linux-kernel - Re: [PATCH v9 7/9] liveupdate: kho: move to kernel/liveupdate

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Message-ID: <CA+CK2bAvh9Oa2SLfsbJ8zztpEjrgr_hr-uGgF1coy8yoibT39A@mail.gmail.com>
Date: Sat, 8 Nov 2025 13:01:30 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: brauner@...nel.org, corbet@....net, graf@...zon.com, jgg@...pe.ca, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org, masahiroy@...nel.org, ojeda@...nel.org, 
	pratyush@...nel.org, rdunlap@...radead.org, rppt@...nel.org, tj@...nel.org, 
	yanjun.zhu@...ux.dev
Subject: Re: [PATCH v9 7/9] liveupdate: kho: move to kernel/liveupdate

On Fri, Nov 7, 2025 at 5:23 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Sat,  1 Nov 2025 10:23:23 -0400 Pasha Tatashin <pasha.tatashin@...een.com> wrote:
>
> > Move KHO to kernel/liveupdate/ in preparation of placing all Live Update
> > core kernel related files to the same place.
>
> I notice that menuconfig is a bit weird after this.
>
> The "General setup" menu offers the "Live Update and Kexec HandOver"
> menu but there's nothing in there.  If one sets
> DEFERRED_STRUCT_PAGE_INIT then things look normal.
>
> Perhaps we shouldn't be offering "Live Update and Kexec HandOver" at
> all if !DEFERRED_STRUCT_PAGE_INIT.

Hi Andrew, thank you for noticing this, yes, indeed it looks strange
when empty. Let's disable the menu when DEFERRED_STRUCT_PAGE_INIT
until we relax this KHO/deferred init dependency.

diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig
index 054f6375a7af..d7344d347f69 100644
--- a/kernel/liveupdate/Kconfig
+++ b/kernel/liveupdate/Kconfig
@@ -7,6 +7,7 @@
 #

 menu "Live Update and Kexec HandOver"
+       depends on !DEFERRED_STRUCT_PAGE_INIT

 config LIVEUPDATE
        bool "Live Update Orchestrator"