The warned bitfields in struct scx_sched are updated racily from concurrent
CPUs causing RMW races, which is fine for these boolean warning flags. Add a
comment marking this area to prevent future fields that can't tolerate racy
updates from being added here.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
kernel/sched/ext_internal.h | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/sched/ext_internal.h
+++ b/kernel/sched/ext_internal.h
@@ -895,6 +895,10 @@ struct scx_sched {
struct scx_dispatch_q **global_dsqs;
struct scx_sched_pcpu __percpu *pcpu;
+ /*
+ * Updates to the following warned bitfields can race causing RMW issues
+ * but it doesn't really matter.
+ */
bool warned_zero_slice:1;
bool warned_deprecated_rq:1;