linux-kernel - Re: [PATCH] kexec: allow KEXEC_HANDOVER to build with COMPILE

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Message-ID: <2vxz8qd7z94n.fsf@kernel.org>
Date: Thu, 05 Feb 2026 13:07:36 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Sasha Levin <sashal@...nel.org>,  pasha.tatashin@...een.com,
  pratyush@...nel.org,  linux-kernel@...r.kernel.org,  surenb@...gle.com
Subject: Re: [PATCH] kexec: allow KEXEC_HANDOVER to build with COMPILE_TEST

On Thu, Feb 05 2026, Mike Rapoport wrote:

> On Wed, Feb 04, 2026 at 01:28:16PM -0500, Sasha Levin wrote:
>> Currently allmodconfig sets CONFIG_DEFERRED_STRUCT_PAGE_INIT which prevents KHO
>> from building.
>> 
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  kernel/liveupdate/Kconfig | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>> 
>> diff --git a/kernel/liveupdate/Kconfig b/kernel/liveupdate/Kconfig
>> index d2aeaf13c3acb..355b43492b8a4 100644
>> --- a/kernel/liveupdate/Kconfig
>> +++ b/kernel/liveupdate/Kconfig
>> @@ -1,14 +1,14 @@
>>  # SPDX-License-Identifier: GPL-2.0-only
>>  
>>  menu "Live Update and Kexec HandOver"
>> -	depends on !DEFERRED_STRUCT_PAGE_INIT
>> +	depends on !DEFERRED_STRUCT_PAGE_INIT || COMPILE_TEST
>>  
>>  config KEXEC_HANDOVER
>>  	bool "kexec handover"
>> -	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
>> -	depends on !DEFERRED_STRUCT_PAGE_INIT
>> +	depends on (ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE) || COMPILE_TEST
>
> I don't think we want to build this for all architectures.
> Let's keep depends on ARCH_ as it was.

Yep. All these test robot warnings are because a bunch of KHO/LUO code
assumes 64-bit arch.

>
>> +	depends on !DEFERRED_STRUCT_PAGE_INIT || COMPILE_TEST
>>  	select MEMBLOCK_KHO_SCRATCH
>> -	select KEXEC_FILE
>> +	select KEXEC_FILE if ARCH_SUPPORTS_KEXEC_FILE

If arch does not support kexec_file we can't use KHO at all anyway. So I
am not sure if this makes sense.

>>  	select LIBFDT
>>  	select CMA
>>  	help
>> -- 
>> 2.51.0
>> 

-- 
Regards,
Pratyush Yadav