linux-kernel - Re: [PATCH v3 7/7] ARM: dma: use phys_addr_t in __dma_page_[cpu_to_dev/dev_to

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Message-ID: <20140424154519.GE14110@arm.com>
Date:	Thu, 24 Apr 2014 16:45:19 +0100
From:	Will Deacon <will.deacon@....com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v3 7/7] ARM: dma: use phys_addr_t in
 __dma_page_[cpu_to_dev/dev_to_cpu]

On Thu, Apr 24, 2014 at 04:30:07PM +0100, Santosh Shilimkar wrote:
> On a 32 bit ARM architecture with LPAE extension physical addresses
> cannot fit into unsigned long variable.
> 
> So fix it by using phys_addr_t instead of unsigned long.
> 
> Cc: Nicolas Pitre <nicolas.pitre@...aro.org>
> Cc: Russell King - ARM Linux <linux@....linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...com>
> ---
>  arch/arm/mm/dma-mapping.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Will Deacon <will.deacon@....com>

Will

> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index f62aa06..5260f43 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -885,7 +885,7 @@ static void dma_cache_maint_page(struct page *page, unsigned long offset,
>  static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
>  	size_t size, enum dma_data_direction dir)
>  {
> -	unsigned long paddr;
> +	phys_addr_t paddr;
>  
>  	dma_cache_maint_page(page, off, size, dir, dmac_map_area);
>  
> @@ -901,7 +901,7 @@ static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
>  static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
>  	size_t size, enum dma_data_direction dir)
>  {
> -	unsigned long paddr = page_to_phys(page) + off;
> +	phys_addr_t paddr = page_to_phys(page) + off;
>  
>  	/* FIXME: non-speculating: not required */
>  	/* don't bother invalidating if DMA to device */
> -- 
> 1.7.9.5
> 
> 
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