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

[Alex Belits]

From: Yuri Norov <yno...@marvell.com>

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

Signed-off-by: Yuri Norov <yno...@marvell.com>
[abel...@marvell.com: use safe task_isolation_cpumask() implementation]
Signed-off-by: Alex Belits <abel...@marvell.com>
---
 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