linux-kernel - Re: [PATCH 2/3] drivers/base/cpu: crash data showing should depends on KEXEC

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Message-ID: <ZV80X+lf2iOOTboW@MiWiFi-R3L-srv>
Date:   Thu, 23 Nov 2023 19:15:43 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Ignat Korchagin <ignat@...udflare.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        akpm@...ux-foundation.org, eric_devolder@...oo.com,
        kernel-team <kernel-team@...udflare.com>
Subject: Re: [PATCH 2/3] drivers/base/cpu: crash data showing should depends
 on KEXEC_CORE

On 11/23/23 at 08:34am, Ignat Korchagin wrote:
> On Thu, Nov 23, 2023 at 7:37 AM Baoquan He <bhe@...hat.com> wrote:
> >
> > When below kernel config items are set, compiling error are triggered.
> >
> > CONFIG_CRASH_CORE=y
> > CONFIG_KEXEC_CORE=y
> > CONFIG_CRASH_DUMP=y
> > CONFIG_CRASH_HOTPLUG=y
> >
> > ------------------------------------------------------
> > drivers/base/cpu.c: In function ‘crash_hotplug_show’:
> > drivers/base/cpu.c:309:40: error: implicit declaration of function ‘crash_hotplug_cpu_support’; did you mean ‘crash_hotplug_show’? [-Werror=implicit-function-declaration]
> >   309 |         return sysfs_emit(buf, "%d\n", crash_hotplug_cpu_support());
> >       |                                        ^~~~~~~~~~~~~~~~~~~~~~~~~
> >       |                                        crash_hotplug_show
> > cc1: some warnings being treated as errors
> > ------------------------------------------------------
> >
> > CONFIG_KEXEC is used to enable kexec_load interface, the
> > crash_notes/crash_notes_size/crash_hotplug showing depends on
> > CONFIG_KEXEC is incorrect. It should depend on KEXEC_CORE instead.
> >
> > Fix it now.
> 
> Can we add Fixes/CC stable, so it gets eventually backported into 6.6?

Makes sense. Will add it in v2 since I need respin to add the missing
stuff in patch 1. Thanks.

> 
> > Signed-off-by: Baoquan He <bhe@...hat.com>
> > ---
> >  drivers/base/cpu.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> > index 9ea22e165acd..548491de818e 100644
> > --- a/drivers/base/cpu.c
> > +++ b/drivers/base/cpu.c
> > @@ -144,7 +144,7 @@ static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
> >  #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
> >  #endif /* CONFIG_HOTPLUG_CPU */
> >
> > -#ifdef CONFIG_KEXEC
> > +#ifdef CONFIG_KEXEC_CORE
> >  #include <linux/kexec.h>
> >
> >  static ssize_t crash_notes_show(struct device *dev,
> > @@ -189,14 +189,14 @@ static const struct attribute_group crash_note_cpu_attr_group = {
> >  #endif
> >
> >  static const struct attribute_group *common_cpu_attr_groups[] = {
> > -#ifdef CONFIG_KEXEC
> > +#ifdef CONFIG_KEXEC_CORE
> >         &crash_note_cpu_attr_group,
> >  #endif
> >         NULL
> >  };
> >
> >  static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
> > -#ifdef CONFIG_KEXEC
> > +#ifdef CONFIG_KEXEC_CORE
> >         &crash_note_cpu_attr_group,
> >  #endif
> >         NULL
> > --
> > 2.41.0
> >
>