linux-kernel - __get_free_pages() on an ia64

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Date:	Tue, 26 Sep 2006 18:46:40 +0530
From:	Adhiraj <adhiraj@...syssoft.com>
To:	linux-kernel@...r.kernel.org
Subject: __get_free_pages() on an ia64

Hi All,

I found a strange thing on ia64 platform. When I allocate pages using
__get_free_pages() with GFP_DMA, sometimes the physical addresses of
allocated pages fall beyond 4G.

I am working on a device driver where the device does not support
addresses above 4G and hence I have to implement bounce buffers. The
bounce buffer code works fine on other architectures. But since I get 
4G+ addresses on ia64, the code would not work. Any idea why should this
happen? And any workaround if I _NEED_ addresses below 4G. The machine
has 2G of physical memory.

The dma mask is set to 64 bits using pci_set_dma_mask().

Thanks in advance,
Adhiraj.

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