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Date: Tue, 09 Oct 2007 18:08:05 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: "Huang, Ying" <ying.huang@...el.com>
CC: Andi Kleen <ak@...e.de>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
akpm@...ux-foundation.org, Yinghai Lu <yhlu.kernel@...il.com>,
Chandramouli Narayanan <mouli@...ux.intel.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm -v4 0/3] i386/x86_64 boot: 32-bit boot protocol
Huang, Ying wrote:
> On Tue, 2007-10-09 at 12:23 -0700, H. Peter Anvin wrote:
>> Huang, Ying wrote:
>>> - Which fields of boot parameters should be exported directly in
>>> sysfs? Export all fields of boot parameters in sysfs is too complex
>>> and unnecessary. Which fields should be?
>>>
>> The main this is that since this is a fixed-format, ABI-defined
>> structure, regardless of individual fields it should be exported as a
>> binary object. That is also the only way to deal with a kernel which
>> may not itself know about specific items making the data available to
>> other users, like kexec.
>>
>> It's not clear to me from reading the code what model you're using for
>> exporting this data in sysfs. Could you describe it in some detail?
>>
>> What I had envisioned would be an object for the boot_params structure
>> and a systematic object for each linked-list object, at a very minimum.
>>
>
> OK. The directory structure is as follow:
>
> + sys + kernel + boot_params - version /* version of boot protocol */
> - data /* binary file of boot_params */
> + setup_data + 0 - type /* type id of setup_data 0 */
> - data /* binary file of setup_data 0 */
> + 1 - type /* type id of setup_data 1 */
> - data /* binary file of setup_data 1 */
> + 2 - type
> - data
> ...
>
Looks good to me.
-hpa
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