linux-kernel - Re: [PATCH tip/core/rcu 3/9] drivers/md: Use rcu

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Message-ID: <1416760785.17888.18.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 23 Nov 2014 08:39:45 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH tip/core/rcu 3/9] drivers/md: Use rcu_dereference() for
 accessing rcu pointer

On Sun, 2014-11-23 at 07:21 -0500, Pranith Kumar wrote:

> I am not sure we should be taking rcu_read_lock() there as I am not
> sure how long that critical section might last. Can someone who is
> more familiar with the code take a look?
> 
> I will try to look for a solution too in the mean time.

I am sending a fix.


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