linux-kernel - Re: [PATCH v11 03/15] powerpc, kexec_file: factor out memblock-based arch_kexec_walk

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Date:   Thu, 19 Jul 2018 10:23:25 +0800
From:   Dave Young <dyoung@...hat.com>
To:     James Morse <james.morse@....com>
Cc:     AKASHI Takahiro <takahiro.akashi@...aro.org>,
        catalin.marinas@....com, will.deacon@....com, dhowells@...hat.com,
        vgoyal@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, bhe@...hat.com, arnd@...db.de,
        ard.biesheuvel@...aro.org, bhsharma@...hat.com,
        kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v11 03/15] powerpc, kexec_file: factor out memblock-based
 arch_kexec_walk_mem()

Hi James,
On 07/18/18 at 05:52pm, James Morse wrote:
> Hi Dave, Akashi,
> 
> On 16/07/18 13:26, Dave Young wrote:
> > On 07/11/18 at 04:41pm, AKASHI Takahiro wrote:
> >> Memblock list is another source for usable system memory layout.
> >> So powerpc's arch_kexec_walk_mem() is moved to kexec_file.c so that
> >> other memblock-based architectures, particularly arm64, can also utilise
> >> it. A moved function is now renamed to kexec_walk_memblock() and merged
> >> into the existing arch_kexec_walk_mem() for general use, either resource
> >> list or memblock list.
> >>
> >> A consequent function will not work for kdump with memblock list, but
> >> this will be fixed in the next patch.
> > 
> > If this breaks something, then it would be good to fold the following
> > patch in this patch so that bisect can still work?
> 
> This patch is just moving code from arch/powerpc that is generic.
> powerpc doesn't support kdump via kexec_file, so nothing is damaged by adding
> this new code in the next patch.
> 
> arm64 would need this kdump support, but it doesn't use it until patch 11.

Ok, then I'm fine with it, thanks for the explanation.

> 
> 
> Thanks,
> 
> James

Thanks
Dave