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SubjectRe: [PATCH 04/13] vmcore: introduce types for objects copied in 2nd kernel
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From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH 04/13] vmcore: introduce types for objects copied in 2nd kernel
Date: Fri, 15 Feb 2013 10:28:28 -0500

> On Thu, Feb 14, 2013 at 07:12:05PM +0900, HATAYAMA Daisuke wrote:
>> Some parts of old memory need to be copied in buffers on 2nd kernel to
>> be remapped to user-space. To distinguish objects in the buffer on 2nd
>> kernel and the ones on old memory, enum vmcore_type is introduced: the
>> object in the buffer on 2nd kernel has VMCORE_2ND_KERNEL type, and the
>> one on old memory has VMCORE_OLD_MEMORY type.
>>
>> Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
>> ---
>>
>> include/linux/proc_fs.h | 11 ++++++++++-
>> 1 files changed, 10 insertions(+), 1 deletions(-)
>>
>> diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
>> index 32676b3..4b153ed 100644
>> --- a/include/linux/proc_fs.h
>> +++ b/include/linux/proc_fs.h
>> @@ -97,11 +97,20 @@ struct kcore_list {
>> int type;
>> };
>>
>> +enum vmcore_type {
>> + VMCORE_OLD_MEMORY,
>> + VMCORE_2ND_KERNEL,
>
> This VMCORE_2ND_KERNEL tag looks bad.
>
> How about introducing a "unsigned int flag" element in "struct vmcore"
> and set the flag MEM_TYPE_OLDMEM for any contents which come from oldmem.
>
> If MEM_TYPE_OLDMEM is not set, it is assumed that contents are to be
> fetched from current kernel using pointer vmcore->buf.

This sounds strange to me. There has not been contents to be fetched
from current kenrel so far. So, object with MEM_TYPE_OLDMEM seems more
normal than without. Should we prepare special type for objects in 2nd
kernel?

Thanks.
HATAYAMA, Daisuke



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