diff options
| author |   Timur Tabi <timur@codeaurora.org> | 2016-01-15 14:32:20 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-06 22:51:04 -0800 |
| commit | 2f2fd0894991a04bf3581104d5ea3a8dc9a4f01f (patch) | |
| tree | 3155722dc4b757a1cb13a34ef1e6c1d31261d2c8 /include/linux | |
| parent | sc16is7xx: fix incorrect register bits macro (diff) | |
serial: amba-pl011: use cpu_relax when polling registers
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@codeaurora.org>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions