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| 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 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | b7ed5161f17a39ed09fd799a919b5f6de688251d (diff) | |
| download | linux-2f2fd0894991a04bf3581104d5ea3a8dc9a4f01f.tar.gz linux-2f2fd0894991a04bf3581104d5ea3a8dc9a4f01f.zip | |
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 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions