Message-ID: <43DA2ADA.4070309@drzeus.cx>
Date: Fri, 27 Jan 2006 15:14:50 +0100
From: Pierre Ossman <drzeus-list@drzeus.cx>
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To: Jens Axboe <axboe@suse.de>
CC: Russell King <rmk+lkml@arm.linux.org.uk>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: How to map high memory for block io
References: <43D9C19F.7090707@drzeus.cx> <20060127102611.GC4311@suse.de> <43D9F705.5000403@drzeus.cx> <20060127104321.GE4311@suse.de> <43DA0E97.5030504@drzeus.cx> <20060127123917.GI4311@suse.de> <43DA1D23.1000508@drzeus.cx> <43DA24A0.70004@drzeus.cx> <20060127140030.GL4311@suse.de>
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Jens Axboe wrote:
> On Fri, Jan 27 2006, Pierre Ossman wrote:
>   
>>
>> If I set the limit to BLK_BOUNCE_HIGH then (page_address(sg->page) +
>> sg->offset) is guaranteed to be directly accessible for the entire
>> sg->length on all architectures, right? This seems to be the assumption
>> in the USB ub driver at least.
>>     
>
> Yes, hence my initial suggestion to just do that.
>
>   

Just making sure I understood it correctly. These bugs tend to be a pain
to debug so I'd prefer to get it right from the start. :)

Thanks for the help.

Rgds
Pierre


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