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<div class="gmail_quote">On Fri, May 27, 2011 at 10:54 PM, Mulyadi Santosa <span dir="ltr"><<a href="mailto:mulyadi.santosa@gmail.com">mulyadi.santosa@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Hi...<br>
<div class="im"><br>On Fri, May 27, 2011 at 17:49, sandeep kumar <<a href="mailto:coolsandyforyou@gmail.com">coolsandyforyou@gmail.com</a>> wrote:<br>> Now the question is can we memory map a one device resource(say some<br>
> iomemory) to two different memory locations?<br>> the other way of seeing at this question is,<br>> Will ioremap() gives different 'virtual addresses' when called multiple<br>> times?<br><br></div>I agree with Daniel, but I suggest you to think about it: in reading<br>
operation, maybe it's ok, no concurrency issues need to be taken<br>care...but how about writing? unless we're sure they are atomically or<br>uninterruptible, i see a chance that race condition might happen here.<br>
<br>Actually it's similar when you map a file into two different VMA and<br>write into it, correct?<br></blockquote>
<div><font color="#888888"><font color="#000000">Don't you think it would also be reducing the memory map space in RAM </font></font></div>
<div><font color="#888888"><font color="#000000">which is a critical resource and many other drivers would be denied</font></font></div>
<div>the mapping of there IO resources?<font color="#888888"><font color="#000000"> </font><br>--<br>regards,<br><br>Mulyadi Santosa<br>Freelance Linux trainer and consultant<br><br>blog: <a href="http://the-hydra.blogspot.com/" target="_blank">the-hydra.blogspot.com</a><br>
training: <a href="http://mulyaditraining.blogspot.com/" target="_blank">mulyaditraining.blogspot.com</a><br></font></div>
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