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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Joe Perches <joe@perches.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v4 8/8] iommu/vt-d: Misc macro clean up for SVM
Date: Mon, 2 Dec 2019 10:15:53 -0800
Message-ID: <20191202101553.079898a3@jacob-builder> (raw)
In-Reply-To: <38d4586f3aeb21bb08028525db89868acb34e9fd.camel@perches.com>

On Thu, 21 Nov 2019 13:37:10 -0800
Joe Perches <joe@perches.com> wrote:

> On Thu, 2019-11-21 at 13:26 -0800, Jacob Pan wrote:
> > Use combined macros for_each_svm_dev() to simplify SVM device
> > iteration and error checking.  
> []
> > diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c  
> []
> > +#define for_each_svm_dev(sdev, svm, d)			\
> > +	list_for_each_entry((sdev), &(svm)->devs, list)	\
> > +		if ((d) != (sdev)->dev) {} else
> > +
> >  int intel_svm_bind_mm(struct device *dev, int *pasid, int flags,
> > struct svm_dev_ops *ops) {
> >  	struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
> > @@ -274,15 +278,13 @@ int intel_svm_bind_mm(struct device *dev, int
> > *pasid, int flags, struct svm_dev_ goto out;
> >  			}
> >  
> > -			list_for_each_entry(sdev, &svm->devs,
> > list) {
> > -				if (dev == sdev->dev) {
> > -					if (sdev->ops != ops) {
> > -						ret = -EBUSY;
> > -						goto out;
> > -					}
> > -					sdev->users++;
> > -					goto success;
> > +			for_each_svm_dev(sdev, svm, dev) {
> > +				if (sdev->ops != ops) {
> > +					ret = -EBUSY;
> > +					goto out;
> >  				}
> > +				sdev->users++;
> > +				goto success;
> >  			}  
> 
> I think this does not read better as this is now a
> for_each loop that exits the loop on the first match.
> 
I think one of the benefits is reduced indentation. What do you
recommend?

> >  
> >  			break;
> > @@ -427,43 +429,36 @@ int intel_svm_unbind_mm(struct device *dev,
> > int pasid) goto out;
> >  	}
> >  
> > -	if (!svm)
> > -		goto out;
> > -
> > -	list_for_each_entry(sdev, &svm->devs, list) {  
> []
> > +	for_each_svm_dev(sdev, svm, dev) {  
> 
> I think this should not remove the !svm test above.
> 
Yeah, !svm test should have been part of 6/8. I will fix that.

Thanks,

Jacob 
> 

[Jacob Pan]
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  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-21 21:26 [PATCH v4 0/8] VT-d Native Shared virtual memory cleanup and fixes Jacob Pan
2019-11-21 21:26 ` [PATCH v4 1/8] iommu/vt-d: Fix CPU and IOMMU SVM feature matching checks Jacob Pan
2019-11-21 21:26 ` [PATCH v4 2/8] iommu/vt-d: Match CPU and IOMMU paging mode Jacob Pan
2019-11-21 21:26 ` [PATCH v4 3/8] iommu/vt-d: Reject SVM bind for failed capability check Jacob Pan
2019-11-21 21:26 ` [PATCH v4 4/8] iommu/vt-d: Avoid duplicated code for PASID setup Jacob Pan
2019-11-21 21:26 ` [PATCH v4 5/8] iommu/vt-d: Fix off-by-one in PASID allocation Jacob Pan
2019-11-21 21:26 ` [PATCH v4 6/8] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Jacob Pan
2019-11-21 21:26 ` [PATCH v4 7/8] iommu/vt-d: Avoid sending invalid page response Jacob Pan
2019-11-21 21:26 ` [PATCH v4 8/8] iommu/vt-d: Misc macro clean up for SVM Jacob Pan
2019-11-21 21:37   ` Joe Perches
2019-12-02 18:15     ` Jacob Pan [this message]
2019-12-02 18:22       ` Joe Perches
2019-12-02 19:51         ` Jacob Pan

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