linux-kernel - Re: [PATCH 2/3] [PATCH 2/3] kexec: split kexec

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Date:	Tue, 14 Jul 2015 16:46:51 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>, ptesarik@...e.cz,
	"Theodore Ts'o" <tytso@....edu>,
	Josh Boyer <jwboyer@...oraproject.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 2/3] [PATCH 2/3] kexec: split kexec_load syscall from
 kexec core code

Hi, Geert

Sorry for reply late, I'm occupied by other things.

On 07/13/15 at 10:55am, Geert Uytterhoeven wrote:
> On Mon, Jul 13, 2015 at 4:13 AM,  <dyoung@...hat.com> wrote:
> > Because there's general code need CONFIG_KEXEC_CORE, so I updated all the
> > architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects
> > KEXEC_CORE in arch Kconfig. Also updated general kernel code with
> > to kexec_load syscall.
> >
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> > ---
> >  arch/arm/Kconfig              |    4 +
> >  arch/ia64/Kconfig             |    4 +
> >  arch/m68k/Kconfig             |    4 +
> >  arch/mips/Kconfig             |    4 +
> >  arch/powerpc/Kconfig          |    4 +
> >  arch/sh/Kconfig               |    4 +
> >  arch/tile/Kconfig             |    4 +
> >  arch/x86/Kconfig              |    6 +-
> >  arch/x86/boot/header.S        |    2 +-
> >  arch/x86/include/asm/kdebug.h |    2 +-
> >  arch/x86/kernel/Makefile      |    4 +-
> >  arch/x86/kernel/kvmclock.c    |    4 +-
> >  arch/x86/kernel/reboot.c      |    4 +-
> >  arch/x86/kernel/setup.c       |    2 +-
> >  arch/x86/kernel/vmlinux.lds.S |    2 +-
> >  arch/x86/kvm/vmx.c            |    8 +-
> >  arch/x86/platform/efi/efi.c   |    4 +-
> >  arch/x86/platform/uv/uv_nmi.c |    6 +-
> >  drivers/firmware/efi/Kconfig  |    2 +-
> >  drivers/pci/pci-driver.c      |    2 +-
> >  include/linux/kexec.h         |   12 +-
> >  init/initramfs.c              |    4 +-
> >  kernel/Makefile               |    1 +
> >  kernel/events/core.c          |    2 +-
> >  kernel/kexec.c                | 1578 +---------------------------------------
> >  kernel/kexec_core.c           | 1594 +++++++++++++++++++++++++++++++++++++++++
> >  kernel/ksysfs.c               |    6 +-
> >  kernel/printk/printk.c        |    2 +-
> >  kernel/reboot.c               |    2 +-
> >  kernel/sysctl.c               |    2 +-
> >  30 files changed, 1668 insertions(+), 1611 deletions(-)
> >  create mode 100644 kernel/kexec_core.c
> >
> > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > index 1c50210..20c48b3 100644
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -2001,10 +2001,14 @@ config XIP_PHYS_ADDR
> >           be linked for and stored to.  This address is dependent on your
> >           own flash usage.
> >
> > +config KEXEC_CORE
> > +       bool
> > +
> >  config KEXEC
> >         bool "Kexec system call (EXPERIMENTAL)"
> >         depends on (!SMP || PM_SLEEP_SMP)
> >         depends on !CPU_V7M
> > +       select KEXEC_CORE
> >         help
> >           kexec is a system call that implements the ability to shutdown your
> >           current kernel, and to start another kernel.  It is like a reboot
> 
> As this KEXEC_CORE is appearing in all arch/*/Kconfig files, I think it's
> time to add an ARCH_HAS_KEXEC symbol (to a common Kconfig file),
> and let arch/*/Kconfig select that if the architecture has kexec support.
> 
> Then KEXEC and KEXEC_CORE can live in the common Kconfig file,
> without the need to duplicate it.

I'm not sure I understand your idea well, do you means like
in arch/Kconfig add ARCH_HAS_KEXEC which depends on KEXEC_CORE? 

How about simply move below chunk to arch/Kconfig instead of introducing
another ARCH_HAS_KEXEC:
config KEXEC_CORE
	bool


BTW, I found I missed one arch that is s390, I need update the patches
and resend.

Thanks
Dave
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