linux-kernel - RE: [PATCH v6 3/4] iommufd: Add IOMMU_GET_HW

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Message-ID: <DS0PR11MB752929F059690A48A105062DC313A@DS0PR11MB7529.namprd11.prod.outlook.com>
Date:   Thu, 10 Aug 2023 03:35:36 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>
Subject: RE: [PATCH v6 3/4] iommufd: Add IOMMU_GET_HW_INFO

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Thursday, August 10, 2023 12:44 AM
> 
> On Tue, Aug 08, 2023 at 08:35:09AM -0700, Yi Liu wrote:
> > +static int iommufd_zero_fill_user(void __user *ptr, size_t bytes)
> > +{
> > +	int index = 0;
> > +
> > +	for (; index < bytes; index++) {
> > +		if (put_user(0, (uint8_t __user *)(ptr + index)))
> > +			return -EFAULT;
> > +	}
> 
> I've recently learned this routine is spelled 'clear_user()'

I see. Will replace with it.

Regards,
Yi Liu