From: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
commit c245910049d04fbfa85bb2f5acd591c24e9907c7 upstream.
Paths using put_prev_task_balance() need to do a pick shortly
after. Make sure they also clear the ->dl_server on prev as a
part of that.
Fixes: 63ba8422f876 ("sched/deadline: Introduce deadline servers")
Signed-off-by: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/d184d554434bedbad0581cb34656582d78655150.1716811044.git.bristot@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5789,6 +5789,14 @@ static void put_prev_task_balance(struct
#endif
put_prev_task(rq, prev);
+
+ /*
+ * We've updated @prev and no longer need the server link, clear it.
+ * Must be done before ->pick_next_task() because that can (re)set
+ * ->dl_server.
+ */
+ if (prev->dl_server)
+ prev->dl_server = NULL;
}
/*
@@ -5832,14 +5840,6 @@ __pick_next_task(struct rq *rq, struct t
restart:
put_prev_task_balance(rq, prev, rf);
- /*
- * We've updated @prev and no longer need the server link, clear it.
- * Must be done before ->pick_next_task() because that can (re)set
- * ->dl_server.
- */
- if (prev->dl_server)
- prev->dl_server = NULL;
-
for_each_class(class) {
p = class->pick_next_task(rq);
if (p)
Patches currently in stable-queue which might be from joel@xxxxxxxxxxxxxxxxx are
queue-6.11/sched-core-add-clearing-of-dl_server-in-put_prev_task_balance.patch
