linux-kernel - Re: kernel BUG at drivers/md/raid5.c:693!

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Message-ID: <20131125095323.GW10022@twins.programming.kicks-ass.net>
Date:	Mon, 25 Nov 2013 10:53:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <neilb@...e.de>
Cc:	fengguang.wu@...el.com, "Li, Shaohua" <shaohua.li@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: kernel BUG at drivers/md/raid5.c:693!

On Mon, Nov 25, 2013 at 10:35:22AM +1100, NeilBrown wrote:
> Ingo/Peter: is it considered OK to call wake_up while holding a spinlock?

Yes, very much so. Doing a wakeup isn't _that_ expensive.

> Could "sleeping spinlocks" affect this at all? (some sample stack traces are
> below).

Not entirely sure, are you referencing to -rt where me make spinlock_t
pi-mutexes?
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