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Date:   Fri, 22 Jan 2021 11:12:44 +0800
From:   Dave Young <dyoung@redhat.com>
To:     john.p.donnelly@oracle.com
Cc:     Guilherme Piccoli <gpiccoli@canonical.com>,
        Kairui Song <kasong@redhat.com>,
        Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        linux-doc@vger.kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Will Deacon <will@kernel.org>,
        Anson Huang <Anson.Huang@nxp.com>,
        Jonathan Corbet <corbet@lwn.net>,
        the arch/x86 maintainers <x86@kernel.org>,
        Michael Walle <michael@walle.cc>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Vivek Goyal <vgoyal@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
        Borislav Petkov <bp@alien8.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-arm-kernel@lists.infradead.org, Baoquan He <bhe@redhat.com>,
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        Shawn Guo <shawnguo@kernel.org>
Subject: Re: [PATCH 1/1] kernel/crash_core.c - Add crashkernel=auto for x86
 and ARM
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On 01/22/21 at 09:22am, Dave Young wrote:
> Hi John,
> 
> On 01/21/21 at 09:32am, john.p.donnelly@oracle.com wrote:
> > On 11/22/20 9:47 PM, Dave Young wrote:
> > > Hi Guilherme,
> > > On 11/22/20 at 12:32pm, Guilherme Piccoli wrote:
> > > > Hi Dave and Kairui, thanks for your responses! OK, if that makes sense
> > > > to you I'm fine with it. I'd just recommend to test recent kernels in
> > > > multiple distros with the minimum "range" to see if 64M is enough for
> > > > crashkernel, maybe we'd need to bump that.
> > > 
> > > Giving the different kernel configs and the different userspace
> > > initramfs setup it is hard to get an uniform value for all distributions,
> > > but we can have an interface/kconfig-option for them to provide a value like this patch
> > > is doing. And it could be improved like Kairui said about some known
> > > kernel added extra values later, probably some more improvements if
> > > doable.
> > > 
> > > Thanks
> > > Dave
> > > 
> > 
> > Hi.
> > 
> > Are we going to move forward with implementing this for X86 and Arm ?
> > 
> > If other platform maintainers want to include this CONFIG option in their
> > configuration settings they have a starting point.
> 
> I would expect this become arch independent.

Clarify a bit, it can be a general config option under arch/Kconfig and
just put the code in general arch independent part.

> 
> Saeed, Kairui, would any of you like to update the patch?
> 
> > 
> > Thank you,
> > 
> > John.
> > 
> > ( I am not currently on many of the included dist lists  in this email, so
> > hopefully key contributors are included in this exchange )
> > 
> 
> Thanks
> Dave