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
Subject: Re: [PATCH 2/6] Blackfin Serial Driver: Add a debug function to serial driver.
Date: Wed, 15 Oct 2008 10:23:41 +0800 [thread overview]
Message-ID: <1224037421.6284.40.camel@dyang> (raw)
In-Reply-To: <20081014142701.72090868@lxorguk.ukuu.org.uk>
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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next prev parent reply other threads:[~2008-10-15 2:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-13 9:46 [PATCH 0/6] Blackfin Serial Driver updates for 2.6.28 Bryan Wu
2008-10-13 9:46 ` [PATCH 1/6] Blackfin Serial Driver: updates kgdb over Blackfin serial driver with kgdb framework Bryan Wu
2008-10-13 9:46 ` [PATCH 2/6] Blackfin Serial Driver: Add a debug function to serial driver Bryan Wu
2008-10-14 13:27 ` Alan Cox
2008-10-15 2:23 ` gyang [this message]
2008-10-15 8:38 ` Alan Cox
2008-10-16 13:58 ` Bryan Wu
2008-10-13 9:46 ` [PATCH 3/6] Blackfin Serial Driver: fix bug - SIR driver stop receiving randomly Bryan Wu
2008-10-13 9:46 ` [PATCH 4/6] Blackfin Serial Driver: Clean serial console and early prink code` Bryan Wu
2008-10-13 9:46 ` [PATCH 5/6] Blackfin Serial Driver: Fix bug - BF527-EZKIT unable to receive large files over UART in DMA mode Bryan Wu
2008-10-13 9:46 ` [PATCH 6/6] Blackfin Serial Driver: Remove BI status for known_good_char Bryan Wu
2008-10-13 10:16 ` [PATCH 0/6] Blackfin Serial Driver updates for 2.6.28 Alan Cox
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