823163206.xe7dg7ulzj4pzzrs@linutronix.de> (raw)
In-Reply-To: <57BC5AAC.7070707@linaro.org>
On 2016-08-23 16:16:12 [+0200], Daniel Lezcano wrote:
> Yes. If we can limit the number of duplicating enum for the same purpose
> right now, it would be nice.
Okay.
> > We could do that but you would have to ensure that only one CPUIDLE
> > driver registers itself at a time and for those powerpc drivers it looks
> > like you could have two registered (not sure about ARM's little/big (if
> > you could have two of those later at run-time)).
>
> At the first glance, I don't think it is possible to register the cpu
> hotplug callback twice because the cpuidle drivers are doing:
…
> So if a previous driver was already registered, cpuidle_register will
> fail and register_cpu_notifier won't be hit.
>
> There is the same scenario for intel_idle and processor_idle (acpi).
I tried to preserve everything as-is during the conversation. However if
you are explicitly asking for this and you are sure that it will work
then you can get it. No problem :)
Sebastian
next prev parent reply other threads:[~2016-08-23 16:32 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-18 12:57 cpu hotplug: convert more drivers Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 01/16] cpuhotplug: Remove CPU_STARTING and CPU_DYING notifier Sebastian Andrzej Siewior
2016-09-06 15:19 ` [tip:smp/hotplug] cpu/hotplug: " tip-bot for Thomas Gleixner
2016-09-06 16:37 ` tip-bot for Thomas Gleixner
2016-08-18 12:57 ` [PATCH 02/16] relayfs: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-09-06 15:20 ` [tip:smp/hotplug] " tip-bot for Richard Weinberger
2016-09-06 16:38 ` tip-bot for Richard Weinberger
2016-08-18 12:57 ` [PATCH 03/16] slab: " Sebastian Andrzej Siewior
2016-08-18 17:08 ` Sebastian Andrzej Siewior
2016-08-23 12:53 ` [PATCH 03/16 v2] " Sebastian Andrzej Siewior
2016-09-06 15:21 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:38 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 04/16] slub: " Sebastian Andrzej Siewior
2016-09-06 15:21 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:38 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 05/16] mm: writeback: " Sebastian Andrzej Siewior
2016-09-06 15:22 ` [tip:smp/hotplug] mm/writeback: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:39 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 06/16] kernel: softirq: " Sebastian Andrzej Siewior
2016-09-06 15:22 ` [tip:smp/hotplug] kernel/softirq: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:39 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 07/16] rcu: rcutorture: " Sebastian Andrzej Siewior
2016-08-18 16:20 ` Paul E. McKenney
2016-08-18 12:57 ` [PATCH 08/16] net: mvneta: " Sebastian Andrzej Siewior
2016-09-06 15:23 ` [tip:smp/hotplug] net/mvneta: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:40 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 09/16] md: raid5: " Sebastian Andrzej Siewior
2016-09-06 15:23 ` [tip:smp/hotplug] md/raid5: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:40 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 10/16] cpuidle: pseries: " Sebastian Andrzej Siewior
2016-08-22 16:09 ` Daniel Lezcano
2016-08-22 19:04 ` Sebastian Andrzej Siewior
2016-08-23 14:16 ` Daniel Lezcano
2016-08-23 16:32 ` Sebastian Andrzej Siewior [this message]
2016-08-24 9:09 ` [PATCH 10/16 v2] " Sebastian Andrzej Siewior
2016-09-06 15:24 ` [tip:smp/hotplug] cpuidle/pseries: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:41 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 11/16] cpuidle: powernv: " Sebastian Andrzej Siewior
2016-08-24 9:12 ` Sebastian Andrzej Siewior
2016-09-06 15:24 ` [tip:smp/hotplug] cpuidle/powernv: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:41 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 12/16] cpuidle: coupled: " Sebastian Andrzej Siewior
2016-08-23 14:24 ` Daniel Lezcano
2016-08-24 9:14 ` [PATCH 12/16 v2] " Sebastian Andrzej Siewior
2016-09-06 15:25 ` [tip:smp/hotplug] cpuidle/coupled: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:42 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 13/16] MIPS: BUS: CDMM: " Sebastian Andrzej Siewior
2016-09-06 15:25 ` [tip:smp/hotplug] MIPS/BUS/CDMM: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:42 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 14/16] x86: kvm: " Sebastian Andrzej Siewior
2016-08-18 17:06 ` Paolo Bonzini
2016-09-06 15:25 ` [tip:smp/hotplug] x86/kvm: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:43 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 15/16] powerpc: powermac: " Sebastian Andrzej Siewior
2016-09-06 15:26 ` [tip:smp/hotplug] powerpc/powermac: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:43 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 12:57 ` [PATCH 16/16] powerpc: mmu nohash: " Sebastian Andrzej Siewior
2016-09-06 15:26 ` [tip:smp/hotplug] powerpc/mmu " tip-bot for Sebastian Andrzej Siewior
2016-09-06 16:44 ` tip-bot for Sebastian Andrzej Siewior
2016-08-18 13:40 ` cpu hotplug: convert more drivers Ingo Molnar
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