linux-kernel - Re: One problem in reassign pci bus number?

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Message-ID: <CAE9FiQWsSWK-_zGe1ggaKuZu+RJ1kb1zuTEokdxqFSbE3UjNRw@mail.gmail.com>
Date:	Sun, 6 May 2012 09:35:44 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Richard Yang <weiyang@...ux.vnet.ibm.com>
Cc:	Wei Yang <weiyang.kernel@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: One problem in reassign pci bus number?

On Sun, May 6, 2012 at 8:17 AM, Richard Yang <weiyang@...ux.vnet.ibm.com> wrote:
> On Fri, May 04, 2012 at 10:37:08AM -0700, Yinghai Lu wrote:
>>On Thu, May 3, 2012 at 9:52 PM, Richard Yang <weiyang@...ux.vnet.ibm.com> wrote:
>>>
>>> BTW, even if this value is returned by __find_res_top_free_size(), or
>>> returned after this function is called, the purpose of the
>>> __find_res_top_free_size() is to get the biggest free space under the
>>> first parameter?
>>
>>__find_res_top_free_size() is used to get size just under top,  and
>>then use it to calculate size above top that need to be extended.
>>
>>at last will combine free size under top and allocated size above top
>>and return.
> Yes, I get the general idea.
>
> then I want to confirm which size __find_res_top_free_size() will return.
>
> Come to the previous question, for one resource like this.
> res =   90-150
>    ->child      105-140
> We call __find_res_top_free_size(res, 1);
> This function should return which size?  10? 15? or 25?
>
> From the code
> +               ret = __allocate_resource(res, &tmp_res, n_size,
> +                       res->end - n_size + skip_nr, res->end,
> +                       1, NULL, NULL, false);
> I think it will check the free space near the end of res.

yes. it is 15, [141-150]
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