Re: [RFC 0/4] Add SN2 Special Memory driver.

From: Christoph Hellwig <>
Date: 2004-09-10 18:32:06
On Fri, Sep 10, 2004 at 03:31:13AM -0500, Robin Holt wrote:
> On Fri, Sep 10, 2004 at 08:33:57AM +0100, Christoph Hellwig wrote:
> > On Thu, Sep 09, 2004 at 12:59:37PM -0500, Robin Holt wrote:
> > > I am not sure how to read this.  The fetchop function is a feature specifically
> > > in the SN2 memory controller.  Are you saying we should have a driver that
> > > provides fetchops for all ia64?  That seems wrong since it is a hardware feature.
> > > 
> > > If, on the other hand, you are saying that the uncached and cached drivers
> > > should be available for all ia64 and the fetchop only if you are on sn2, I
> > > can understand that.  That actually seems rather reasonable.
> > 
> > Yes, that's what I meant.  Even if it's mostly useful for SGI's userland
> > it's implementation shouldn't depend on a SN2 kernel if it doesn't use any
> > SN2-specific functionality.
> Do any other processors have the write combining features of the ia64?  Is this
> type of memory useable by any other processor?  If not, does this driver belong
> in the arch/ia64/kernel directory?

Umm, yes I guess it'll be ia64-specific at least as a start,  I just wanted to
avoid having it SN2-specific.

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Received on Fri Sep 10 04:32:32 2004

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