[PATCH v5 9/9] task_isolation: kick_all_cpus_sync: don't kick isolated cpus

[Alex Belits <abelits@xxxxxxxxxxx>]

From: Yuri Norov <ynorov@xxxxxxxxxxx>

Make sure that kick_all_cpus_sync() does not call CPUs that are running
isolated tasks.

Signed-off-by: Yuri Norov <ynorov@xxxxxxxxxxx>
[abelits@xxxxxxxxxxx: use safe task_isolation_cpumask() implementation]
Signed-off-by: Alex Belits <abelits@xxxxxxxxxxx>
---
 kernel/smp.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 4d17501433be..b2faecf58ed0 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -932,9 +932,21 @@ static void do_nothing(void *unused)
  */
 void kick_all_cpus_sync(void)
 {
+	struct cpumask mask;
+
 	/* Make sure the change is visible before we kick the cpus */
 	smp_mb();
-	smp_call_function(do_nothing, NULL, 1);
+
+	preempt_disable();
+#ifdef CONFIG_TASK_ISOLATION
+	cpumask_clear(&mask);
+	task_isolation_cpumask(&mask);
+	cpumask_complement(&mask, &mask);
+#else
+	cpumask_setall(&mask);
+#endif
+	smp_call_function_many(&mask, do_nothing, NULL, 1);
+	preempt_enable();
 }
 EXPORT_SYMBOL_GPL(kick_all_cpus_sync);
 
-- 
2.20.1