linux-kernel - Re: [PATCH v2 14/16] x86, nvdimm, kexec: Use walk_iomem_res

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Message-ID: <20160104092937.GB7033@dhcp-128-65.nay.redhat.com>
Date:	Mon, 4 Jan 2016 17:29:37 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Minfei Huang <mhuang@...hat.com>, Toshi Kani <toshi.kani@....com>,
	linux-arch@...r.kernel.org, linux-nvdimm@...1.01.org,
	x86@...nel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH v2 14/16] x86, nvdimm, kexec: Use walk_iomem_res_desc()
 for iomem search

Hi, Boris

On 12/27/15 at 11:24am, Borislav Petkov wrote:
> On Sun, Dec 27, 2015 at 10:12:57AM +0800, Minfei Huang wrote:
> > You can refer the below link that you may get a clue about GART. This is
> > the fisrt time kexec-tools tried to support to ignore GART region in 2nd
> > kernel.
> > 
> > http://lists.infradead.org/pipermail/kexec/2008-December/003096.html
> 
> So theoretically we could export that IORES_DESC* enum in an uapi header and
> move kexec-tools to use that.
> 
> However, I'm fuzzy on how exactly the whole compatibility thing is done
> with kexec-tools and the kernel. We probably would have to support
> newer kexec-tools on an older kernel and vice versa so I'd guess we
> should mark walk_iomem_res() deprecated so that people are encouraged to
> upgrade to newer kexec-tools...

Replied to Toshi old kernel will export the "GART" region for amd cards.
So for old kernel and new kexec-tools we will have problem.

I think add the GART desc for compitibility purpose is doable, no?

Thanks
Dave
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