linux-kernel - Re: [PATCH v2 8/8] habanalabs: enable 64-bit DMA mask in POWER9

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Message-ID: <20190611151753.GA11404@infradead.org>
Date:   Tue, 11 Jun 2019 08:17:53 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Oded Gabbay <oded.gabbay@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/8] habanalabs: enable 64-bit DMA mask in POWER9

On Tue, Jun 11, 2019 at 11:58:57AM +0200, Greg KH wrote:
> That feels like a big hack.  ppc doesn't have any "what arch am I
> running on?" runtime call?  Did you ask on the ppc64 mailing list?  I'm
> ok to take this for now, but odds are you need a better fix for this
> sometime...

That isn't the worst part of it.  The whole idea of checking what I'm
running to set a dma mask just doesn't make any sense at all.