linux-kernel - Re: [PATCH 05/12][RFC v3] x86-32, hibernate: Enable CONFIG_ARCH_HIBERNATION

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Date:   Wed, 19 Sep 2018 12:31:42 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Chen, Yu C" <yu.c.chen@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        kookoo.gu@...el.com
Subject: Re: [PATCH 05/12][RFC v3] x86-32, hibernate: Enable
 CONFIG_ARCH_HIBERNATION_HEADER set on 32bit system

On Wed, Sep 19, 2018 at 9:32 AM Chen Yu <yu.c.chen@...el.com> wrote:
>
> From: Zhimin Gu <kookoo.gu@...el.com>
>
> Enable CONFIG_ARCH_HIBERNATION_HEADER for 32bit system so that
> md5 check is enabled and prepare for relocated code executing
> and jump address mapping.
>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Signed-off-by: Zhimin Gu <kookoo.gu@...el.com>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
>  arch/x86/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 1a0be022f91d..e8de5de1057f 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2422,7 +2422,7 @@ menu "Power management and ACPI options"
>
>  config ARCH_HIBERNATION_HEADER
>         def_bool y
> -       depends on X86_64 && HIBERNATION
> +       depends on HIBERNATION
>
>  source "kernel/power/Kconfig"
>
> --

In this patch, in addition to the above, I would start moving the code
in hibernate.c that you want to be common in the end out of #ifdef
CONFIG_X86_64 blocks.

To start with, that would be the checksum handling code and the parts
of arch_hibernation_header_save/restore() that refer to it and the
"magic" value.

I would continue doing that in the subsequent patches to make it
easier to follow which pieces of code start to be used on 32-bit after
each patch.  The impact of each patch would be more clear this way
IMO.

Thanks,
Rafael