Re: [linuxsh-dev] mmap caching problem

[arun4linux <aru...@in...>]

Hello,


I'm also using mmap to export hardware personality to the user/application space.


I'd like to know the exact problem faced by you, how did you detect/proceed to avoid surprise in my solution.


Thanks and Regards


Arun

"peter garrone" wrote:



I ported a device driver that used mmap so that a user space application shared a page with the interrupt routine in a device driver. The mapping software generally followed the "nopage" code outlined in Rubini's book.

I found a caching problem in that the memory contents as seen from the device driver differed to that seen from user space.

At the moment I am changing the design of my driver so that the mapping is unnecessary. I thought I would mention this though before I go to the effort of analying the problem further. 
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