Bryan> We're mapping some memory that the chip DMAs to into
Bryan> userspace, so that user processes can spin on memory
Bryan> locations without going through the kernel. The
Bryan> SetPageReserved hack is an attempt to stop the VM from
Bryan> reclaiming those pages from us once a user process exits.
Bryan> I realise that it's surely bogus, and I'd be thrilled to do
Bryan> something correct instead. We've tried doing both
Bryan> SetPageReserved and get_page, but it hasn't work out too
Bryan> well so far.
What's wrong with doing get_page()? Surely the VM won't take pages
that you hold a reference to.
- R.
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