diff mbox series

[v3,12/13] task_isolation: kick_all_cpus_sync: don't kick isolated cpus

Message ID 9da10e7fdfae23fe397852d40101e8db1f1faf07.camel@marvell.com
State Not Applicable
Delegated to: David Miller
Headers show
Series [01/13] task_isolation: vmstat: add quiet_vmstat_sync function | expand

Commit Message

Alex Belits April 9, 2020, 3:27 p.m. UTC 
From: Yuri Norov <ynorov@marvell.com>

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

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

Patch

diff --git a/kernel/smp.c b/kernel/smp.c
index 3a8bcbdd4ce6..d9b4b2fedfed 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -731,9 +731,21 @@  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);