I've always thinked that paging or virtual memory was practical to avoid memory fragmentation. I thinked that you can map contiguous virtual pages to non contiguous physical page frames.
But let's take a look at the macros __va(x) and __pa(x) :
#define __pa(x) ((unsigned long)x-PAGE_OFFSET)
#define __va(x) ((unsigned long)x+PAGE_OFFSET)
PAGE_OFFSET is a constant. For me, this means that virtual contiguous adresses have to be mapped to contiguous physical adresses. Am I wrong ?:)
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