Commit-ID: 3261ed0b25098f92d36d5ad14524254d8c7fba54
Gitweb: http://git.kernel.org/tip/3261ed0b25098f92d36d5ad14524254d8c7fba54
Author: Byungchul Park <byungchul.park@xxxxxxx>
AuthorDate: Tue, 23 May 2017 11:00:57 +0900
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 10 Aug 2017 12:18:17 +0200
sched/deadline: Change return value of cpudl_find()
cpudl_find() users are only interested in knowing if suitable CPU(s)
were found or not (and then they look at later_mask to know which).
Change cpudl_find() return type accordingly. Aligns with rt code.
Signed-off-by: Byungchul Park <byungchul.park@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: <bristot@xxxxxxxxxx>
Cc: <juri.lelli@xxxxxxxxx>
Cc: <kernel-team@xxxxxxx>
Cc: <rostedt@xxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1495504859-10960-3-git-send-email-byungchul.park@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/cpudeadline.c | 26 +++++++++++++-------------
kernel/sched/deadline.c | 6 +++---
2 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index bdf448b..8d9562d 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -119,29 +119,29 @@ static inline int cpudl_maximum(struct cpudl *cp)
* @p: the task
* @later_mask: a mask to fill in with the selected CPUs (or NULL)
*
- * Returns: int - best CPU (heap maximum if suitable)
+ * Returns: int - CPUs were found
*/
int cpudl_find(struct cpudl *cp, struct task_struct *p,
struct cpumask *later_mask)
{
- int best_cpu = -1;
const struct sched_dl_entity *dl_se = &p->dl;
if (later_mask &&
cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) {
- best_cpu = cpumask_any(later_mask);
- goto out;
- } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) &&
- dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
- best_cpu = cpudl_maximum(cp);
- if (later_mask)
- cpumask_set_cpu(best_cpu, later_mask);
- }
+ return 1;
+ } else {
+ int best_cpu = cpudl_maximum(cp);
+ WARN_ON(best_cpu != -1 && !cpu_present(best_cpu));
-out:
- WARN_ON(best_cpu != -1 && !cpu_present(best_cpu));
+ if (cpumask_test_cpu(best_cpu, &p->cpus_allowed) &&
+ dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
+ if (later_mask)
+ cpumask_set_cpu(best_cpu, later_mask);
- return best_cpu;
+ return 1;
+ }
+ }
+ return 0;
}
/*
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index ac07d7c..d05bd94 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1594,7 +1594,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
* let's hope p can move out.
*/
if (rq->curr->nr_cpus_allowed == 1 ||
- cpudl_find(&rq->rd->cpudl, rq->curr, NULL) == -1)
+ !cpudl_find(&rq->rd->cpudl, rq->curr, NULL))
return;
/*
@@ -1602,7 +1602,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
* see if it is pushed or pulled somewhere else.
*/
if (p->nr_cpus_allowed != 1 &&
- cpudl_find(&rq->rd->cpudl, p, NULL) != -1)
+ cpudl_find(&rq->rd->cpudl, p, NULL))
return;
resched_curr(rq);
@@ -1811,7 +1811,7 @@ static int find_later_rq(struct task_struct *task)
* We have to consider system topology and task affinity
* first, then we can look for a suitable cpu.
*/
- if (cpudl_find(&task_rq(task)->rd->cpudl, task, later_mask) == -1)
+ if (!cpudl_find(&task_rq(task)->rd->cpudl, task, later_mask))
return -1;
/*
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|