Zach Brown writes:
But couldn't we use make_pages_present() to figure which locks we need, sort them, and then grab them?
Doh, obviously we can't as nopage() needs to bring the page in. Sorry about that. I also thought of another failure case for the vma walk. When a thread uses userspace memcpy() between two clusterfs mmap'd regions instead of write() or read(). Pekka -
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