Subject: Re: [PATCH 2/6] Blackfin Serial Driver: Add a debug function to
	serial driver.
From: gyang <graf.yang@analog.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Bryan Wu <cooloney@kernel.org>, alan@redhat.com,
       linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
In-Reply-To: <20081014142701.72090868@lxorguk.ukuu.org.uk>
References: <1223891185-13924-1-git-send-email-cooloney@kernel.org>
	 <1223891185-13924-3-git-send-email-cooloney@kernel.org>
	 <20081014142701.72090868@lxorguk.ukuu.org.uk>
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Date: Wed, 15 Oct 2008 10:23:41 +0800
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Hi, Alan,

We are making a SMP like patch to blackfin, cpu_relax() is replaced by a
data cache flush function which will count it to a per-cpu counter.
If this serial function is called too early, the per-cpu data area have
not been initialized, this call will cause crash.
So we'd like to use barrier() instead of cpu_relax().

BRs,
Graf

?? 2008-10-14???? 14:27 +0100??Alan Coxд????
> > -		cpu_relax();
> > +		barrier();
> > +
> 
> Seems to be an odd unrelated change ?
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