linux-kernel - Re: [PATCH linux-next 1/3] x86, crash: don't nest CONFIG_CRASH_DUMP ifdef inside CONFIG_KEXEC

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Message-ID: <ZbhH+sg1BPi+R0j4@MiWiFi-R3L-srv>
Date: Tue, 30 Jan 2024 08:51:06 +0800
From: Baoquan He <bhe@...hat.com>
To: Michael Kelley <mhklinux@...look.com>
Cc: "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"nathan@...nel.org" <nathan@...nel.org>
Subject: Re: [PATCH linux-next 1/3] x86, crash: don't nest CONFIG_CRASH_DUMP
 ifdef inside CONFIG_KEXEC_CODE ifdef scope

On 01/29/24 at 06:27pm, Michael Kelley wrote:
> From: Baoquan He <bhe@...hat.com> Sent: Monday, January 29, 2024 5:51 AM
> > 
> > Michael pointed out that the #ifdef CONFIG_CRASH_DUMP is nested inside
> > arch/x86/xen/enlighten_hvm.c.
> 
> Did some words get left out in the above sentence?  It mentions the Xen
> case, but not the Hyper-V case.  I'm not sure what you intended.

Thanks a lot for your careful reviewing.

Yeah, I tried to list all affected file names, seems my vim editor threw
away some words. And I forgot mentioning the change in reboot.c.

I adjusted log as below according to your comments, do you think it's OK
now?

===
Michael pointed out that the #ifdef CONFIG_CRASH_DUMP is nested inside
CONFIG_KEXEC_CODE ifdef scope in some XEN, HyperV codes. 

Although the nesting works well too since CONFIG_CRASH_DUMP has
dependency on CONFIG_KEXEC_CORE, it may cause confusion because there
are places where it's not nested, and people may think it needs be nested
even though it doesn't have to.

Fix that by moving  CONFIG_CRASH_DUMP ifdeffery of codes out of
CONFIG_KEXEC_CODE ifdeffery scope.

And also put function machine_crash_shutdown() definition inside
CONFIG_CRASH_DUMP ifdef scope instead of CONFIG_KEXEC_CORE ifdef.

And also fix a building error Nathan reported as below by replacing
CONFIG_KEXEC_CORE ifdef with CONFIG_VMCORE_INFO ifdef.
.....
===

Thanks
Baoquan