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

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Message-ID: <CAMuHMdUjz7gvEfQ0q=oBO5GRfXFYLwPatr3yE56e4=43V=5gWg@mail.gmail.com>
Date:	Mon, 13 Jul 2015 10:55:33 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	dyoung@...hat.com
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

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.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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