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problem with __get_dma_pages (failed to allocate memory)

Dear All,

I have a doubt about __get_dma_pages. When I am trying to allocate the
memory to a DMA buffer using the __get_dma_pages it is failed. 

I am using the 2.4.18-3 kernel version? 
The System contains 128MB RAM. I tried with 256MB RAM also.

What are the reasons to fail the __get_dma_pages call?

Please give me some hints or advices or any links that are related to
it.
Thanks in advance.

Regards,
Srinivas G



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