linux-kernel - Re: [PATCH 0/3] ARM: Use generic interface to simplify crashkernel reservation

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Message-ID: <3157befe-431f-69ac-b9d3-7a8685ba3a4d@huawei.com>
Date: Tue, 9 Jul 2024 17:50:20 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Baoquan He <bhe@...hat.com>
CC: <linux@...linux.org.uk>, <vgoyal@...hat.com>, <dyoung@...hat.com>,
	<paul.walmsley@...ive.com>, <palmer@...belt.com>, <aou@...s.berkeley.edu>,
	<arnd@...db.de>, <afd@...com>, <akpm@...ux-foundation.org>,
	<rmk+kernel@...linux.org.uk>, <linus.walleij@...aro.org>,
	<eric.devolder@...cle.com>, <gregkh@...uxfoundation.org>, <deller@....de>,
	<javierm@...hat.com>, <robh@...nel.org>, <thunder.leizhen@...wei.com>,
	<austindh.kim@...il.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <kexec@...ts.infradead.org>
Subject: Re: [PATCH 0/3] ARM: Use generic interface to simplify crashkernel
 reservation



On 2024/7/9 17:29, Baoquan He wrote:
> On 07/08/24 at 09:33pm, Jinjie Ruan wrote:
>> Currently, x86, arm64, riscv and loongarch has been switched to generic
>> crashkernel reservation. Also use generic interface to simplify crashkernel
>> reservation for arm32, and fix two bugs by the way.
> 
> I am not sure if this is a good idea. I added the generic reservation
> itnerfaces for ARCH which support crashkernel=,high|low and normal
> crashkernel reservation, with this, the code can be simplified a lot.
> However, arm32 doesn't support crashkernel=,high, I am not sure if it's
> worth taking the change, most importantly, if it will cause
> misunderstanding or misoperation.

Yes, arm32 doesn't support crashkernel=,high.

However, a little enhancement to the generic code (please see the first
patch), the generic reservation interfaces can also be applicable to
architectures that do not support "high" such as arm32, and it can also
simplify the code (please see the third patch).

> 
> Thanks
> Baoquan
> 
>