6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Youssef Esmat <youssefesmat@xxxxxxxxxx>
commit a741b82423f41501e301eb6f9820b45ca202e877 upstream.
In case the previous pick was a DL server pick, ->dl_server might be
set. Clear it in the fast path as well.
Fixes: 63ba8422f876 ("sched/deadline: Introduce deadline servers")
Signed-off-by: Youssef Esmat <youssefesmat@xxxxxxxxxx>
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/7f7381ccba09efcb4a1c1ff808ed58385eccc222.1716811044.git.bristot@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5828,6 +5828,13 @@ __pick_next_task(struct rq *rq, struct t
}
/*
+ * This is a normal CFS pick, but the previous could be a DL pick.
+ * Clear it as previous is no longer picked.
+ */
+ if (prev->dl_server)
+ prev->dl_server = NULL;
+
+ /*
* This is the fast path; it cannot be a DL server pick;
* therefore even if @p == @prev, ->dl_server must be NULL.
*/
