From: Andrew Morton <akpm@osdl.org>
To: Shaohua Li <shaohua.li@intel.com>
Cc: pavel@ucw.cz, linux-kernel@vger.kernel.org, davidm@napali.hpl.hp.com
Subject: Re: Hotplug CPU printk issue
Date: Wed, 25 May 2005 22:52:04 -0700 [thread overview]
Message-ID: <20050525225204.68bf0684.akpm@osdl.org> (raw)
In-Reply-To: <1117086211.7657.10.camel@linux-hp.sh.intel.com>
Shaohua Li <shaohua.li@intel.com> wrote:
>
> > Please confirm that we in fact do not want to allow downed CPUs to
> > print things, then send a patch.
> Yep. In the cpu hotplug case, per-cpu data possibly isn't initialized
> even the system state is 'running'. As the comments say in the original
> code, some console drivers assume per-cpu resources have been allocated.
> radeon fb is one such driver, which uses kmalloc. After a CPU is down,
> the per-cpu data of slab is freed, so the system crashed when printing
> some info.
hm, that certainly sounds sane, but I do recall there were
reasonable-sounding reasons why the ia64 guys wanted printk-on-a-down-CPU
to work. Hopefully David can remember what the problem was so we can find
a more thorough fix.
next prev parent reply other threads:[~2005-05-26 5:56 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-12 5:31 [PATCH 6/6]suspend/resume SMP support Li Shaohua
2005-04-12 9:43 ` Pavel Machek
2005-04-12 10:51 ` Pavel Machek
2005-04-12 12:40 ` Li Shaohua
2005-04-13 8:32 ` Pavel Machek
2005-04-14 8:27 ` Li Shaohua
2005-04-14 8:40 ` Li Shaohua
2005-04-23 22:35 ` Andrew Morton
2005-04-23 22:41 ` Pavel Machek
2005-04-25 0:49 ` Li Shaohua
2005-05-26 2:58 ` Hotplug CPU printk issue Shaohua Li
2005-05-26 3:48 ` Andrew Morton
2005-05-26 5:43 ` Shaohua Li
2005-05-26 5:52 ` Andrew Morton [this message]
2005-05-26 19:32 ` David Mosberger
2005-05-27 2:08 ` Rusty Russell
2005-04-28 7:22 ` [PATCH 6/6]suspend/resume SMP support Andrew Morton
2005-04-28 7:28 ` Li Shaohua
2005-04-28 7:41 ` Andrew Morton
2005-04-28 8:29 ` Li Shaohua
2005-04-28 8:35 ` Pavel Machek
2005-04-28 9:04 ` [ACPI] " Rafael J. Wysocki
2005-04-28 7:35 ` Li Shaohua
2005-04-28 7:42 ` Pavel Machek
2005-04-28 8:11 ` [ACPI] " Yu, Luming
2005-04-28 8:20 ` Pavel Machek
2005-04-28 8:34 ` Yu, Luming
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