linux-kernel - Re: [PATCH v5 03/19] ARM: LPAE: Use unsigned long for __phys_to_virt and __virt_to

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Date:	Sun, 8 May 2011 22:44:37 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 03/19] ARM: LPAE: Use unsigned long for
	__phys_to_virt and __virt_to_phys

On Sun, May 08, 2011 at 01:51:22PM +0100, Catalin Marinas wrote:
> The !CONFIG_ARM_PATCH_PHYS_VIRT case uses macros for __phys_to_virt and
> __virt_to_phys but does not use any type casting. This causes issues

It might be a good idea to include the compiler warning message in the
commit log, so that the 'issues' being addressed are readily known.

> with LPAE where the phys_addr_t is 64-bit. Note that these macros are
> only valid for lowmem physical addresses where the range is within
> 32-bit.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  arch/arm/include/asm/memory.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index 431077c..10e4b4c 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -194,8 +194,8 @@ static inline unsigned long __phys_to_virt(unsigned long x)
>  	return t;
>  }
>  #else
> -#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
> -#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
> +#define __virt_to_phys(x)	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
> +#define __phys_to_virt(x)	((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET)
>  #endif
>  #endif
>  
> 
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