linux-kernel - Re: [PATCH v2 06/20] vmcore, procfs: introduce a flag to distinguish objects copied in 2nd kernel

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Message-ID: <CANBD6kF=B7UqxaoxY_Uhua2m7nQnXf2Xk_hWMCZcP6_0vcLpsQ@mail.gmail.com>
Date:	Wed, 6 Mar 2013 23:55:58 +0800
From:	Yanfei Zhang <zhangyanfei.yes@...il.com>
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Cc:	vgoyal@...hat.com, ebiederm@...ssion.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	heiko.carstens@...ibm.com, akpm@...ux-foundation.org,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/20] vmcore, procfs: introduce a flag to distinguish
 objects copied in 2nd kernel

2013/3/2 HATAYAMA Daisuke <d.hatayama@...fujitsu.com>:
> The part of dump target memory is copied into the 2nd kernel if it
> doesn't satisfy mmap()'s page-size boundary requirement. To
> distinguish such copied object from usual old memory, a flag
> MEM_TYPE_CURRENT_KERNEL is introduced. If this flag is set, the object
> is considered being copied into buffer on the 2nd kernel.

Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>

>
> Signed-off-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
> ---
>
>  include/linux/proc_fs.h |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
> index 8307f2f..11dd592 100644
> --- a/include/linux/proc_fs.h
> +++ b/include/linux/proc_fs.h
> @@ -97,11 +97,17 @@ struct kcore_list {
>         int type;
>  };
>
> +#define MEM_TYPE_CURRENT_KERNEL 0x1
> +
>  struct vmcore {
>         struct list_head list;
> -       unsigned long long paddr;
> +       union {
> +               unsigned long long paddr;
> +               char *buf;
> +       };
>         unsigned long long size;
>         loff_t offset;
> +       unsigned int flag;
>  };
>
>  #ifdef CONFIG_PROC_FS
>
> --
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