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

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Message-ID: <c8c09929-165a-b710-6993-0b149a0c3b99@arm.com>
Date:   Wed, 18 Jul 2018 17:52:03 +0100
From:   James Morse <james.morse@....com>
To:     Dave Young <dyoung@...hat.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:     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 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.


Thanks,

James