workqueue: jumps to use_dfl_pwq if the target cpumask is equal wq's
PATCH v2 1/1 workqueue: jumps to use_dfl_pwq if the target cpumask is equal wq's
wq_update_unbound_numa(), when it's decided that the newly updated cpumask equals the default, looks at whether the current pwq is already the default one and skips setting pwq to the default one. This extra step is unnecessary and we can always jump to use_dfl_pwq instead. Simplify the code by removing the conditional. This doesn't make any functional difference.
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V2: update patch description and comment of code
kernel/workqueue.c | 8 ++------ 1 files changed, 2 insertions(+), 6 deletions(-)
kernel/workqueue.c +2 -6
@@ -4080,17 +4080,13 @@ static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,* Let's determine what needs to be done. If the target cpumask is * different from wq's, we need to compare it to @pwq's and create * a new one if they don't match. If the target cpumask equals -* wq's, the default pwq should be used. If @pwq is already the -* default one, nothing to do; otherwise, install the default one. +* wq's, the default pwq should be used. */ if (wq_calc_node_cpumask (wq->unbound_attrs, node, cpu_off, cpumask)) {if (cpumask_equal (cpumask, pwq->pool->attrs->cpumask)) goto out_unlock; }else { -if (pwq == wq->dfl_pwq) - goto out_unlock; -else - goto use_dfl_pwq; + goto use_dfl_pwq; }mutex_unlock (&wq->mutex);
Signature · 1 line
1.7.4.4
Quoted 8 lines · Daeseok Youn
wq_update_unbound_numa(), when it's decided that the newly updated cpumask equals the default, looks at whether the current pwq is already the default one and skips setting pwq to the default one. This extra step is unnecessary and we can always jump touse_dfl_pwqinstead. Simplify the code by removing the conditional. This doesn't make any functional difference.Signed-off-by Daeseok Youn <[email protected]>
Applied to wq/for-3.16 w/ minor update to the patch title.
Thanks.
Signature · 1 line
tejun