Subject: [PATCH] ARM: MM: Simplify using vma_pages function

From: [email-masked] (Marek Szyprowski)
Date: Wed, 25 Nov 2015 12:02:59 +0100

Hello,

On 2015-11-24 08:38, Mutharaju, Prasanna (P.) wrote:
> From: Prasanna Karthik <[email-masked]>
>
> Use vma_pages function on vma object instead of explicit computation.
>
> Signed-off-by: Prasanna Karthik <[email-masked]>

Acked-by: Marek Szyprowski <[email-masked]>

> ---
>   arch/arm/mm/dma-mapping.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index ad4eb2d..513e213 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -694,7 +694,7 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
>   {
>   	int ret = -ENXIO;
>   #ifdef CONFIG_MMU
> -	unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
> +	unsigned long nr_vma_pages = vma_pages(vma);
>   	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
>   	unsigned long pfn = dma_to_pfn(dev, dma_addr);
>   	unsigned long off = vma->vm_pgoff;

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland