linux-kernel - Re: [PATCHv2 6/9] iommu/dma-iommu.c: Convert to use vm_insert

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Message-ID: <CAFqt6zbw4wbjMYjRs_Sy6BegzqOSq_YK27rhjHw_dr_jR8neAw@mail.gmail.com>
Date:   Sun, 3 Feb 2019 17:42:09 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, joro@...tes.org,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        robin.murphy@....com
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCHv2 6/9] iommu/dma-iommu.c: Convert to use vm_insert_range

Hi Joerg,

On Thu, Jan 31, 2019 at 8:38 AM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> Convert to use vm_insert_range() to map range of kernel
> memory to user vma.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>

Can you please help to review this patch ?

> ---
>  drivers/iommu/dma-iommu.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index d19f3d6..bdf14b87 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -620,17 +620,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
>
>  int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma)
>  {
> -       unsigned long uaddr = vma->vm_start;
> -       unsigned int i, count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> -       int ret = -ENXIO;
> -
> -       for (i = vma->vm_pgoff; i < count && uaddr < vma->vm_end; i++) {
> -               ret = vm_insert_page(vma, uaddr, pages[i]);
> -               if (ret)
> -                       break;
> -               uaddr += PAGE_SIZE;
> -       }
> -       return ret;
> +       return vm_insert_range(vma, pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
>  }
>
>  static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
> --
> 1.9.1
>