linux-kernel - Re: [PATCH] arm64: kexec: Add support for crashkernel CMA reservation

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Message-ID: <CAMj1kXHQKDMvrj-NUWVTN=AP0W5rUMdxXFzzp=OphxM7bE2PNQ@mail.gmail.com>
Date: Fri, 23 Jan 2026 12:24:50 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Jinjie Ruan <ruanjinjie@...wei.com>, corbet@....net, catalin.marinas@....com, 
	will@...nel.org, akpm@...ux-foundation.org, bp@...en8.de, 
	pawan.kumar.gupta@...ux.intel.com, mingo@...nel.org, 
	feng.tang@...ux.alibaba.com, kees@...nel.org, elver@...gle.com, arnd@...db.de, 
	lirongqing@...du.com, fvdl@...gle.com, bhelgaas@...gle.com, bhe@...hat.com, 
	dave.hansen@...ux.intel.com, rppt@...nel.org, ryan.roberts@....com, 
	osandov@...com, jbohac@...e.cz, sourabhjain@...ux.ibm.com, cfsworks@...il.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: kexec: Add support for crashkernel CMA reservation

On Fri, 23 Jan 2026 at 10:30, Breno Leitao <leitao@...ian.org> wrote:
>
> Hello Jinjie,
>
> On Fri, Jan 23, 2026 at 03:48:20PM +0800, Jinjie Ruan wrote:
> > Extend crashkernel CMA reservation support to arm64.
>
> This is awesome. I was waiting for this patch! Thanks for working on it.
>

That is great!

But the commit log contains no motivation whatsoever why this is such
a good thing, so perhaps one of you can enlighten us? This endless
fiddling with boot-time memory reservations doesn't make the system
more robust, so having a good reason in the commit log why this change
is needed is really needed.