[PATCH 25/46] sched, lto: mark sched classes as __noreorder

[Jiri Slaby (SUSE)]

From: Andi Kleen <andi@xxxxxxxxxxxxxx>

The scheduler code assumes that the scheduler classes are in a
particular order in memory. gcc LTO can violate this. Specify
__noreorder to avoid a boot BUG().

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Valentin Schneider <vschneid@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Martin Liska <mliska@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 kernel/sched/sched.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index a4a20046e586..fe2703528972 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2230,6 +2230,7 @@ static inline void set_next_task(struct rq *rq, struct task_struct *next)
  */
 #define DEFINE_SCHED_CLASS(name) \
 const struct sched_class name##_sched_class \
+	__noreorder \
 	__aligned(__alignof__(struct sched_class)) \
 	__section("__" #name "_sched_class")
 
-- 
2.38.1