linux-kernel - Re: [PATCH v8 04/13] arm64: introduce is_device_dma

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Date:	Tue, 11 Nov 2014 11:14:10 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	"david.vrabel@...rix.com" <david.vrabel@...rix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [PATCH v8 04/13] arm64: introduce is_device_dma_coherent

On Mon, 10 Nov 2014, Catalin Marinas wrote:
> On Mon, Nov 10, 2014 at 04:13:56PM +0000, Stefano Stabellini wrote:
> > Introduce a boolean flag and an accessor function to check whether a
> > device is dma_coherent. Set the flag from set_arch_dma_coherent_ops.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> 
> BTW, why do I sign off this patch? As long as it's you as author, I
> don't think you should add my sign-off.

IANAL but as you wrote most of the code in the patch, I think that your
Signed-off-by is required because the lines you wrote are under your
copyright, not mine. TBH for such a small patch, it probably doesn't
matter (there is a limit to what one can claim copyright on).
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