> unsigned long test_data;
>
> int init_module(void)
> {
> void *virt = &test_data;
> unsigned long phys = virt_to_phys(virt);
>
> When I run this and check the valur of virt and phys, it appears that phys is
> outside the range of physical memory! That is, if I have 512MB of RAM, then
> phys is equal to about 520M. However, if I make test_data a local variable:
Module data isnt guaranteed to be in dmaable memory (nor btw is the stack but
you were lucky). If you want to use virt_to_bus() and friends for stuff like
DMA you must kmalloc the buffers
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