linux-kernel - Some questions about high memory

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Message-ID: <CANudz+uhw4LZ4EoDvp_eC2K23=Qm_ACPpM8TRq5p0t9=idKcSg@mail.gmail.com>
Date:	Fri, 6 Apr 2012 10:19:19 +0800
From:	loody <miloody@...il.com>
To:	kernelnewbies@...nelnewbies.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Some questions about high memory

hi all:
I am trying to write a driver for my block device which dma support
high memory copying.
I have register my device as "blk_bounce_any".
But my driver cannot see block layer pass high memory to me so far.

Is there any user/kernel test program which will purposely send high
memory for driver to use?
or is there any flag when opening a file in user mode that will use high memory?

-- 
Thanks for your help in advance,
--
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