From: Jinyang He <hejinyang@loongson.cn>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>,
Serge Semin <fancer.lancer@gmail.com>,
Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-mips@vger.kernel.org, Paul Burton <paulburton@kernel.org>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] MIPS: reserve the memblock right after the kernel
Date: Fri, 13 Nov 2020 11:28:36 +0800 [thread overview]
Message-ID: <4a73a75f-a3b2-7ba1-d8a1-a46f5c20e734@loongson.cn> (raw)
In-Reply-To: <4625868b-f845-2f03-c3f2-fc3ff1ccf63d@flygoat.com>
Hi, Jiaxun,
On 11/13/2020 10:30 AM, Jiaxun Yang wrote:
> Hi all,
>
> 在 2020/11/11 22:52, Serge Semin 写道:
>> Hello Alexander
>>
>> On Tue, Nov 10, 2020 at 11:29:50AM +0100, Alexander Sverdlin wrote:
>> 2) The check_kernel_sections_mem() method can be removed. But it
>> should be done carefully. We at least need to try to find all the
>> platforms, which rely on its functionality.
> It have been more than 10 years since introducing this this check, but
> I believe there must be a reason at the time.
>
> Also currently we have some unmaintained platform and it's impossible
> to test on them for us.
>
> For Cavium's issue, I believe removing the page rounding can help.
> I'd suggest keep this method but remove the rounding part, also
> leave a warning or kernel taint when out of boundary kernel image
> is detected.
>
> Thanks.
>
> - Jiaxun
>
I found the first submission.
Commit: d3ff93380232 (mips: Make sure kernel memory is in iomem)
As I thought, this check is related to kdump. More directly, it is
related to the "mem=" parameter. Kexec-tools provide a "mem=" parameter
to limit the kernel location in kdump. But sometimes the memory may be not
enough and this check gives a way to ensure the capture kernel can
start rightly. Although "mem=" is not in kexec-tools now, I thought
it is also useful if someone use "mem=" to do other things.
Thanks,
Jinyang
>>
>> -Sergey
>>
>>> --
>>> Best regards,
>>> Alexander Sverdlin.
next prev parent reply other threads:[~2020-11-13 3:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 14:10 [PATCH] MIPS: reserve the memblock right after the kernel Alexander A Sverdlin
2020-11-07 9:40 ` Thomas Bogendoerfer
2020-11-09 10:34 ` Alexander Sverdlin
2020-11-09 11:08 ` Alexander Sverdlin
2020-11-10 9:55 ` Thomas Bogendoerfer
2020-11-10 10:29 ` Alexander Sverdlin
2020-11-11 14:52 ` Serge Semin
2020-11-13 2:30 ` Jiaxun Yang
2020-11-13 3:28 ` Jinyang He [this message]
2020-11-13 3:49 ` Maciej W. Rozycki
2020-11-13 12:29 ` Alexander Sverdlin
2020-11-13 12:56 ` Alexander Sverdlin
2020-11-13 9:17 ` Alexander Sverdlin
2020-11-13 13:09 ` Alexander Sverdlin
2020-11-16 22:31 ` Serge Semin
2020-11-17 9:41 ` Alexander Sverdlin
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