[PATCH v5 9/9] task_isolation: kick_all_cpus_sync: don't kick isolated cpus
From: Alex Belits <hidden>
Date: 2020-11-23 17:59:20
Also in:
linux-api, linux-arch, linux-arm-kernel, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Yuri Norov <redacted> Make sure that kick_all_cpus_sync() does not call CPUs that are running isolated tasks. Signed-off-by: Yuri Norov <redacted> [abelits@marvell.com: use safe task_isolation_cpumask() implementation] Signed-off-by: Alex Belits <redacted> --- 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