linux-kernel - Re: [PATCH v13 7/7] x86/crash: add x86 crash hotplug support

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Message-ID: <Y2I3zQ9ZU+C9Kgf7@zn.tnic>
Date:   Wed, 2 Nov 2022 10:26:37 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Eric DeVolder <eric.devolder@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, bhe@...hat.com, vgoyal@...hat.com,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        hpa@...or.com, nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org, david@...hat.com,
        sourabhjain@...ux.ibm.com, konrad.wilk@...cle.com,
        boris.ostrovsky@...cle.com
Subject: Re: [PATCH v13 7/7] x86/crash: add x86 crash hotplug support

On Tue, Nov 01, 2022 at 10:45:00AM -0500, Eric DeVolder wrote:
> As I'm re-reading that message, I suspect now the preference is to just to
> strike this ifdiffery line in this file and have the code always present?
> 
> If the preference is actually for CRASH_HOTPLUG, then let me know.

Well, it is this part:

"But on a plain simple laptop or workstation which has CPU hotplug,
would it make sense for the crash ranges to get updated too when CPUs
are offlined?

If so, I think you want this code present there too, without a Kconfig
item."

IOW, if this thing doesn't make sense to have on the majority of
machines out there - and memory hotplug machines are not the majority -
then it should be behind a Kconfig item which is default off and gets
enabled only when the user selects crash and memory hotplug...

I'd say.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette