From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org, x86@kernel.org,
oleg@redhat.com, rusty@rustcorp.com.au, sivanich@sgi.com,
heiko.carstens@de.ibm.com, dipankar@in.ibm.com,
josh@freedesktop.org, paulmck@linux.vnet.ibm.com,
akpm@linux-foundation.org, arjan@linux.intel.com,
torvalds@linux-foundation.org
Subject: Re: [PATCH 1/4] cpu_stop: implement stop_cpu[s]()
Date: Tue, 04 May 2010 08:55:21 +0200 [thread overview]
Message-ID: <4BDFC4D9.4030408@kernel.org> (raw)
In-Reply-To: <4BDFC16A.8070500@kernel.org>
Hello, again.
On 05/04/2010 08:40 AM, Tejun Heo wrote:
> Oh, I had code piece which wanted to discern between -ENOENT from
> non-excution and -ENOENT return from the work function which seems
> gone now. I'll check things again and drop ->executed if everything
> looks okay.
Eh... now I remember. If we start with ->ret = 0, stop_cpus() can't
return -ENOENT when none of the specified cpus executed without
tracking execution status (so the current code). If we start with
->ret = -ENOENT, we can't tell whether all cpus executed successfully
or none has executed unless we BUG_ON() -ENOENT return from work
functions and let 0 return override -ENOENT.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-05-04 6:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 16:09 [PATCHSET sched/core] cpu_stop: implement and use cpu_stop Tejun Heo
2010-04-22 16:09 ` [PATCH 1/4] cpu_stop: implement stop_cpu[s]() Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:36 ` Tejun Heo
2010-05-04 7:03 ` Tejun Heo
2010-05-04 8:43 ` Peter Zijlstra
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:36 ` Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 6:40 ` Tejun Heo
2010-05-04 6:55 ` Tejun Heo [this message]
2010-04-22 16:09 ` [PATCH 2/4] stop_machine: reimplement using cpu_stop Tejun Heo
2010-04-22 16:09 ` [PATCH 3/4] scheduler: replace migration_thread with cpu_stop Tejun Heo
2010-05-03 13:26 ` Peter Zijlstra
2010-05-04 7:17 ` Tejun Heo
2010-05-04 12:45 ` Peter Zijlstra
2010-05-04 12:49 ` Tejun Heo
2010-04-22 16:09 ` [PATCH 4/4] scheduler: kill paranoia check in synchronize_sched_expedited() Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2010-05-04 13:47 [PATCHSET sched/core] cpu_stop: implement and use cpu_stop, take#2 Tejun Heo
2010-05-04 13:47 ` [PATCH 1/4] cpu_stop: implement stop_cpu[s]() Tejun Heo
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