linux-kernel - Re: [PATCH v8 1/2] iommu - Enable debugfs exposure of IOMMU driver internals

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Message-ID: <bfee19e5-7953-7bda-2c46-9dbb4d002512@amd.com>
Date:   Tue, 12 Jun 2018 13:39:04 -0500
From:   Gary R Hook <gary.hook@....com>
To:     Greg KH <greg@...ah.com>
Cc:     iommu@...ts.linux-foundation.org, joro@...tes.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/2] iommu - Enable debugfs exposure of IOMMU driver
 internals

On 06/05/2018 12:08 PM, Greg KH wrote:
> On Tue, Jun 05, 2018 at 12:01:41PM -0500, Gary R Hook wrote:
>>>> +/**
>>>> + * iommu_debugfs_new_driver_dir - create a vendor directory under debugfs/iommu
>>>> + * @vendor: name of the vendor-specific subdirectory to create
>>>> + *
>>>> + * This function is called by an IOMMU driver to create the top-level debugfs
>>>> + * directory for that driver.
>>>> + *
>>>> + * Return: upon success, a pointer to the dentry for the new directory.
>>>> + *         NULL in case of failure.
>>>> + */
>>>> +struct dentry *iommu_debugfs_new_driver_dir(const char *vendor)
>>>> +{
>>>> +	struct dentry *d_new;
>>>> +
>>>> +	d_new = debugfs_create_dir(vendor, iommu_debugfs_dir);
>>>> +
>>>> +	return d_new;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(iommu_debugfs_new_driver_dir);
>>>
>>> Why are you wrapping a debugfs call?  Why not just export
>>> iommu_debugfs_dir instead?
>>
>> It was a choice, as I stated in my other post. It is not a requirement.
>> If you resolutely reject this approach, that's fine. I'll change it, no
>> worries.
> 
> Either is fine, but if it stays, it should stay a single line function
> :)
> 
> thanks,
> 
> greg k-h
> 

Then I shall leave it as a black-box function. Single line, of course.

Thank you.