linux-kernel - Re: [PATCH 1/4] add is_buffer_dma

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Date:	Tue, 9 Sep 2008 18:21:16 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] add is_buffer_dma_capable helper function

On Tue, Sep 09, 2008 at 09:17:05AM -0700, Luck, Tony wrote:
> +static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
> +{
> +       return addr + size <= mask;
> +}
> 
> Do we care about wrap-around (e.g. addr=0xffffffffffffffff size=2)?

I don't think so. The current code does not care about it and if it
happens its a bug in the iommu implementation.

Joerg

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