linux-kernel - Re: [PATCH 1/3] iommu/vt-d: Refactor find

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Message-ID: <7c1b26a6-0caa-ae42-4fc6-967901fb9bbc@linux.intel.com>
Date:   Fri, 2 Aug 2019 10:06:35 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@....de>
Cc:     baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, kevin.tian@...el.com,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH 1/3] iommu/vt-d: Refactor find_domain() helper

Hi,

On 8/1/19 10:09 PM, Christoph Hellwig wrote:
> On Thu, Aug 01, 2019 at 02:20:07PM +0800, Lu Baolu wrote:
>> Hi Christoph,
>>
>> On 8/1/19 2:10 PM, Christoph Hellwig wrote:
>>> On Thu, Aug 01, 2019 at 02:01:54PM +0800, Lu Baolu wrote:
>>>> +	/* No lock here, assumes no domain exit in normal case */
>>>
>>> s/exit/exists/ ?
>>
>> This comment is just moved from one place to another in this patch.
>>
>> "no domain exit" means "the domain isn't freed". (my understand)
> 
> Maybe we'll get that refconfirmed and can fix up the comment?

Sure.

> 
>>
>>>
>>>> +	info = dev->archdata.iommu;
>>>> +	if (likely(info))
>>>> +		return info->domain;
>>>
>>> But then again the likely would be odd.
>>>
>>
>> Normally there's a domain for a device (default domain or isolation
>> domain for assignment cases).
> 
> Makes sense, I just mean to say that the likely was contrary to my
> understanding of the above comment.
> 

Best regards,
Baolu