linux-kernel - Re: BUG: using smp_processor_id() in preemptible [00000000] code: icedove-bin/5449

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Message-ID: <1276335744.2077.3093.camel@twins>
Date:	Sat, 12 Jun 2010 11:42:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Divyesh Shah <dpshah@...gle.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Ingo Molnar <mingo@...e.hu>,
	piotr@...owicz.com, linux-kernel@...r.kernel.org
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code: 
 icedove-bin/5449

On Fri, 2010-06-11 at 18:54 -0700, Divyesh Shah wrote:
> I was able to repro the issue and and have a patch that
> replaces use of sched_clock() in block layer w/
> ktime_to_ns(ktime_get()). 

You know ktime_get() is terrifyingly expensive, right?
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