From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Zhao Chenhui <chenhui.zhao@freescale.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/sysfs: disable hotplug for the boot cpu
Date: Sat, 15 Jun 2013 08:53:37 +1000 [thread overview]
Message-ID: <1371250417.21896.17.camel@pasglop> (raw)
In-Reply-To: <20130613112552.GC7536@localhost.localdomain>
On Thu, 2013-06-13 at 19:25 +0800, Zhao Chenhui wrote:
> Some multicore SoCs firstly boot up the cpu0 after warm reset.
> In some suspend/resume cases, SoC will do a warm reset when resuming.
> In order to ensure that the suspending and resuming is running
> on a same cpu, cpu0 should be the last cpu to suspend. Here, cpu0 is
> the boot_cpuid.
Well, so:
- In any case, your patch will break pseries, so it's not acceptable.
- Why does it have to absolutely resume from the same CPU it suspended
from ? Can't you have a little bit of code on the resuming CPU that
checks if it's not online, poke an online one and goes back to sleep ?
Cheers,
Ben.
prev parent reply other threads:[~2013-06-14 22:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-28 7:59 [PATCH] powerpc/mpic: fix irq distribution problem when MPIC_SINGLE_DEST_CPU Zhao Chenhui
2013-05-28 7:59 ` [PATCH] powerpc/sysfs: disable hotplug for the boot cpu Zhao Chenhui
2013-05-31 21:49 ` Benjamin Herrenschmidt
2013-06-03 10:43 ` Zhao Chenhui
2013-06-12 3:25 ` Benjamin Herrenschmidt
2013-06-13 11:25 ` Zhao Chenhui
2013-06-14 22:53 ` Benjamin Herrenschmidt [this message]
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