linux-kernel - Re: [PATCH v14 3/7] crash: add generic infrastructure for crash hotplug support

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Date:   Wed, 7 Dec 2022 21:57:48 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Eric DeVolder <eric.devolder@...cle.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...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 v14 3/7] crash: add generic infrastructure for crash
 hotplug support

On 12/07/22 at 01:42pm, Borislav Petkov wrote:
> On Wed, Dec 07, 2022 at 08:36:13PM +0800, Baoquan He wrote:
> > Below is my last reply to Eric about my thinking on this.
> 
> Yes, I saw that.
> 
> So think about it: if a CONFIG_ item is not present, what does that mean
> for the code which is enclosed around it?

Ignored by compiler.

I thought we usually need to introduce the kernel config option, then
add code related to it, so that is a wrong idea. It would be helpful to
tell this somewhere in document.