[PATCH 1/2] serial: amba-pl011: use cpu_relax when polling registers

[Greg Kroah-Hartman]

On Tue, Nov 03, 2015 at 09:01:06AM -0600, Timur Tabi wrote:
> Busy loops that poll on a register should call cpu_relax().  On some
> architectures, it can lower CPU power consumption or yield to a
> hyperthreaded twin processor.  It also serves as a compiler barrier,
> so it can replace barrier() calls.
> 
> Signed-off-by: Timur Tabi <timur at codeaurora.org>
> Reviewed-by: Peter Hurley <peter at hurleysoftware.com>
> ---
>  drivers/tty/serial/amba-pl011.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 

Doesn't apply to my tree :(