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From: Robin Murphy <robin.murphy@arm.com>
To: "Hook, Gary" <ghook@amd.com>,
	"Mehta, Sohil" <sohil.mehta@intel.com>,
	"gary.hook@amd.com" <gary.hook@amd.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 1/2] iommu - Enable debugfs exposure of the IOMMU
Date: Tue, 17 Apr 2018 18:55:49 +0100	[thread overview]
Message-ID: <80b1e9e5-3048-391a-6d7d-adeeece1bf46@arm.com> (raw)
In-Reply-To: <10e422dd-a3ca-8ecb-50fa-e7f131a55a12@amd.com>

On 17/04/18 18:36, Hook, Gary wrote:
> On 4/13/2018 7:55 PM, Mehta, Sohil wrote:
>> 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.
> 
> Ah, so it isn't. Thank you.
> 
>>
>>> +        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?
> 
> That works, yes.

Or I guess you could just roll the pr_warn() into the previous if() 
condition, i.e. only warn when the singleton debugfs_dir is actually 
created.

Robin.

> 
>>
>>> +    return iommu_debugfs_dir;
>>> +}
>>> +EXPORT_SYMBOL_GPL(iommu_debugfs_setup);
>>
>> -Sohil
>>
> 
> _______________________________________________
> iommu mailing list
> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2018-04-17 17:55 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-06 13:17 [PATCH v3 0/2] Base enablement of IOMMU debugfs support Gary R Hook
2018-04-06 13:17 ` [PATCH v3 1/2] iommu - Enable debugfs exposure of the IOMMU Gary R Hook
2018-04-13 23:55   ` Mehta, Sohil
2018-04-17 17:36     ` Hook, Gary
2018-04-17 17:55       ` Robin Murphy [this message]
2018-04-17 18:06         ` Hook, Gary
2018-04-17 17:46   ` Hook, Gary
2018-04-17 18:13     ` Robin Murphy
2018-04-06 13:17 ` [PATCH v3 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
2018-04-14  0:08   ` Mehta, Sohil
2018-04-17 17:38     ` Hook, Gary
2018-04-18  5:58       ` Yang, Shunyong
2018-04-18  7:27         ` Mehta, Sohil
2018-04-18  8:31           ` Yang, Shunyong
2018-04-18 20:16             ` Mehta, Sohil
2018-04-18 20:51               ` Hook, Gary
2018-04-19  1:52                 ` Yang, Shunyong
2018-04-30 19:57       ` Gary R Hook
2018-04-17  0:52   ` Mehta, Sohil
2018-04-17 17:42     ` Hook, Gary
2018-04-17 18:05       ` Robin Murphy

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