linux-kernel - Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical section?

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Message-ID: <0000014109cebf30-d652cc46-6cf8-4bf1-8ca3-8f9a12c1d7e9-000000@email.amazonses.com>
Date:	Tue, 10 Sep 2013 21:37:28 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, sbw@....edu
Subject: Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical
 section?

On Mon, 9 Sep 2013, Ingo Molnar wrote:

> I saw those, he posted 'needs testing' patches. He still behaved
> passive-aggressively, pretending that it was some difficult task to
> perform, as if we were pulling his teeth.

I need your review of those. I will rediff as soon as rc1 is out to
send something that can be put into -next. Please tell me until then if
the approach is ok. I dont think we can do anything in the merge window.

> The thing is, we should not be forced to shout at him at all: Christoph's
> should be _proactive_ in addressing the shortcomings that were readily
> pointed out literally years ago during review in a friendly fashion,
> instead of wasting a lot of people's time trying to argue around it...

I have fixed all the issues that Steven pointed out in the past about
suspicious __this_cpu operations a long time ago. He seemed to want to
implement the checks at that point. Not that difficult if one adds new
variants of this_cpu operations. Which was an issue initially. The
irqsafe_ this_cpu variants were nixed as the time because it was seen
to be too complicated.


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