Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2]

[David Howells]

How about:

 * We use head and tail indices that aren't masked off, except at the
 * point of dereference, but rather they're allowed to wrap naturally.
 * This means there isn't a dead spot in the buffer, provided the ring
 * size is a power of two and <= 2^31.

David