linux-kernel - Re: 3.14.23-rt20 - aio: fix rcu garbage collection might

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Message-ID: <1424181697.2955.6.camel@gmail.com>
Date:	Tue, 17 Feb 2015 15:01:37 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	John Kacur <jkacur@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: 3.14.23-rt20 - aio: fix rcu garbage collection might_sleep()
 splat

On Tue, 2015-02-17 at 13:53 +0100, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2014-11-02 08:31:28 [+0100]:
> 
> >(not pretty)
> 
> You do the RCU thingy and replace locking. Is this required after the
> patch I've sent in "Re: [RFC PATCH V2] rt/aio: fix rcu garbage
> collection might_sleep() splat"? From a quick browse I've seen that
> ffs_epfile_aio_write() invokes kiocb_set_cancel_fn(, ffs_aio_cancel) and
> the function does hold a sleeping lock.

Yeah, I don't think that's changed, it should still gripe.

	-Mike

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