Re: [PATCH 0/3] kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP

Eric DeVolder
2023-11-26T00:07:34Z

On 11/23/23 01:36, Baoquan He wrote:
> Ignat reported a potential config regression was introduced by
> commit 89cde455915f ("kexec: consolidate kexec and crash options
> into kernel/Kconfig.kexec"). Please click below link for more details:
>
> https://lore.kernel.org/all/CALrw=nHpRQQaQTP_jZfREgrQEMpS8jBF8JQCv4ygqXycE-StaA@mail.gmail.com/T/#u
>
> The patch 1 fix the regression by removing incorrect CONFIG_KEXEC
> ifdeffery scope adding in arm's <asm/kexec.h>, then dropping the
> select of KEXEC for CRASH_DUMP. This is tested and passed a cross
> comiping of arm.
>
> Patch 2 is to fix a build failure when I tested patch 1 on x86_64, the
> wrong CONFIG_KEXEC iddeffery is replaced with CONFIG_KEXEC_CORE. Test
> passed on x86_64.
>
> Patch 3 is to fix an unnecessary 'select KEXEC' in s390 ARCH. Removing
> the select won't impact anything. Test passed on a ibm-z system.

I apologize for my delay in responding, I did not have a computer with
me during my holiday travel.

I was able to re-run my Kconfig test script with this patch series (now
that I'm running this on private resources, it takes half a day 8( ).
The script only performs comparisons of the .config before (LHSB) and
after (RHSB) the patch series; it does NOT do any building. At any rate,
what that revealed was only differences in s390. That means that all
other arches do not have any unintended side effects. The differences
with patch3 applied look like:

FAIL: allnoconfig arch/s390/configs/kasan.config
LHSB {'CONFIG_CRASH_CORE': 'y', 'CONFIG_KEXEC_CORE': 'y',
'CONFIG_KEXEC': 'y'}
RHSB {'CONFIG_KEXEC': 'n'}

The 'allnoconfig' and 'olddefconfig' targets failed for all s390
defconfigs. The LHSB is the pre-patch values, and the RHSB is the
post-patch values. So this states that CRASH_CORE and KEXEC_CORE were
set previously, but now they are not. KEXEC obviously is being turned
off intentionally.

Hope this helps some.

Regards,

eric

> Baoquan He (3):
> kernel/Kconfig.kexec: drop select of KEXEC for CRASH_DUMP
> drivers/base/cpu: crash data showing should depends on KEXEC_CORE
> s390/Kconfig: drop select of KEXEC
>
> arch/arm/include/asm/kexec.h | 4 ----
> arch/s390/Kconfig | 1 -
> drivers/base/cpu.c | 6 +++---
> kernel/Kconfig.kexec | 1 -
> 4 files changed, 3 insertions(+), 9 deletions(-)
>