linux-kernel - Re: [PATCH -v12 02/15] resources: Add probe

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Message-ID: <CAE9FiQUXTngUZp2c2dLVRZjFxhXD9e+XYW6Pn0zaHvMt0fB+eA@mail.gmail.com>
Date:	Tue, 28 Aug 2012 09:09:48 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	David Miller <davem@...emloft.net>, x86 <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH -v12 02/15] resources: Add probe_resource()

On Tue, Jun 26, 2012 at 3:07 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Tue, Jun 26, 2012 at 11:53 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>> It is changed from busn_res only version, because Bjorn found that version
>> was not holding resource_lock.
>> Even it may be ok for busn_res not holding resource_lock.
>> It would be better to have it to be generic and use lock and we may
>> use it for other resources.
>>
>> probe_resource() will try to find specified size or more in parent bus.
>> If can not find current parent resource, and it will try to expand parents
>> top.
>> If still can not find that specified on top, it will try to reduce target size
>> until find one.
>>
>> It will return 0, if it find any resource that could be used.
>>
>> Returned resource is registered in the tree.
>> So caller may need to use replace_resource to put real resource in tree.
>>
>> -v3: remove two parameters that is for debug purpose.
>> -v4: fix stop_flags checking.
>> -v5: adjust stop_flags checking position to avoid not needed calling
>>        into allocate_resource().
>
> please check attached one that is updated after first patch with
> __allocate_resource changes.
> except this one and first one are changed. left ones are not needed to
> be updated.
> So i'm not going to resend them.

please check update one. -v7

Thanks

Yinghai

Download attachment "probe_resource_2.patch" of type "application/octet-stream" (8073 bytes)