tree 30f93cc20aa577ec5b12f609641fdf84d0bd5124
parent 270c10e00a1e557e068803a22e0556281ceb1830
author David S. Miller <davem@davemloft.net> 1351404041 -0700
committer David S. Miller <davem@davemloft.net> 1351404041 -0700

sparc64: Use pause instruction when available.

In atomic backoff and cpu_relax(), use the pause instruction
found on SPARC-T4 and later.

It makes the cpu strand unselectable for the given number of
cycles, unless an intervening disrupting trap occurs.

Signed-off-by: David S. Miller <davem@davemloft.net>