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Re: r4k_dma_cache_inv_pc() does writeback

To: Jun Sun <jsun@mvista.com>
Subject: Re: r4k_dma_cache_inv_pc() does writeback
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Tue, 31 Oct 2000 03:43:34 +0100
Cc: linux-mips@oss.sgi.com
In-reply-to: <39FDC1B1.A4E33DDE@mvista.com>; from jsun@mvista.com on Mon, Oct 30, 2000 at 10:45:05AM -0800
References: <39FDC1B1.A4E33DDE@mvista.com>
Sender: owner-linux-mips@oss.sgi.com
On Mon, Oct 30, 2000 at 10:45:05AM -0800, Jun Sun wrote:

> It just occur to me that r4k_dma_cache_inv_pc() actually does a
> writeback before it invalidates the cache.  Is there story behind it? 
> Or just a plain bug?

No big story, I was simply to lazy to implement yet another function.
You could probably get some performance gains.

> If it is a bug, I don't find an easy way to invalidate the whole dcache
> other than writing a new function, perhaps in r4kcache.h.

  Ralf

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