linux-kernel - Re: [PATCH v3 1/2] iommu - Enable debugfs exposure of the IOMMU

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Date:   Fri, 13 Apr 2018 23:55:13 +0000
From:   "Mehta, Sohil" <sohil.mehta@...el.com>
To:     "gary.hook@....com" <gary.hook@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] iommu - Enable debugfs exposure of the IOMMU

On Fri, 2018-04-06 at 08:17 -0500, Gary R Hook wrote:
> 
> 
> +struct dentry *iommu_debugfs_setup(void)
> +{
> +	if (!debugfs_initialized())

This check is probably not needed.

> +		return NULL;
> +
> +	if (!iommu_debugfs_dir)
> +		iommu_debugfs_dir = debugfs_create_dir("iommu",
> NULL);
> +
> +	if (iommu_debugfs_dir)
> +		pr_warn("WARNING: IOMMU DEBUGFS SUPPORT HAS BEEN
> ENABLED IN THIS KERNEL\n");
> +

As this gets called for each IOMMU, do you want to use pr_warn_once?

> +	return iommu_debugfs_dir;
> +}
> +EXPORT_SYMBOL_GPL(iommu_debugfs_setup);

-Sohil