linux-kernel - Re: [PATCH 2/6] Blackfin Serial Driver: Add a debug function to serial driver.

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Message-Id: <1224037421.6284.40.camel@dyang>
Date:	Wed, 15 Oct 2008 10:23:41 +0800
From:	gyang <graf.yang@...log.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Bryan Wu <cooloney@...nel.org>, alan@...hat.com,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/6] Blackfin Serial Driver: Add a debug function to
	serial driver.

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

在 2008-10-14二的 14:27 +0100，Alan Cox写道：
> > -		cpu_relax();
> > +		barrier();
> > +
> 
> Seems to be an odd unrelated change ?
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