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some question about wmb in mips

To: Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject: some question about wmb in mips
From: loody <miloody@gmail.com>
Date: Mon, 28 Jun 2010 00:16:06 +0800
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Dear all:
AFAIK, wmb in mips is implemented by calling sync,
wmb->fast_wmb->__sync, which makes sure Loads and stores executed
before the SYNC are completed before loads
and stores after the SYNC can start
But will this instruction write the cache back too?
take usb example, it will call this maco before it let host processing
the commands on dram, so I wondering whether sync will write the cache
back to memory.
appreciate your help,
miloody

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