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From: David Miller <davem@davemloft.net>
Subject: Re: Socket buffer sizes with autotuning
Date: Mon, 12 May 2008 20:58:37 -0700 (PDT)
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From: "Jerry Chu" <hkchu@google.com>
Date: Mon, 12 May 2008 20:56:16 -0700

> If true, can we use some atomic operation to zap in_flight, but also
> return to the caller if in_flight has been nullified already so that
> the accounting can be handled correctly?

xchg() should work for that purpose.