tree 503946923a498b938aa849457310ceedaefbd806
parent f95499c3030fe1bfad57745f2db1959c5b43dca8
author Peter Hurley <peter@hurleysoftware.com> 1371302070 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1374622982 -0700

n_tty: Separate buffer indices to prevent cache-line sharing

If the read buffer indices are in the same cache-line, cpus will
contended over the cache-line (so called 'false sharing').

Separate the producer-published fields from the consumer-published
fields; document the locks relevant to each field.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>