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> "num_pages" is usually just equal to 1.  This code appears to work very well.
> However, when I call the iounmap function on the memory obtained via
> ioremap_nocache, sometimes I hit a kernel BUG(). The code which causes the bug
> is in page_alloc.c, line 85 (in function __free_pages_ok):
>
> if (page->buffers)
> BUG();

This sounds like you are trying to do maps on pages that are in use. No can do

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