Hi,
here are the words of the wise concerning the DMA problems.
I'd suggest that we #define a macro for the time being.
Regards
Oliver
---------- Weitergeleitete Nachricht ----------
Subject: Re: PCI DMA to small buffers on cache-incoherent arch
Date: Mon, 10 Jun 2002 03:24:01 -0700 (PDT)
From: "David S. Miller" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
From: Oliver Neukum <[EMAIL PROTECTED]>
Date: Mon, 10 Jun 2002 12:00:14 +0200
> You flush either before/after depending upon whether the cpu caches
> are writeback in nature or not, and the cpu is not allowed to touch
> those addresses while the device is doing the DMA.
So we need some kind of cache_aligned macro in our USB data
structures if they contain a buffer. Which macro would we have to use ?
For now use SMP_CACHE_BYTES I guess.
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