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Subject[PATCH] Remove useless test during exchanging values
Date
The value delta is correct as well, although calc_load_idle[idx] is
equal to 0. Remove this useless test to improve performance, since this
function is called more frequently.

Signed-off-by: Minfei Huang <mnghuan@gmail.com>
---
kernel/sched/loadavg.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/loadavg.c b/kernel/sched/loadavg.c
index ef71590..5a5d7ae 100644
--- a/kernel/sched/loadavg.c
+++ b/kernel/sched/loadavg.c
@@ -216,10 +216,9 @@ void calc_load_exit_idle(void)
static long calc_load_fold_idle(void)
{
int idx = calc_load_read_idx();
- long delta = 0;
+ long delta;

- if (atomic_long_read(&calc_load_idle[idx]))
- delta = atomic_long_xchg(&calc_load_idle[idx], 0);
+ delta = atomic_long_xchg(&calc_load_idle[idx], 0);

return delta;
}
--
2.6.3
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