Re: Potential data race in dput and __d_lookup

From: Al Viro
Date: Thu Nov 20 2014 - 13:12:04 EST

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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