linux-kernel - Re: [PATCH] arm64: allow ioremap_cache() to use existing RAM mappings

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Date:	Wed, 23 Oct 2013 10:18:18 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	"msalter@...hat.com" <msalter@...hat.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: allow ioremap_cache() to use existing RAM
 mappings

On Mon, 2013-10-21 at 14:36 +0100, msalter@...hat.com wrote:
> diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
> index 1725cd6..fb44b3d 100644
> --- a/arch/arm64/mm/ioremap.c
> +++ b/arch/arm64/mm/ioremap.c
> @@ -79,6 +79,21 @@ void __iounmap(volatile void __iomem *io_addr)
>  {
>  	void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
>  
> +	/* Nothing to do for normal memory. See ioremap_cache() */
> +	if (pfn_valid(__virt_to_phys(addr) >> PAGE_SHIFT))
> +		return;

addr here can be some I/O address mapped previously, so __virt_to_phys()
is not valid (you don't actually get the pfn by shifting).

Catalin


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