linux-kernel - Re: [PATCH] powerpc/npu-dma: Remove NPU DMA ops

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Date:   Tue, 30 Oct 2018 14:24:02 +0100
From:   Christoph Hellwig <hch@....de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Christoph Hellwig <hch@....de>,
        Alistair Popple <alistair@...ple.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        mpe@...erman.id.au
Subject: Re: [PATCH] powerpc/npu-dma: Remove NPU DMA ops

On Wed, Oct 31, 2018 at 12:09:29AM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2018-10-30 at 13:58 +0100, Christoph Hellwig wrote:
> > Please take my patch instead.  We have a kernel polcity to not keep
> > dead code around, and everyone including Linus and the attending IBMers
> > confirmed this.
> 
> Let's call a cat a cat ... ;-)
> 
> It's not *dead* code. It's code that is used by an out of tree driver
> (which also happen not to be open source).

Which clearly makes it a derived work of the kernel if it uses an
interface just create for it, and thus even more important to remove
it to not get anyone into legal trouble.