linux-kernel - RE: [PATCH v2 1/2] iommu/vt-d: convert the return type of first_pte_in

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Date:   Thu, 7 Oct 2021 11:43:18 +0000
From:   "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" 
        <longpeng2@...wei.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "will@...nel.org" <will@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>
CC:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gonglei (Arei)" <arei.gonglei@...wei.com>
Subject: RE: [PATCH v2 1/2] iommu/vt-d: convert the return type of
 first_pte_in_page to bool



> -----Original Message-----
> From: Lu Baolu [mailto:baolu.lu@...ux.intel.com]
> Sent: Thursday, October 7, 2021 2:18 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@...wei.com>; dwmw2@...radead.org; will@...nel.org;
> joro@...tes.org
> Cc: baolu.lu@...ux.intel.com; iommu@...ts.linux-foundation.org;
> linux-kernel@...r.kernel.org; Gonglei (Arei) <arei.gonglei@...wei.com>
> Subject: Re: [PATCH v2 1/2] iommu/vt-d: convert the return type of
> first_pte_in_page to bool
> 
> On 2021/10/5 23:23, Longpeng(Mike) wrote:
> > first_pte_in_page() returns boolean value, so let's convert its
> > return type to bool.
> >
> > Signed-off-by: Longpeng(Mike) <longpeng2@...wei.com>
> > ---
> >   include/linux/intel-iommu.h | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> > index 05a65eb..a590b00 100644
> > --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -708,7 +708,7 @@ static inline bool dma_pte_superpage(struct dma_pte *pte)
> >   	return (pte->val & DMA_PTE_LARGE_PAGE);
> >   }
> >
> > -static inline int first_pte_in_page(struct dma_pte *pte)
> > +static inline bool first_pte_in_page(struct dma_pte *pte)
> >   {
> >   	return !((unsigned long)pte & ~VTD_PAGE_MASK);
> >   }
> >
> 
> Probably,
> 
> 	return IS_ALIGNED((unsigned long)pte, VTD_PAGE_SIZE);
> 
> looks neater?
> 

Looks better! I'll include this optimization in v3.

> Best regards,
> baolu