linux-kernel - Re: [PATCH 0/5] kexec: fix the incorrect ifdeffery and dependency of CONFIG

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Date:   Mon, 11 Dec 2023 17:10:29 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        loongarch@...ts.linux.dev, kexec@...ts.infradead.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-sh@...r.kernel.org, x86@...nel.org,
        akpm@...ux-foundation.org, eric_devolder@...oo.com,
        sfr@...b.auug.org.au, ignat@...udflare.com
Subject: Re: [PATCH 0/5] kexec: fix the incorrect ifdeffery and dependency of
 CONFIG_KEXEC

On 12/11/23 at 09:25am, Geert Uytterhoeven wrote:
> Hi Baoquan,
> 
> On Fri, Dec 8, 2023 at 8:43 AM Baoquan He <bhe@...hat.com> wrote:
> > Forgot adding kexec to CC, add it now.
> >
> > On 12/08/23 at 03:30pm, Baoquan He wrote:
> > > The select of KEXEC for CRASH_DUMP in kernel/Kconfig.kexec will be
> > > dropped, then compiling errors will be triggered if below config
> > > items are set:
> > >
> > > ===
> > > CONFIG_CRASH_CORE=y
> > > CONFIG_KEXEC_CORE=y
> > > CONFIG_CRASH_DUMP=y
> > > ===
> > >
> > > E.g on mips, below link error are seen:
> > > --------------------------------------------------------------------
> > > mipsel-linux-ld: kernel/kexec_core.o: in function `kimage_free':
> > > kernel/kexec_core.c:(.text+0x2200): undefined reference to `machine_kexec_cleanup'
> > > mipsel-linux-ld: kernel/kexec_core.o: in function `__crash_kexec':
> > > kernel/kexec_core.c:(.text+0x2480): undefined reference to `machine_crash_shutdown'
> > > mipsel-linux-ld: kernel/kexec_core.c:(.text+0x2488): undefined reference to `machine_kexec'
> > > mipsel-linux-ld: kernel/kexec_core.o: in function `kernel_kexec':
> > > kernel/kexec_core.c:(.text+0x29b8): undefined reference to `machine_shutdown'
> > > mipsel-linux-ld: kernel/kexec_core.c:(.text+0x29c0): undefined reference to `machine_kexec'
> > > --------------------------------------------------------------------
> > >
> > > Here, change the incorrect dependency of building kexec_core related object
> > > files, and the ifdeffery on architectures from CONFIG_KEXEC to
> > > CONFIG_KEXEC_CORE.
> > >
> > > Testing:
> > > ========
> > > Passed on mips and loognarch with the LKP reproducer.
> > >
> > > Baoquan He (5):
> > >   loongarch, kexec: change dependency of object files
> > >   m68k, kexec: fix the incorrect ifdeffery and build dependency of
> > >     CONFIG_KEXEC
> > >   mips, kexec: fix the incorrect ifdeffery and dependency of
> > >     CONFIG_KEXEC
> > >   sh, kexec: fix the incorrect ifdeffery and dependency of CONFIG_KEXEC
> > >   x86, kexec: fix the wrong ifdeffery CONFIG_KEXEC
> 
> I understand this series is v3 of "[PATCH v2] kexec_core: change
> dependency of object files"? As this series does not contain a
> changelog, can you please summarize what was changed?
> Thanks!

Oh, sorry for the confusion.

You are right, I should have taken this as v3 and posted to avoid
confusion.

I add below change log for this series, not sure if it's clearer than
before. E.g for m68k, the <asm/kexec.h> is included in <linux/kexec.h>.
The old ifdeffery CONFIG_KEXEC will cause those definitions in
asm/kexec.h unseen if CONFIG_KEXEC is unset. See
KEXEC_SOURCE_MEMORY_LIMIT, it's needed in kernel/kexec_core.c.

Changelog:
------------
v2->v3:
- Change the incorrect ifdeffery CONFIG_KEXEC in arch. Since select of
  KEXEC for CRASH_DUMP in kernel/Kconfig.kexec is dropped, people can
  set below config items dependently of CONFIG_KEXEC. Then those
  KEXEC_CORE or CRASH_CORE related codes compiling will report error.

  ===
  CONFIG_CRASH_CORE=y
  CONFIG_KEXEC_CORE=y
  CONFIG_CRASH_DUMP=y
  ===
- Change the incorrect ifdeffery CONFIG_KEXEC in get_cmdline_acpi_rsdp()
  of x86 because kexec_file_load needs that too.

v1->v2:
- V1 only includes fix on loongarch. Add m68k, mips, sh fix in v2 too.