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Subject: Re: BUG: invalid MAX_DMA_ADDRESS macro for i386?
To: set@pobox.com (Paul)
Date: Thu, 2 Aug 2001 15:19:56 +0100 (BST)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20010801011651.K225@squish.home.loc> from "Paul" at Aug 01, 2001 01:16:52 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> 	Well, I have tracked down my problem. We see a comparison
> like this to  determine whether to use a bounce buffer:
> 
> if ( virt_to_bus(addr+buflen) >= MAX_DMA_ADDRESS) {
> ...(use a bounce buffer 'cause that addr is not dma-able)...
> 
> 	This is not working, because MAX_DMA_ADDRESS is defined
> so:
> 
> ./include/asm-i386/dma.h:
> #define MAX_DMA_ADDRESS (PAGE_OFFSET+0x1000000)

MAX_DMA_ADDRESS is intended for checking virtual addresses not bus
addresses. 

Alan