linux-kernel - Re: Potential data race in dput and __d

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Message-ID: <20141120181145.GO7996@ZenIV.linux.org.uk>
Date:	Thu, 20 Nov 2014 18:11:46 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Will Deacon <will.deacon@....com>
Cc:	Andrey Konovalov <andreyknvl@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Davidlohr Bueso <davidlohr@...com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	"ktsan@...glegroups.com" <ktsan@...glegroups.com>
Subject: Re: Potential data race in dput and __d_lookup

On Thu, Nov 20, 2014 at 05:41:01PM +0000, Will Deacon wrote:

> I think it should be fine. d_lock is #defined as d_lockref.lock, and the
> whole way the lockref works is that you can either cmpxchg the lock and the
> counter

... both by a single operation, that is.
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