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Subject: Re: [PATCH v7 0/4] support reserving crashkernel above 4G on arm64
 kdump
To:     Arnd Bergmann <arnd@arndb.de>
References: <20191223152349.180172-1-chenzhou10@huawei.com>
 <a57d46bc-881e-3526-91ca-558bf64e2aa8@huawei.com>
 <CAK8P3a2VrAqefPYF2JqRjwdhgTDtORUgWgVuYxRYWqKxE3+5pA@mail.gmail.com>
CC:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        James Morse <james.morse@arm.com>,
        Dave Young <dyoung@redhat.com>,
        "Bhupesh Sharma" <bhsharma@redhat.com>,
        <john.p.donnelly@oracle.com>, <pkushwaha@marvell.com>,
        Simon Horman <horms@verge.net.au>, <kexec@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>
From:   chenzhou <chenzhou10@huawei.com>
Message-ID: <e35e37f2-bcb3-cc19-d506-18f576dcbfb9@huawei.com>
Date:   Wed, 20 May 2020 11:30:43 +0800
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Hi Arnd,

On 2020/5/19 18:21, Arnd Bergmann wrote:
> On Thu, Mar 26, 2020 at 4:10 AM Chen Zhou <chenzhou10@huawei.com> wrote:
>> Hi all,
>>
>> Friendly ping...
> I was asked about this patch series, and see that you last posted it in
> December. I think you should rebase it to linux-5.7-rc6 and post the
> entire series again to make progress, as it's unlikely that any maintainer
> would pick up the patches from last year.
>
> For the contents, everything seems reasonable to me, but I noticed that
> you are adding a property to the /chosen node without adding the
> corresponding documentation to
> Documentation/devicetree/bindings/chosen.txt
>
> Please add that, and Cc the devicetree maintainers on the updated
> patch.
>
>          Arnd

Thanks for your review and comments, i will rebase it to linux-5.7-rc6 and add the
corresponding documentation.

Thanks,
Chen Zhou

>> On 2019/12/23 23:23, Chen Zhou wrote:
>>> This patch series enable reserving crashkernel above 4G in arm64.
>>>
>>> There are following issues in arm64 kdump:
>>> 1. We use crashkernel=X to reserve crashkernel below 4G, which will fail
>>> when there is no enough low memory.
>>> 2. Currently, crashkernel=Y@X can be used to reserve crashkernel above 4G,
>>> in this case, if swiotlb or DMA buffers are required, crash dump kernel
>>> will boot failure because there is no low memory available for allocation.
>>>
>>> The previous changes and discussions can be retrieved from:
>>>
>>> Changes since [v6]
>>> - Fix build errors reported by kbuild test robot.
> ...
>
> .
>