Other than its comment says, this c/s doesn't only subtract 1 from r_align, but
also extends the surrounding condition to include !r_align. If r_align is zero,
ALIGN(r_align, PAGE_SIZE) will be zero too, and hence in the end r_align
will become ~0. What's the purpose of all that? Or am I missing something
here? Or is the added condition perhaps just inverted?
Thanks, Jan
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